smart-contracts | Main smart contracts for Kyber Network | Cryptocurrency library

by KyberNetwork JavaScript Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | smart-contracts Summary

smart-contracts is a JavaScript library typically used in Blockchain, Cryptocurrency, Ethereum applications. smart-contracts has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

This repository contains kyber network smart contracts. For more details, please visit our developer portal.

Support

Quality

Security

License

Reuse

Support

Quality

Security

License

Reuse

Support

smart-contracts has a low active ecosystem.

It has 363 star(s) with 209 fork(s). There are 34 watchers for this library.

It had no major release in the last 6 months.

There are 23 open issues and 105 have been closed. On average issues are closed in 260 days. There are 21 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of smart-contracts is current.

smart-contracts Support

Best in #Cryptocurrency

Average in #Cryptocurrency

smart-contracts Support

Best in #Cryptocurrency

Average in #Cryptocurrency

Quality

smart-contracts has 0 bugs and 0 code smells.

smart-contracts Quality

Best in #Cryptocurrency

Average in #Cryptocurrency

smart-contracts Quality

Best in #Cryptocurrency

Average in #Cryptocurrency

Security

smart-contracts has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

smart-contracts code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

smart-contracts Security

Best in #Cryptocurrency

Average in #Cryptocurrency

smart-contracts Security

Best in #Cryptocurrency

Average in #Cryptocurrency

License

smart-contracts is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

smart-contracts License

Best in #Cryptocurrency

Average in #Cryptocurrency

smart-contracts License

Best in #Cryptocurrency

Average in #Cryptocurrency

Reuse

smart-contracts releases are not available. You will need to build from source code and install.

Installation instructions are available. Examples and code snippets are not available.

smart-contracts saves you 89 person hours of effort in developing the same functionality from scratch.

It has 229 lines of code, 8 functions and 113 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

smart-contracts Reuse

Best in #Cryptocurrency

Average in #Cryptocurrency

smart-contracts Reuse

Best in #Cryptocurrency

Average in #Cryptocurrency

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smart-contracts Key Features

Main smart contracts for Kyber Network, including the main platform contract, reserve contracts etc.

smart-contracts Examples and Code Snippets

No Code Snippets are available at this moment for smart-contracts.

Community Discussions

Trending Discussions on smart-contracts

Parsing a nested json using gson

JAVA how to convert JSONObject into a custom format?

Example for addLiquidity method of UniswapV2 Router

Pancakeswap router v2 - getAmountsOut?

Parse JSON with known variable field

Chainlink Request Event Emit - Unsure whether events are being emitted, requests seem to be sucessful

How to extract 'name' from class 'coinmarketcapapi.Response'?

Why would you delete the access keys to your NEAR account containing a smart contract?

Listening to Uniswap contract events using web3.py and infura.io

Cant get TRON contract ABI from Trongrid

Trending Discussions on smart-contracts

Parsing a nested json using gson

JAVA how to convert JSONObject into a custom format?

Example for addLiquidity method of UniswapV2 Router

Pancakeswap router v2 - getAmountsOut?

Parse JSON with known variable field

Chainlink Request Event Emit - Unsure whether events are being emitted, requests seem to be sucessful

How to extract 'name' from class 'coinmarketcapapi.Response'?

Why would you delete the access keys to your NEAR account containing a smart contract?

Listening to Uniswap contract events using web3.py and infura.io

Cant get TRON contract ABI from Trongrid

QUESTION

Parsing a nested json using gson

Asked 2022-Mar-05 at 16:26

What I am trying to do is to parse nested json data into a Java object using Gson and print it out with customized toString().

The Json Content

{"data": [
    {
        "symbol": "BTC",
        "circulating_supply": 18975050,
        "last_updated": "2022-03-05T13:54:00.000Z",
        "total_supply": 18975050,
        "cmc_rank": 1,
        "self_reported_circulating_supply": null,
        "platform": null,
        "tags": [
            "mineable",
            "pow",
            "sha-256",
            "store-of-value",
            "state-channel",
            "coinbase-ventures-portfolio",
            "three-arrows-capital-portfolio",
            "polychain-capital-portfolio",
            "binance-labs-portfolio",
            "blockchain-capital-portfolio",
            "boostvc-portfolio",
            "cms-holdings-portfolio",
            "dcg-portfolio",
            "dragonfly-capital-portfolio",
            "electric-capital-portfolio",
            "fabric-ventures-portfolio",
            "framework-ventures-portfolio",
            "galaxy-digital-portfolio",
            "huobi-capital-portfolio",
            "alameda-research-portfolio",
            "a16z-portfolio",
            "1confirmation-portfolio",
            "winklevoss-capital-portfolio",
            "usv-portfolio",
            "placeholder-ventures-portfolio",
            "pantera-capital-portfolio",
            "multicoin-capital-portfolio",
            "paradigm-portfolio"
        ],
        "date_added": "2013-04-28T00:00:00.000Z",
        "quote": {"USD": {
            "fully_diluted_market_cap": 820131199762.62,
            "last_updated": "2022-03-05T13:54:00.000Z",
            "market_cap_dominance": 42.252,
            "percent_change_30d": 6.81621153,
            "percent_change_1h": -0.42008562,
            "percent_change_24h": -5.71623656,
            "market_cap": 741049072478.8419,
            "volume_change_24h": -11.0241,
            "price": 39053.8666553628,
            "percent_change_60d": -16.6843952,
            "volume_24h": 26123993408.855915,
            "percent_change_90d": -21.03603335,
            "percent_change_7d": -0.10097865
        }},
        "num_market_pairs": 9214,
        "name": "Bitcoin",
        "max_supply": 21000000,
        "id": 1,
        "self_reported_market_cap": null,
        "slug": "bitcoin"
    },
    {
        "symbol": "ETH",
        "circulating_supply": 119834013.5615,
        "last_updated": "2022-03-05T13:54:00.000Z",
        "total_supply": 119834013.5615,
        "cmc_rank": 2,
        "self_reported_circulating_supply": null,
        "platform": null,
        "tags": [
            "mineable",
            "pow",
            "smart-contracts",
            "ethereum-ecosystem",
            "coinbase-ventures-portfolio",
            "three-arrows-capital-portfolio",
            "polychain-capital-portfolio",
            "binance-labs-portfolio",
            "blockchain-capital-portfolio",
            "boostvc-portfolio",
            "cms-holdings-portfolio",
            "dcg-portfolio",
            "dragonfly-capital-portfolio",
            "electric-capital-portfolio",
            "fabric-ventures-portfolio",
            "framework-ventures-portfolio",
            "hashkey-capital-portfolio",
            "kenetic-capital-portfolio",
            "huobi-capital-portfolio",
            "alameda-research-portfolio",
            "a16z-portfolio",
            "1confirmation-portfolio",
            "winklevoss-capital-portfolio",
            "usv-portfolio",
            "placeholder-ventures-portfolio",
            "pantera-capital-portfolio",
            "multicoin-capital-portfolio",
            "paradigm-portfolio",
            "injective-ecosystem",
            "bnb-chain"
        ],
        "date_added": "2015-08-07T00:00:00.000Z",
        "quote": {"USD": {
            "fully_diluted_market_cap": 316405371023.81,
            "last_updated": "2022-03-05T13:54:00.000Z",
            "market_cap_dominance": 18.0363,
            "percent_change_30d": 1.39750424,
            "percent_change_1h": -0.82066438,
            "percent_change_24h": -3.20839994,
            "market_cap": 316405371023.81366,
            "volume_change_24h": -14.3764,
            "price": 2640.363629825611,
            "percent_change_60d": -31.31982292,
            "volume_24h": 12406258074.91051,
            "percent_change_90d": -37.45316954,
            "percent_change_7d": -4.71064229
        }},
        "num_market_pairs": 5543,
        "name": "Ethereum",
        "max_supply": null,
        "id": 1027,
        "self_reported_market_cap": null,
        "slug": "ethereum"
    },
 and so on...
]}

POJO Classes : Example

package controller;

import java.util.List;
import javax.annotation.processing.Generated;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("jsonschema2pojo")
public class Example {

    @SerializedName("data")
    @Expose
    private List data = null;

    public List getData() {
        return data;
    }

    public void setData(List data) {
        this.data = data;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(Example.class.getName()).append('@').append(Integer.toHexString(System.identityHashCode(this))).append('[');
        sb.append("data");
        sb.append('=');
        sb.append(((this.data == null)?"":this.data));
        sb.append(',');
        if (sb.charAt((sb.length()- 1)) == ',') {
            sb.setCharAt((sb.length()- 1), ']');
        } else {
            sb.append(']');
        }
        return sb.toString();
    }

}

POJO Classes : JsonFormatter

package controller;


import java.util.List;
import javax.annotation.processing.Generated;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("jsonschema2pojo")
public class JsonFormatter {

    @SerializedName("symbol")
    @Expose
    private String symbol;
    @SerializedName("circulating_supply")
    @Expose
    private Float circulatingSupply;
    @SerializedName("last_updated")
    @Expose
    private String lastUpdated;
    @SerializedName("total_supply")
    @Expose
    private Float totalSupply;
    @SerializedName("cmc_rank")
    @Expose
    private Float cmcRank;
    @SerializedName("self_reported_circulating_supply")
    @Expose
    private Object selfReportedCirculatingSupply;
    @SerializedName("platform")
    @Expose
    private Platform platform;
    @SerializedName("tags")
    @Expose
    private List tags = null;
    @SerializedName("date_added")
    @Expose
    private String dateAdded;
    @SerializedName("quote")
    @Expose
    private Quote quote;
    @SerializedName("num_market_pairs")
    @Expose
    private Float numMarketPairs;
    @SerializedName("name")
    @Expose
    private String name;
    @SerializedName("max_supply")
    @Expose
    private Float maxSupply;
    @SerializedName("id")
    @Expose
    private Integer id;
    @SerializedName("self_reported_market_cap")
    @Expose
    private Object selfReportedMarketCap;
    @SerializedName("slug")
    @Expose
    private String slug;

    public String getSymbol() {
        return symbol;
    }

    public void setSymbol(String symbol) {
        this.symbol = symbol;
    }

    public Float getCirculatingSupply() {
        return circulatingSupply;
    }

    public void setCirculatingSupply(Float circulatingSupply) {
        this.circulatingSupply = circulatingSupply;
    }

    public String getLastUpdated() {
        return lastUpdated;
    }

    public void setLastUpdated(String lastUpdated) {
        this.lastUpdated = lastUpdated;
    }

    public Float getTotalSupply() {
        return totalSupply;
    }

    public void setTotalSupply(Float totalSupply) {
        this.totalSupply = totalSupply;
    }

    public Float getCmcRank() {
        return cmcRank;
    }

    public void setCmcRank(Float cmcRank) {
        this.cmcRank = cmcRank;
    }

    public Object getSelfReportedCirculatingSupply() {
        return selfReportedCirculatingSupply;
    }

    public void setSelfReportedCirculatingSupply(Object selfReportedCirculatingSupply) {
        this.selfReportedCirculatingSupply = selfReportedCirculatingSupply;
    }

    public Platform getPlatform() {
        return platform;
    }

    public void setPlatform(Platform platform) {
        this.platform = platform;
    }

    public List getTags() {
        return tags;
    }

    public void setTags(List tags) {
        this.tags = tags;
    }

    public String getDateAdded() {
        return dateAdded;
    }

    public void setDateAdded(String dateAdded) {
        this.dateAdded = dateAdded;
    }

    public Quote getQuote() {
        return quote;
    }

    public void setQuote(Quote quote) {
        this.quote = quote;
    }

    public Float getNumMarketPairs() {
        return numMarketPairs;
    }

    public void setNumMarketPairs(Float numMarketPairs) {
        this.numMarketPairs = numMarketPairs;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Float getMaxSupply() {
        return maxSupply;
    }

    public void setMaxSupply(Float maxSupply) {
        this.maxSupply = maxSupply;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Object getSelfReportedMarketCap() {
        return selfReportedMarketCap;
    }

    public void setSelfReportedMarketCap(Object selfReportedMarketCap) {
        this.selfReportedMarketCap = selfReportedMarketCap;
    }

    public String getSlug() {
        return slug;
    }

    public void setSlug(String slug) {
        this.slug = slug;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(JsonFormatter.class.getName()).append('@').append(Integer.toHexString(System.identityHashCode(this))).append('[');
        sb.append("symbol");
        sb.append('=');
        sb.append(((this.symbol == null)?"":this.symbol));
        sb.append(',');
        sb.append("circulatingSupply");
        sb.append('=');
        sb.append(((this.circulatingSupply == null)?"":this.circulatingSupply));
        sb.append(',');
        sb.append("lastUpdated");
        sb.append('=');
        sb.append(((this.lastUpdated == null)?"":this.lastUpdated));
        sb.append(',');
        sb.append("totalSupply");
        sb.append('=');
        sb.append(((this.totalSupply == null)?"":this.totalSupply));
        sb.append(',');
        sb.append("cmcRank");
        sb.append('=');
        sb.append(((this.cmcRank == null)?"":this.cmcRank));
        sb.append(',');
        sb.append("selfReportedCirculatingSupply");
        sb.append('=');
        sb.append(((this.selfReportedCirculatingSupply == null)?"":this.selfReportedCirculatingSupply));
        sb.append(',');
        sb.append("platform");
        sb.append('=');
        sb.append(((this.platform == null)?"":this.platform));
        sb.append(',');
        sb.append("tags");
        sb.append('=');
        sb.append(((this.tags == null)?"":this.tags));
        sb.append(',');
        sb.append("dateAdded");
        sb.append('=');
        sb.append(((this.dateAdded == null)?"":this.dateAdded));
        sb.append(',');
        sb.append("quote");
        sb.append('=');
        sb.append(((this.quote == null)?"":this.quote));
        sb.append(',');
        sb.append("numMarketPairs");
        sb.append('=');
        sb.append(((this.numMarketPairs == null)?"":this.numMarketPairs));
        sb.append(',');
        sb.append("name");
        sb.append('=');
        sb.append(((this.name == null)?"":this.name));
        sb.append(',');
        sb.append("maxSupply");
        sb.append('=');
        sb.append(((this.maxSupply == null)?"":this.maxSupply));
        sb.append(',');
        sb.append("id");
        sb.append('=');
        sb.append(((this.id == null)?"":this.id));
        sb.append(',');
        sb.append("selfReportedMarketCap");
        sb.append('=');
        sb.append(((this.selfReportedMarketCap == null)?"":this.selfReportedMarketCap));
        sb.append(',');
        sb.append("slug");
        sb.append('=');
        sb.append(((this.slug == null)?"":this.slug));
        sb.append(',');
        if (sb.charAt((sb.length()- 1)) == ',') {
            sb.setCharAt((sb.length()- 1), ']');
        } else {
            sb.append(']');
        }
        return sb.toString();
    }

}

There are also other classes for my POJO, and the way I tried to parse it into Gson is :

Gson gson = new Gson();
Type type = new TypeToken>>() {}.getType();
Map> nodeProperties = gson.fromJson(json.toString(), type);

but when I try to print out its sub values like

for (Map.Entry> set : nodeProperties.entrySet()) {
            System.out.println(set.getValue().get(0).getData().get(0).toString());
        }

I get the error :

class controller.JsonFormatter cannot be cast to class controller.Example (controller.JsonFormatter and controller.Example are in unnamed module of loader 'app')

What I want to achieve is to print the above json content as like this:

Symbol: BTC
Circulating_supply: 18975050
...
Tags:
    mineable

Can anyone please help me out to solve this problem? Thanks in advance!

ANSWER

Answered 2022-Mar-05 at 16:26

The issue is in these lines:

Type type = new TypeToken>>() {}.getType();
Map> nodeProperties = gson.fromJson(json.toString(), type);

The TypeToken is for MapJsonFormatter>>, but you store the parsed JSON in a variable of type MapExample>>. Unfortunately Gson.fromJson(..., Type) does not provide any type safety guarantees, therefore you must make sure that the provided Type matches the type of the variable you store the result in. Additionally due to Java's type erasure at runtime, you do not notice this JsonFormatter vs. Example mismatch until you iterate over the elements, causing the ClassCastException.

Based on the JSON data you provided, it looks to me like you could just use gson.fromJson(json.toString(), Example.class), but please verify whether that is actually correct for your use case.

Source https://stackoverflow.com/questions/71362843

QUESTION

JAVA how to convert JSONObject into a custom format?

Asked 2022-Mar-02 at 18:45

What I am trying to do is to change a certain JSON file into a custom format, and I have been searching for the information for two days but I haven't figured it out and I have no one to ask about this....

Before Formatting

{
   "book": [

      {
         "id": "01",
         "language": "Java",
         "edition": "third",
         "author": "Herbert Schildt"
      },

      {
         "id": "07",
         "language": "C++",
         "edition": "second",
         "author": "E.Balagurusamy"
      }

   ]
}

Trying to format it into:

Book
      Id : 01
      Language : Java
      ...

      Id : 07
      Language : C++

The actual JSON data is like this:

[
    {
        "symbol": "BTC",
        "circulating_supply": 18729837,
        "last_updated": "2021-06-08T10:17:02.000Z",
        "total_supply": 18729837,
        "cmc_rank": 1,
        "platform": null,
        "tags": [
            "mineable",
            "pow",
            "sha-256",
            "store-of-value",
            "state-channels",
            "coinbase-ventures-portfolio",
            "three-arrows-capital-portfolio",
            "polychain-capital-portfolio",
            "binance-labs-portfolio",
            "arrington-xrp-capital",
            "blockchain-capital-portfolio",
            "boostvc-portfolio",
            "cms-holdings-portfolio",
            "dcg-portfolio",
            "dragonfly-capital-portfolio",
            "electric-capital-portfolio",
            "fabric-ventures-portfolio",
            "framework-ventures",
            "galaxy-digital-portfolio",
            "huobi-capital",
            "alameda-research-portfolio",
            "a16z-portfolio",
            "1confirmation-portfolio",
            "winklevoss-capital",
            "usv-portfolio",
            "placeholder-ventures-portfolio",
            "pantera-capital-portfolio",
            "multicoin-capital-portfolio",
            "paradigm-xzy-screener"
        ],
        "date_added": "2013-04-28T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -42.63012856,
            "percent_change_1h": 0.38317977,
            "last_updated": "2021-06-08T10:17:02.000Z",
            "percent_change_24h": -9.36685756,
            "market_cap": 619325019564.578,
            "price": 33066.22580669431,
            "percent_change_60d": -43.54639481,
            "volume_24h": 43132365330.36409,
            "percent_change_90d": -39.86303315,
            "percent_change_7d": -9.21607228
        }},
        "num_market_pairs": 9722,
        "name": "Bitcoin",
        "max_supply": 21000000,
        "id": 1,
        "slug": "bitcoin"
    },
    {
        "symbol": "ETH",
        "circulating_supply": 116205430.624,
        "last_updated": "2021-06-08T10:17:02.000Z",
        "total_supply": 116205430.624,
        "cmc_rank": 2,
        "platform": null,
        "tags": [
            "mineable",
            "pow",
            "smart-contracts",
            "ethereum",
            "coinbase-ventures-portfolio",
            "three-arrows-capital-portfolio",
            "polychain-capital-portfolio",
            "binance-labs-portfolio",
            "arrington-xrp-capital",
            "blockchain-capital-portfolio",
            "boostvc-portfolio",
            "cms-holdings-portfolio",
            "dcg-portfolio",
            "dragonfly-capital-portfolio",
            "electric-capital-portfolio",
            "fabric-ventures-portfolio",
            "framework-ventures",
            "hashkey-capital-portfolio",
            "kinetic-capital",
            "huobi-capital",
            "alameda-research-portfolio",
            "a16z-portfolio",
            "1confirmation-portfolio",
            "winklevoss-capital",
            "usv-portfolio",
            "placeholder-ventures-portfolio",
            "pantera-capital-portfolio",
            "multicoin-capital-portfolio",
            "paradigm-xzy-screener"
        ],
        "date_added": "2015-08-07T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -34.93326351,
            "percent_change_1h": 0.0977492,
            "last_updated": "2021-06-08T10:17:02.000Z",
            "percent_change_24h": -10.67415695,
            "market_cap": 292465567141.6079,
            "price": 2516.797756964766,
            "percent_change_60d": 20.00514111,
            "volume_24h": 38463882117.94565,
            "percent_change_90d": 37.73403958,
            "percent_change_7d": -3.05561192
        }},
        "num_market_pairs": 6053,
        "name": "Ethereum",
        "max_supply": null,
        "id": 1027,
        "slug": "ethereum"
    },
    {
        "symbol": "USDT",
        "circulating_supply": 62280355385.45168,
        "last_updated": "2021-06-08T10:16:08.000Z",
        "total_supply": 64471767616.826355,
        "cmc_rank": 3,
        "platform": {
            "symbol": "ETH",
            "name": "Ethereum",
            "token_address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
            "id": 1027,
            "slug": "ethereum"
        },
        "tags": [
            "store-of-value",
            "payments",
            "stablecoin",
            "stablecoin-asset-backed",
            "solana-ecosystem"
        ],
        "date_added": "2015-02-25T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": 0.08689942,
            "percent_change_1h": -0.01514305,
            "last_updated": "2021-06-08T10:16:08.000Z",
            "percent_change_24h": 0.00252658,
            "market_cap": 62333503909.90704,
            "price": 1.00085337542033,
            "percent_change_60d": 0.00890571,
            "volume_24h": 88090197454.22122,
            "percent_change_90d": 0.02421796,
            "percent_change_7d": 0.03190558
        }},
        "num_market_pairs": 13483,
        "name": "Tether",
        "max_supply": null,
        "id": 825,
        "slug": "tether"
    },
    {
        "symbol": "BNB",
        "circulating_supply": 153432897,
        "last_updated": "2021-06-08T10:17:08.000Z",
        "total_supply": 169432897,
        "cmc_rank": 4,
        "platform": null,
        "tags": [
            "marketplace",
            "centralized-exchange",
            "payments",
            "binance-smart-chain",
            "alameda-research-portfolio",
            "multicoin-capital-portfolio"
        ],
        "date_added": "2017-07-25T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -46.98637267,
            "percent_change_1h": -0.06201527,
            "last_updated": "2021-06-08T10:17:08.000Z",
            "percent_change_24h": -12.9766759,
            "market_cap": 54032968135.19999,
            "price": 352.1602550149333,
            "percent_change_60d": -18.72766515,
            "volume_24h": 3975040241.706507,
            "percent_change_90d": 24.3131346,
            "percent_change_7d": 0.46465171
        }},
        "num_market_pairs": 619,
        "name": "Binance Coin",
        "max_supply": 170532785,
        "id": 1839,
        "slug": "binance-coin"
    },
    {
        "symbol": "ADA",
        "circulating_supply": 31930548128.29,
        "last_updated": "2021-06-08T10:16:09.000Z",
        "total_supply": 32681678108.601,
        "cmc_rank": 5,
        "platform": null,
        "tags": [
            "mineable",
            "dpos",
            "pos",
            "platform",
            "research",
            "smart-contracts",
            "staking",
            "binance-chain"
        ],
        "date_added": "2017-10-01T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -9.47981292,
            "percent_change_1h": -1.0109768,
            "last_updated": "2021-06-08T10:16:09.000Z",
            "percent_change_24h": -10.68780802,
            "market_cap": 49082262157.72255,
            "price": 1.53715689315826,
            "percent_change_60d": 26.8779134,
            "volume_24h": 3602351530.9447293,
            "percent_change_90d": 31.00161031,
            "percent_change_7d": -9.66192067
        }},
        "num_market_pairs": 276,
        "name": "Cardano",
        "max_supply": 45000000000,
        "id": 2010,
        "slug": "cardano"
    },
    {
        "symbol": "DOGE",
        "circulating_supply": 129939361256.40326,
        "last_updated": "2021-06-08T10:17:03.000Z",
        "total_supply": 129939361256.40326,
        "cmc_rank": 6,
        "platform": null,
        "tags": [
            "mineable",
            "pow",
            "scrypt",
            "medium-of-exchange",
            "memes",
            "payments"
        ],
        "date_added": "2013-12-15T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -27.85005369,
            "percent_change_1h": -0.39664229,
            "last_updated": "2021-06-08T10:17:03.000Z",
            "percent_change_24h": -12.06689716,
            "market_cap": 42746878864.849754,
            "price": 0.32897559639761,
            "percent_change_60d": 425.01053128,
            "volume_24h": 4256466078.3377676,
            "percent_change_90d": 479.75690549,
            "percent_change_7d": 1.48509162
        }},
        "num_market_pairs": 376,
        "name": "Dogecoin",
        "max_supply": null,
        "id": 74,
        "slug": "dogecoin"
    },
    {
        "symbol": "XRP",
        "circulating_supply": 46151013329,
        "last_updated": "2021-06-08T10:17:03.000Z",
        "total_supply": 99990399027,
        "cmc_rank": 7,
        "platform": null,
        "tags": [
            "medium-of-exchange",
            "enterprise-solutions",
            "binance-chain",
            "arrington-xrp-capital",
            "galaxy-digital-portfolio",
            "a16z-portfolio",
            "pantera-capital-portfolio"
        ],
        "date_added": "2013-08-04T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -42.92640139,
            "percent_change_1h": -0.60106842,
            "last_updated": "2021-06-08T10:17:03.000Z",
            "percent_change_24h": -10.12249253,
            "market_cap": 39897934998.12378,
            "price": 0.8645083199734,
            "percent_change_60d": -15.63161843,
            "volume_24h": 4179902561.947919,
            "percent_change_90d": 84.29141004,
            "percent_change_7d": -14.85218801
        }},
        "num_market_pairs": 682,
        "name": "XRP",
        "max_supply": 100000000000,
        "id": 52,
        "slug": "xrp"
    },
    {
        "symbol": "USDC",
        "circulating_supply": 23075185630.71199,
        "last_updated": "2021-06-08T10:17:04.000Z",
        "total_supply": 23075185630.71199,
        "cmc_rank": 8,
        "platform": {
            "symbol": "ETH",
            "name": "Ethereum",
            "token_address": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
            "id": 1027,
            "slug": "ethereum"
        },
        "tags": [
            "medium-of-exchange",
            "stablecoin",
            "stablecoin-asset-backed"
        ],
        "date_added": "2018-10-08T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": 0.05408204,
            "percent_change_1h": -0.00816775,
            "last_updated": "2021-06-08T10:17:04.000Z",
            "percent_change_24h": 0.00649147,
            "market_cap": 23084217521.810787,
            "price": 1.00039141141672,
            "percent_change_60d": -0.05832072,
            "volume_24h": 2455031484.812885,
            "percent_change_90d": 0.02446002,
            "percent_change_7d": -0.0056865
        }},
        "num_market_pairs": 1068,
        "name": "USD Coin",
        "max_supply": null,
        "id": 3408,
        "slug": "usd-coin"
    },
    {
        "symbol": "DOT",
        "circulating_supply": 945735752.6497443,
        "last_updated": "2021-06-08T10:17:05.000Z",
        "total_supply": 1081259867.5039322,
        "cmc_rank": 9,
        "platform": null,
        "tags": [
            "substrate",
            "polkadot",
            "binance-chain",
            "polkadot-ecosystem",
            "three-arrows-capital-portfolio",
            "polychain-capital-portfolio",
            "blockchain-capital-portfolio",
            "boostvc-portfolio",
            "cms-holdings-portfolio",
            "coinfund-portfolio",
            "fabric-ventures-portfolio",
            "fenbushi-capital-portfolio",
            "hashkey-capital-portfolio",
            "kinetic-capital",
            "1confirmation-portfolio",
            "placeholder-ventures-portfolio",
            "pantera-capital-portfolio",
            "exnetwork-capital-portfolio"
        ],
        "date_added": "2020-08-19T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -45.72649058,
            "percent_change_1h": -0.3486271,
            "last_updated": "2021-06-08T10:17:05.000Z",
            "percent_change_24h": -15.05195784,
            "market_cap": 20076748179.497543,
            "price": 21.22870804370766,
            "percent_change_60d": -48.77804479,
            "volume_24h": 2421158822.0532265,
            "percent_change_90d": -44.73258504,
            "percent_change_7d": -5.5027651
        }},
        "num_market_pairs": 202,
        "name": "Polkadot",
        "max_supply": null,
        "id": 6636,
        "slug": "polkadot-new"
    },
    {
        "symbol": "UNI",
        "circulating_supply": 575107764.052485,
        "last_updated": "2021-06-08T10:16:11.000Z",
        "total_supply": 1000000000,
        "cmc_rank": 10,
        "platform": {
            "symbol": "ETH",
            "name": "Ethereum",
            "token_address": "0x1f9840a85d5af5bf1d1762f925bdaddc4201f984",
            "id": 1027,
            "slug": "ethereum"
        },
        "tags": [
            "decentralized-exchange",
            "defi",
            "dao",
            "yield-farming",
            "amm",
            "coinbase-ventures-portfolio",
            "three-arrows-capital-portfolio",
            "governance",
            "blockchain-capital-portfolio",
            "defiance-capital",
            "alameda-research-portfolio",
            "a16z-portfolio",
            "pantera-capital-portfolio",
            "parafi-capital",
            "paradigm-xzy-screener"
        ],
        "date_added": "2020-09-17T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": -40.90238231,
            "percent_change_1h": -0.57439386,
            "last_updated": "2021-06-08T10:16:11.000Z",
            "percent_change_24h": -11.84522167,
            "market_cap": 13448377375.304375,
            "price": 23.38409984337659,
            "percent_change_60d": -23.21587997,
            "volume_24h": 569769688.2472888,
            "percent_change_90d": -26.98611642,
            "percent_change_7d": -13.63660968
        }},
        "num_market_pairs": 270,
        "name": "Uniswap",
        "max_supply": 1000000000,
        "id": 7083,
        "slug": "uniswap"
    },
    {
        "symbol": "ICP",
        "circulating_supply": 124103517.19,
        "last_updated": "2021-06-08T10:17:07.000Z",
        "total_supply": 469293126.8967923,
        "cmc_rank": 11,
        "platform": null,
        "tags": [
            "platform",
            "distributed-computing",
            "polychain-capital-portfolio",
            "exnetwork-capital-portfolio"
        ],
        "date_added": "2021-03-23T00:00:00.000Z",
        "quote": {"USD": {
            "percent_change_30d": 0,
            "percent_change_1h": -0.08952838,
            "last_updated": "2021-06-08T10:17:07.000Z",
            "percent_change_24h": -15.3124386,
            "market_cap": 10992912823.823347,
            "price": 88.57857595601757,
            "percent_change_60d": 0,
            "volume_24h": 260287850.43941185,
            "percent_change_90d": 0,
            "percent_change_7d": -20.06340267
        }},
        "num_market_pairs": 33,
        "name": "Internet Computer",
        "max_supply": null,
        "id": 8916,
        "slug": "internet-computer"
    },
... and so on
]

What I have been trying so far is to convert the JSONObject into a HashMap:

HashMap rs = new ObjectMapper().readValue(json.toString(), HashMap.class);

But I do not really know what to do now...

Someone told me to use Jackson or GSon or nested HashMap, but I don't know how it would solve the problem...

Can anyone please help me? Thanks in advance..!

ANSWER

Answered 2022-Mar-02 at 18:45

Don’t use a HashMap. Create real data classes:

public class Library {
    private Book[] book = { };

    public Book[] getBook() {
        return book;
    }

    public void setBook(Book[] books) {
        this.book = books;
    }
}

public class Book {
    private String id;
    private String language;
    private String edition;
    private String author;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getLanguage() {
        return language;
    }

    public void setLanguage(String language) {
        this.language = language;
    }

    public String getEdition() {
        return edition;
    }

    public void setEdition(String edition) {
        this.edition = edition;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}

Now you can pass Library.class instead of HashMap.class.

Source https://stackoverflow.com/questions/71325767

QUESTION

Example for addLiquidity method of UniswapV2 Router

Asked 2022-Feb-10 at 14:01

I am reading through UniswapV2 docs and can't understand the inputs of addLiquidity method properly. As listed in the docs:

amountAMin (uint): Bounds the extent to which the B/A price can go up before the transaction reverts. Must be <= amountADesired.

amountBMin (uint): Bounds the extent to which the A/B price can go up before the transaction reverts. Must be <= amountBDesired.

What does it mean? Can you please give an example? Let's say, I set amountADesired and amountBDesired to 4 and amountAMin and amountBMin to 1. What will happen?

ANSWER

Answered 2022-Feb-10 at 14:01

blockchain transactions are not immediate, but must queue before being mined on the blockchain and be effective

When you add liquidity given amountADesired you have to give it amountBDesired in proportion to the existing pair (example pair: 2:1 you have to put 2 tokens A and 1 token B)

once you send the transaction, before it is mined it may happen that others make operations on that liquidity pool, changing the proportion accordingly

by entering amountAmin and amountBmin you are practically telling him: "as long as the proportion is between amountADesired:amountBDesired and amountAMin:amountBmin accepts my liquidity addition, if instead the proportion exceeds my range, cancel my transaction"

Source https://stackoverflow.com/questions/71064601

QUESTION

Pancakeswap router v2 - getAmountsOut?

Asked 2021-Dec-05 at 20:10

What does getAmountsOut/getAmountOut and getAmountsIn/getAmountIn exactly do? There isn't an explanation in the Pancakeswap docs, so I'm not sure how could I use it. What's the difference between the two and with the 's' or none?

ANSWER

Answered 2021-Dec-05 at 20:10

The difference is that the one with the "s" return the series of outputs resulting from a path of swaps. Whereas the ones without the "s" return the output for a single swap.

So if I swap along the path ["ETHUSDT", "USDTUSDC"] then getAmountsOut will return the USDT output amount from the ETHUSDT swap and the USDC output amount from the "USDTUSDC" swap. The returned value will look like: [usdtAmount, usdcAmount].

If I swap "ETHUSDT" then getAmountOut will return usdtAmount.

The inverse is true for getAmountsIn/getAmountIn.

It's defined here: https://github.com/pancakeswap/pancake-swap-periphery/blob/master/contracts/libraries/PancakeLibrary.sol#L63

Source https://stackoverflow.com/questions/70199767

QUESTION

Parse JSON with known variable field

Asked 2021-Oct-24 at 21:50

I have a Haskell query function to get latest token price using

https://coinmarketcap.com/api/documentation/v1/#operation/getV1CryptocurrencyQuotesLatest

The function takes token id as arg, say 2010 for ADA.

import Data.Aeson
import Network.HTTP.Req

newtype Rate = Rate Double

query :: Int -> IO (Either Text Rate)
query tokenId = 
    let
        url = https queryPrefix /: "v1" /: "cryptocurrency" /: "quotes" /: "latest"
        idParam = "id" =: tokenId
        options = standardHeader <> idParam
    in
        runReq defaultHttpConfig $ do
            v <- req GET url NoReqBody jsonResponse options
            let responseCode = responseStatusCode v

            if isValidHttpResponse responseCode then do  
                case fromJSON $ responseBody v of
                    Success x -> pure $ Right x
                    Error e -> pure $ Left $ pack $ "Error decoding state: " <> e
            else
                pure $ Left $ pack ("Error with CoinMarketCap query 'Quotes Latest': " <> show responseCode <> ".  " <> show (responseStatusMessage v))

The Json output though has "2010" as a key:

{"status":
    {"timestamp":"2021-10-24T03:35:01.583Z","error_code":0,"error_message":null,"elapsed":163,"credit_count":1,"notice":null}
,"data":
    {"2010":
        {"id":2010
        ,"name":"Cardano"
        ,"symbol":"ADA"
        ,"slug":"cardano"
        ,"num_market_pairs":302,"date_added":"2017-10-01T00:00:00.000Z"
        ,"tags":["mineable","dpos","pos","platform","research","smart-contracts","staking","binance-smart-chain","cardano-ecosystem"]
        ,"max_supply":45000000000
        ,"circulating_supply":32904527668.666
        ,"total_supply":33250650235.236,"is_active":1
        ,"platform":null
        ,"cmc_rank":4
        ,"is_fiat":0
        ,"last_updated":"2021-10-24T03:33:31.000Z"
        ,"quote":
            {"USD":
                {"price":2.16109553945978
                ,"volume_24h":2048006882.386299
                ,"volume_change_24h":-24.06,"percent_change_1h":0.24896227
                ,"percent_change_24h":0.38920394
                ,"percent_change_7d":-0.97094597
                ,"percent_change_30d":-6.13245906
                ,"percent_change_60d":-21.94246757
                ,"percent_change_90d":63.56901345
                ,"market_cap":71109827972.785
                ,"market_cap_dominance":2.7813
                ,"fully_diluted_market_cap":97249299275.69,"last_updated":"2021-10-24T03:33:31.000Z"}}}}}

Being that 2010 is an arg to query, I clearly do not want to drill in as data.2010.quote.USD.price with something like this:

instance FromJSON Rate where
    parseJSON = withObject "Rate" $ \o -> do
        dataO  <- o .: "data"
        _2010O <- dataO .: "2010" -- #############
        quoteO <- _2010O .: "quote"
        usdO <- quoteO .: "USD"
        price <- usdO .: "price"
        
        pure $ Rate price

Question: How can I achieve the flexibility I want? Can I somehow pass in the token id to parseJSON? Or is there perhaps a Lens-Aeson technique to use a wildcard? ...

ANSWER

Answered 2021-Oct-24 at 16:12

I you are completely sure that the object inside "data" will only ever have a single key, we can take the object, convert it into a list of values, fail if the list is empty or has more than one value, and otherwise continue parsing. Like this:

instance FromJSON Rate where
    parseJSON = withObject "Rate" $ \o -> do
        Object dataO  <- o .: "data" -- we expect an Object
         -- get the single value, it should be an Object itself
        [Object _2010O] <- pure $ Data.Foldable.toList dataO
        quoteO <- _2010O .: "quote"
        usdO <- quoteO .: "USD"
        price <- usdO .: "price"
        pure $ Rate price

When there's no key, more than one key, or the value is not an aeson Object, the pattern [Object _2010O] <- fails to match and gives an parsing error through the MonadFail instance of aeson's Parser.

We could also be a bit more explicit:

instance FromJSON Rate where
    parseJSON = withObject "Rate" $ \o -> do
        Object dataO  <- o .: "data"
        let objects = Data.Foldable.toList dataO
        case objects of
            [Object _2010O] -> do
                quoteO <- _2010O .: "quote"
                usdO <- quoteO .: "USD"
                price <- usdO .: "price"
                pure $ Rate price  
            [_] -> fail "value is not Object"
            _ -> fail "zero or more than one key"

Source https://stackoverflow.com/questions/69694382

QUESTION

Chainlink Request Event Emit - Unsure whether events are being emitted, requests seem to be sucessful

Asked 2021-Oct-11 at 16:18

I am trying to learn how to use the ChainlinkClient and I am using their example as well as one for the API that I am trying to uses.

You can see them here on this Gist.

The two contracts in the Gist are deployed on Rinkenby here:

When I call the requestData() method on both contracts they seems to work, the transactions goes through and Link gets taken from the contracts, I am however unable to determine whether the actual data I am requesting from the external APIs gets returned, either by looking in the transaction event or trying to access the value that I am setting.

I am a bit bamboozled at this point, any guidance or suggestions would be greatly appreciated.

ANSWER

Answered 2021-Oct-11 at 16:18

Thanks for the flag. The node that was hosting this is deprecated, the article has been updated, and the docs have the latest example.

Please use:

oracle = 0xc57B33452b4F7BB189bB5AfaE9cc4aBa1f7a4FD8;
jobId = "d5270d1c311941d0b08bead21fea7747";

Source https://stackoverflow.com/questions/69503599

QUESTION

How to extract 'name' from class 'coinmarketcapapi.Response'?

Asked 2021-Apr-07 at 21:19

I am new to python/coding and I'm seeking some basic help to pull some elements from what I think is a dictionary. So I am executing the below.

print(data_quote)

Which returns this:

RESPONSE: 218ms OK: [{'id': 1, 'name': 'Bitcoin', 'symbol': 'BTC', 'slug': 'bitcoin', 'num_market_pairs': 9506, 'date_added': '2013-04-28T00:00:00.000Z', 'tags': ['mineable', 'pow', 'sha-256', 'store-of-value', 'state-channels', 'coinbase-ventures-portfolio', 'three-arrows-capital-portfolio', 'polychain-capital-portfolio', 'binance-labs-portfolio', 'arrington-xrp-capital', 'blockchain-capital-portfolio', 'boostvc-portfolio', 'cms-holdings-portfolio', 'dcg-portfolio', 'dragonfly-capital-portfolio', 'electric-capital-portfolio', 'fabric-ventures-portfolio', 'framework-ventures', 'galaxy-digital-portfolio', 'huobi-capital', 'alameda-research-portfolio', 'a16z-portfolio', '1confirmation-portfolio', 'winklevoss-capital', 'usv-portfolio', 'placeholder-ventures-portfolio', 'pantera-capital-portfolio', 'multicoin-capital-portfolio', 'paradigm-xzy-screener'], 'max_supply': 21000000, 'circulating_supply': 18675393, 'total_supply': 18675393, 'platform': None, 'cmc_rank': 1, 'last_updated': '2021-04-06T21:17:02.000Z', 'quote': {'USD': {'price': 58324.48252140573, 'volume_24h': 65699187936.697296, 'percent_change_1h': -0.11815165, 'percent_change_24h': -1.30799467, 'percent_change_7d': -0.86713748, 'percent_change_30d': 16.89536691, 'percent_change_60d': 55.08996724, 'percent_change_90d': 68.97932129, 'market_cap': 1089232632608.8828, 'last_updated': '2021-04-06T21:17:02.000Z'}}}, {'id': 1027, 'name': 'Ethereum', 'symbol': 'ETH', 'slug': 'ethereum', 'num_market_pairs': 6188, 'date_added': '2015-08-07T00:00:00.000Z', 'tags': ['mineable', 'pow', 'smart-contracts', 'ethereum', 'coinbase-ventures-portfolio', 'three-arrows-capital-portfolio', 'polychain-capital-portfolio', 'binance-labs-portfolio', 'arrington-xrp-capital', 'blockchain-capital-portfolio', 'boostvc-portfolio', 'cms-holdings-portfolio', 'dcg-portfolio', 'dragonfly-capital-portfolio', 'electric-capital-portfolio', 'fabric-ventures-portfolio', 'framework-ventures', 'hashkey-capital-portfolio', 'kinetic-capital', 'huobi-capital', 'alameda-research-portfolio', 'a16z-portfolio', '1confirmation-portfolio', 'winklevoss-capital', 'usv-portfolio', 'placeholder-ventures-portfolio', 'pantera-capital-portfolio', 'multicoin-capital-portfolio', 'paradigm-xzy-screener'], 'max_supply': None, 'circulating_supply': 115361642.1865, 'total_supply': 115361642.1865, 'platform': None, 'cmc_rank': 2, 'last_updated': '2021-04-06T21:17:02.000Z', 'quote': {'USD': {'price': 2120.1707443094906, 'volume_24h': 29172611149.352947, 'percent_change_1h': -0.1523387, 'percent_change_24h': 0.57727077, 'percent_change_7d': 14.76712255, 'percent_change_30d': 29.55009273, 'percent_change_60d': 24.5531557, 'percent_change_90d': 86.25530334, 'market_cap': 244586378779.31683, 'last_updated': '2021-04-06T21:17:02.000Z'}}}, {'id': 1839, 'name': 'Binance Coin', 'symbol': 'BNB', 'slug': 'binance-coin', 'num_market_pairs': 576, 'date_added': '2017-07-25T00:00:00.000Z', 'tags': ['marketplace', 'centralized-exchange', 'payments', 'binance-smart-chain', 'alameda-research-portfolio', 'multicoin-capital-portfolio'], 'max_supply': 170532785, 'circulating_supply': 154532785, 'total_supply': 170532785, 'platform': None, 'cmc_rank': 3, 'last_updated': '2021-04-06T21:16:17.000Z', 'quote': {'USD': {'price': 405.0598935039566, 'volume_24h': 5135791169.576727, 'percent_change_1h': 2.4766722, 'percent_change_24h': 8.19191755, 'percent_change_7d': 32.6945233, 'percent_change_30d': 75.57514085, 'percent_change_60d': 541.98708005, 'percent_change_90d': 881.50573075, 'market_cap': 62595033434.96982, 'last_updated': '2021-04-06T21:16:17.000Z'}}}, {'id': 52, 'name': 'XRP', 'symbol': 'XRP', 'slug': 'xrp', 'num_market_pairs': 662, 'date_added': '2013-08-04T00:00:00.000Z', 'tags': ['medium-of-exchange', 'enterprise-solutions', 'binance-chain', 'arrington-xrp-capital', 'galaxy-digital-portfolio', 'a16z-portfolio', 'pantera-capital-portfolio'], 'max_supply': 100000000000, 'circulating_supply': 45404028640, 'total_supply': 99990831162, 'platform': None, 'cmc_rank': 4, 'last_updated': '2021-04-06T21:17:03.000Z', 'quote': {'USD': {'price': 1.04733959535835, 'volume_24h': 36929086490.79997, 'percent_change_1h': 3.6474961, 'percent_change_24h': 23.33977412, 'percent_change_7d': 84.65437298, 'percent_change_30d': 127.7463018, 'percent_change_60d': 137.07977162, 'percent_change_90d': 337.68047475, 'market_cap': 47553436983.456535, 'last_updated': '2021-04-06T21:17:03.000Z'}}}, {'id': 825, 'name': 'Tether', 'symbol': 'USDT', 'slug': 'tether', 'num_market_pairs': 11828, 'date_added': '2015-02-25T00:00:00.000Z', 'tags': ['store-of-value', 'payments', 'stablecoin', 'stablecoin-asset-backed', 'solana-ecosystem'], 'max_supply': None, 'circulating_supply': 42990752850.31685, 'total_supply': 43646290993.53494, 'platform': {'id': 1027, 'name': 'Ethereum', 'symbol': 'ETH', 'slug': 'ethereum', 'token_address': '0xdac17f958d2ee523a2206206994597c13d831ec7'}, 'cmc_rank': 5, 'last_updated': '2021-04-06T21:16:17.000Z', 'quote': {'USD': {'price': 1.00180954051279, 'volume_24h': 147105163700.08792, 'percent_change_1h': -0.00337412, 'percent_change_24h': 0.13043176, 'percent_change_7d': 0.1191329, 'percent_change_30d': 0.16099888, 'percent_change_60d': 0.16947024, 'percent_change_90d': 0.05326217, 'market_cap': 43068546359.27484, 'last_updated': '2021-04-06T21:16:17.000Z'}}}, {'id': 2010, 'name': 'Cardano', 'symbol': 'ADA', 'slug': 'cardano', 'num_market_pairs': 255, 'date_added': '2017-10-01T00:00:00.000Z', 'tags': ['mineable', 'dpos', 'pos', 'platform', 'research', 'smart-contracts', 'staking', 'binance-chain'], 'max_supply': 45000000000, 'circulating_supply': 31948309440.7478, 'total_supply': 45000000000, 'platform': None, 'cmc_rank': 6, 'last_updated': '2021-04-06T21:16:11.000Z', 'quote': {'USD': {'price': 1.25155454518986, 'volume_24h': 6269725512.213743, 'percent_change_1h': -2.07133508, 'percent_change_24h': 4.42214999, 'percent_change_7d': 2.4917662, 'percent_change_30d': 12.76515356, 'percent_change_60d': 134.01783531, 'percent_change_90d': 325.17673752, 'market_cap': 39985051891.70002, 'last_updated': '2021-04-06T21:16:11.000Z'}}}, {'id': 6636, 'name': 'Polkadot', 'symbol': 'DOT', 'slug': 'polkadot-new', 'num_market_pairs': 175, 'date_added': '2020-08-19T00:00:00.000Z', 'tags': ['substrate', 'polkadot', 'binance-chain', 'polkadot-ecosystem', 'three-arrows-capital-portfolio', 'polychain-capital-portfolio', 'blockchain-capital-portfolio', 'boostvc-portfolio', 'cms-holdings-portfolio', 'coinfund-portfolio', 'fabric-ventures-portfolio', 'fenbushi-capital-portfolio', 'hashkey-capital-portfolio', 'kinetic-capital', '1confirmation-portfolio', 'placeholder-ventures-portfolio', 'pantera-capital-portfolio'], 'max_supply': None, 'circulating_supply': 926243043.5634505, 'total_supply': 1062267157.0176383, 'platform': None, 'cmc_rank': 7, 'last_updated': '2021-04-06T21:17:05.000Z', 'quote': {'USD': {'price': 43.13745049794805, 'volume_24h': 3219936954.166115, 'percent_change_1h': 0.06857841, 'percent_change_24h': -1.95999633, 'percent_change_7d': 27.0018333, 'percent_change_30d': 28.41686344, 'percent_change_60d': 109.63967495, 'percent_change_90d': 338.72895952, 'market_cap': 39955763440.78709, 'last_updated': '2021-04-06T21:17:05.000Z'}}}, {'id': 7083, 'name': 'Uniswap', 'symbol': 'UNI', 'slug': 'uniswap', 'num_market_pairs': 228, 'date_added': '2020-09-17T00:00:00.000Z', 'tags': ['decentralized-exchange', 'defi', 'dao', 'yield-farming', 'amm', 'coinbase-ventures-portfolio', 'three-arrows-capital-portfolio', 'governance', 'blockchain-capital-portfolio', 'defiance-capital', 'alameda-research-portfolio', 'a16z-portfolio', 'pantera-capital-portfolio', 'parafi-capital', 'paradigm-xzy-screener'], 'max_supply': 1000000000, 'circulating_supply': 523256856.47115046, 'total_supply': 1000000000, 'platform': {'id': 1027, 'name': 'Ethereum', 'symbol': 'ETH', 'slug': 'ethereum', 'token_address': '0x1f9840a85d5af5bf1d1762f925bdaddc4201f984'}, 'cmc_rank': 8, 'last_updated': '2021-04-06T21:16:11.000Z', 'quote': {'USD': {'price': 31.12928923765244, 'volume_24h': 568914709.7484151, 'percent_change_1h': 0.02767427, 'percent_change_24h': 0.43722838, 'percent_change_7d': 8.51145288, 'percent_change_30d': 0.51900684, 'percent_change_60d': 48.78864152, 'percent_change_90d': 409.23009991, 'market_cap': 16288614030.675232, 'last_updated': '2021-04-06T21:16:11.000Z'}}}, {'id': 2, 'name': 'Litecoin', 'symbol': 'LTC', 'slug': 'litecoin', 'num_market_pairs': 735, 'date_added': '2013-04-28T00:00:00.000Z', 'tags': ['mineable', 'pow', 'scrypt', 'medium-of-exchange', 'binance-chain'], 'max_supply': 84000000, 'circulating_supply': 66752414.51538747, 'total_supply': 66752414.51538747, 'platform': None, 'cmc_rank': 9, 'last_updated': '2021-04-06T21:17:02.000Z', 'quote': {'USD': {'price': 242.9633916548622, 'volume_24h': 9318409785.449207, 'percent_change_1h': 1.58679941, 'percent_change_24h': 11.0925692, 'percent_change_7d': 24.23189386, 'percent_change_30d': 31.49825467, 'percent_change_60d': 60.24127203, 'percent_change_90d': 51.72866252, 'market_cap': 16218393031.809793, 'last_updated': '2021-04-06T21:17:02.000Z'}}}, {'id': 1975, 'name': 'Chainlink', 'symbol': 'LINK', 'slug': 'chainlink', 'num_market_pairs': 489, 'date_added': '2017-09-20T00:00:00.000Z', 'tags': ['platform', 'defi', 'oracles', 'smart-contracts', 'substrate', 'polkadot', 'polkadot-ecosystem', 'solana-ecosystem', 'framework-ventures'], 'max_supply': 1000000000, 'circulating_supply': 417509556.43444455, 'total_supply': 1000000000, 'platform': {'id': 1027, 'name': 'Ethereum', 'symbol': 'ETH', 'slug': 'ethereum', 'token_address': '0x514910771af9ca656af840dff83e8264ecf986ca'}, 'cmc_rank': 10, 'last_updated': '2021-04-06T21:16:17.000Z', 'quote': {'USD': {'price': 34.37016617113642, 'volume_24h': 2808495199.288725, 'percent_change_1h': 1.68675913, 'percent_change_24h': 9.05688888, 'percent_change_7d': 22.63094934, 'percent_change_30d': 25.10625714, 'percent_change_60d': 31.84392867, 'percent_change_90d': 116.01508249, 'market_cap': 14349872832.689318, 'last_updated': '2021-04-06T21:16:17.000Z'}}}, {'id': 512, 'name': 'Stellar', 'symbol': 'XLM', 'slug': 'stellar', 'num_market_pairs': 335, 'date_added': '2014-08-05T00:00:00.000Z', 'tags': ['medium-of-exchange', 'enterprise-solutions', 'decentralized-exchange', 'smart-contracts', 'hashkey-capital-portfolio'], 'max_supply': 50001806812, 'circulating_supply': 22785681260.406754, 'total_supply': 50001803396.7887, 'platform': None, 'cmc_rank': 11, 'last_updated': '2021-04-06T21:17:06.000Z', 'quote': {'USD': {'price': 0.54033565169129, 'volume_24h': 5245142768.280184, 'percent_change_1h': 3.37469651, 'percent_change_24h': 7.14744287, 'percent_change_7d': 33.11473896, 'percent_change_30d': 33.55922282, 'percent_change_60d': 55.3151775, 'percent_change_90d': 91.57645886, 'market_cap': 12311915933.0719, 'last_updated': '2021-04-06T21:17:06.000Z'}}}, {'id': 1831, 'name': 'Bitcoin Cash', 'symbol': 'BCH', 'slug': 'bitcoin-cash', 'num_market_pairs': 579, 'date_added': '2017-07-23T00:00:00.000Z', 'tags': ['mineable', 'pow', 'sha-256', 'marketplace', 'enterprise-solutions', 'binance-chain'], 'max_supply': 21000000, 'circulating_supply': 18700881.25, 'total_supply': 18700881.25, 'platform': None, 'cmc_rank': 12, 'last_updated': '2021-04-06T21:16:09.000Z', 'quote': {'USD': {'price': 658.2993698785465, 'volume_24h': 5685814145.115592, 'percent_change_1h': 0.25032514, 'percent_change_24h': 6.63039386, 'percent_change_7d': 24.52915538, 'percent_change_30d': 30.08131641, 'percent_change_60d': 52.01052998, 'percent_change_90d': 52.10446019, 'market_cap': 12310778343.048525, 'last_updated': '2021-04-06T21:16:09.000Z'}}}, {'id': 2416, 'name': 'THETA', 'symbol': 'THETA', 'slug': 'theta', 'num_market_pairs': 51, 'date_added': '2018-01-17T00:00:00.000Z', 'tags': ['media', 'collectibles-nfts', 'content-creation', 'video', 'huobi-capital'], 'max_supply': 1000000000, 'circulating_supply': 1000000000, 'total_supply': 1000000000, 'platform': None, 'cmc_rank': 13, 'last_updated': '2021-04-06T21:17:05.000Z', 'quote': {'USD': {'price': 11.66543045119241, 'volume_24h': 365082525.14074886, 'percent_change_1h': -0.52342705, 'percent_change_24h': -0.62557224, 'percent_change_7d': -10.01162192, 'percent_change_30d': 179.28291648, 'percent_change_60d': 389.39405458, 'percent_change_90d': 456.27518714, 'market_cap': 11665430451.19241, 'last_updated': '2021-04-06T21:17:05.000Z'}}}, {'id': 2280, 'name': 'Filecoin', 'symbol': 'FIL', 'slug': 'filecoin', 'num_market_pairs': 112, 'date_added': '2017-12-13T00:00:00.000Z', 'tags': ['mineable', 'distributed-computing', 'filesharing', 'storage', 'polychain-capital-portfolio', 'blockchain-capital-portfolio', 'boostvc-portfolio', 'dcg-portfolio', 'hashkey-capital-portfolio', 'a16z-portfolio', 'winklevoss-capital', 'pantera-capital-portfolio'], 'max_supply': 2000000000, 'circulating_supply': 64698550, 'total_supply': 64698550, 'platform': None, 'cmc_rank': 14, 'last_updated': '2021-04-06T21:17:04.000Z', 'quote': {'USD': {'price': 166.96838010672514, 'volume_24h': 2475324138.941406, 'percent_change_1h': 0.37024939, 'percent_change_24h': -5.84434356, 'percent_change_7d': 14.1019259, 'percent_change_30d': 312.88250195, 'percent_change_60d': 556.35444044, 'percent_change_90d': 669.89462096, 'market_cap': 10802612088.753962, 'last_updated': '2021-04-06T21:17:04.000Z'}}}, {'id': 3408, 'name': 'USD Coin', 'symbol': 'USDC', 'slug': 'usd-coin', 'num_market_pairs': 886, 'date_added': '2018-10-08T00:00:00.000Z', 'tags': ['medium-of-exchange', 'stablecoin', 'stablecoin-asset-backed'], 'max_supply': None, 'circulating_supply': 10701284553.25657, 'total_supply': 10935302496.29955, 'platform': {'id': 1027, 'name': 'Ethereum', 'symbol': 'ETH', 'slug': 'ethereum', 'token_address': '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48'}, 'cmc_rank': 15, 'last_updated': '2021-04-06T21:17:05.000Z', 'quote': {'USD': {'price': 1.0016702670119, 'volume_24h': 1492667925.6445038, 'percent_change_1h': -0.00623742, 'percent_change_24h': 0.12119331, 'percent_change_7d': 0.13764092, 'percent_change_30d': 0.15185142, 'percent_change_60d': 0.18442668, 'percent_change_90d': 0.19390034, 'market_cap': 10719158555.83083, 'last_updated': '2021-04-06T21:17:05.000Z'}}}, {'id': 1958, 'name': 'TRON', 'symbol': 'TRX', 'slug': 'tron', 'num_market_pairs': 511, 'date_added': '2017-09-13T00:00:00.000Z', 'tags': ['media', 'payments'], 'max_supply': None, 'circulating_supply': 71659657369.49, 'total_supply': 100850743811.662, 'platform': None, 'cmc_rank': 16, 'last_updated': '2021-04-06T21:16:11.000Z', 'quote': {'USD': {'price': 0.12023377395961, 'volume_24h': 10666497577.898384, 'percent_change_1h': -1.38280983, 'percent_change_24h': -18.19901679, 'percent_change_7d': 83.5388578, 'percent_change_30d': 137.73408779, 'percent_change_60d': 235.99926728, 'percent_change_90d': 311.31508806, 'market_cap': 8615911046.186363, 'last_updated': '2021-04-06T21:16:11.000Z'}}}, {'id': 4256, 'name': 'Klaytn', 'symbol': 'KLAY', 'slug': 'klaytn', 'num_market_pairs': 31, 'date_added': '2020-03-30T00:00:00.000Z', 'tags': ['platform', 'enterprise-solutions'], 'max_supply': None, 'circulating_supply': 2448059130.2, 'total_supply': 10527368819.2, 'platform': None, 'cmc_rank': 17, 'last_updated': '2021-04-06T21:17:03.000Z', 'quote': {'USD': {'price': 3.43708080302498, 'volume_24h': 398613006.598883, 'percent_change_1h': -0.18651522, 'percent_change_24h': 3.98616401, 'percent_change_7d': -17.95950702, 'percent_change_30d': 116.85588005, 'percent_change_60d': 514.06987053, 'percent_change_90d': 650.84850594, 'market_cap': 8414177041.08045, 'last_updated': '2021-04-06T21:17:03.000Z'}}}, {'id': 3717, 'name': 'Wrapped Bitcoin', 'symbol': 'WBTC', 'slug': 'wrapped-bitcoin', 'num_market_pairs': 118, 'date_added': '2019-01-30T00:00:00.000Z', 'tags': ['medium-of-exchange', 'defi', 'stablecoin', 'stablecoin-asset-backed', 'wrapped-tokens'], 'max_supply': None, 'circulating_supply': 141602.84791701, 'total_supply': 141602.84791701, 'platform': {'id': 1027, 'name': 'Ethereum', 'symbol': 'ETH', 'slug': 'ethereum', 'token_address': '0x2260fac5e5542a773aa44fbcfedf7c193bc2c599'}, 'cmc_rank': 18, 'last_updated': '2021-04-06T21:17:07.000Z', 'quote': {'USD': {'price': 58268.692973170684, 'volume_24h': 119328797.86432272, 'percent_change_1h': 0.163808, 'percent_change_24h': -0.93183652, 'percent_change_7d': -1.03181988, 'percent_change_30d': 16.24982113, 'percent_change_60d': 54.17252068, 'percent_change_90d': 68.24914656, 'market_cap': 8251012869.402837, 'last_updated': '2021-04-06T21:17:07.000Z'}}}, {'id': 74, 'name': 'Dogecoin', 'symbol': 'DOGE', 'slug': 'dogecoin', 'num_market_pairs': 312, 'date_added': '2013-12-15T00:00:00.000Z', 'tags': ['mineable', 'pow', 'scrypt', 'medium-of-exchange', 'memes', 'payments'], 'max_supply': None, 'circulating_supply': 129072700574.95102, 'total_supply': 129072700574.95102, 'platform': None, 'cmc_rank': 19, 'last_updated': '2021-04-06T21:17:03.000Z', 'quote': {'USD': {'price': 0.06148653027568, 'volume_24h': 2501156924.1030483, 'percent_change_1h': -0.0267709, 'percent_change_24h': 5.51264765, 'percent_change_7d': 14.18176769, 'percent_change_30d': 20.92946895, 'percent_change_60d': 33.56381468, 'percent_change_90d': 531.47468079, 'market_cap': 7936232511.665504, 'last_updated': '2021-04-06T21:17:03.000Z'}}}, {'id': 3077, 'name': 'VeChain', 'symbol': 'VET', 'slug': 'vechain', 'num_market_pairs': 122, 'date_added': '2017-08-22T00:00:00.000Z', 'tags': ['logistics', 'data-provenance', 'iot', 'smart-contracts', 'fenbushi-capital-portfolio'], 'max_supply': 86712634466, 'circulating_supply': 64315576989, 'total_supply': 86712634466, 'platform': None, 'cmc_rank': 20, 'last_updated': '2021-04-06T21:17:02.000Z', 'quote': {'USD': {'price': 0.113128687309, 'volume_24h': 1584710073.9041638, 'percent_change_1h': 2.45566548, 'percent_change_24h': 7.02819179, 'percent_change_7d': 26.82127317, 'percent_change_30d': 104.43460758, 'percent_change_60d': 271.60156874, 'percent_change_90d': 294.80711983, 'market_cap': 7275936798.286496, 'last_updated': '2021-04-06T21:17:02.000Z'}}}]

And I have searched up and down stackoverflow and other websites, including coinmarketcap API documentation (here for referece: https://coinmarketcap.com/api/documentation/v1/) but I can't figure out how to get 'names' and 'price' from that data_quote. To me this looks like a dictionary but when I print type it returns this (see below) which throws me entirely off.

I've tried something like this:

newlist = [d['name'] for d in data_quote]
print(newlist)

But I get this:

TypeError: 'Response' object is not iterable

ANSWER

Answered 2021-Apr-07 at 16:35

The response basically looks like a list of dicts. So to extract names (or other keys) you can just do a list comprehension:

[d['name'] for d in data_quote]

Source https://stackoverflow.com/questions/66990264

QUESTION

Why would you delete the access keys to your NEAR account containing a smart contract?

Asked 2021-Mar-22 at 13:51

This answer about upgradability suggests that at some point you should delete access keys to the account containing a smart contract: How do you upgrade NEAR smart contracts?.

It makes sense that a smart contract should be "frozen" at some point, and you want to give its users confidence that it will not be changed. But what about contract rewards and other funds belonging to the contract account? How would the original owner get access to that if keys are deleted?

ANSWER

Answered 2021-Mar-22 at 13:51

But what about contract rewards and other funds belonging to the contract account? How would the original owner get access to that if keys are deleted?

The contract should be implemented in such a way that would allow certain operations.

Let's take a lockup contract as an example. This contract has a single owner, and the funds are locked for a certain amount of time, and the contract only provides certain methods to be called and guarded with the specific logic:

As an owner, I can delegate (stake) my tokens to staking pools while I still cannot arbitrary transfer the tokens
As an owner, I can withdraw the rewards from the staking pool through the lockup contract, and transfer those to an arbitrary account
Once the lockup time is over, as an owner, I can call add_full_access_key function, and thus gain full access over the account, and even delete it after that (transferring all the tokens to some other account).

All that is explicitly implemented on the contract level, and easy to review, and given there is no other AccessKey on the lockup contract, we can be sure that there is no other way to interfere with the contract logic.

Source https://stackoverflow.com/questions/66736229

QUESTION

Listening to Uniswap contract events using web3.py and infura.io

Asked 2020-Dec-06 at 11:24

I want to use web3.py and infura.io to listen for Uniswap factory events however I am not too sure where to go about doing so.

Here is a link: https://uniswap.org/docs/v2/smart-contracts/factory/

More specifically I want to listen for the PairCreated event.

ANSWER

Answered 2020-Jun-25 at 08:22

Here is rough guide

Get ABI for Uniswap contract
Create a web3.py contract object
You can use web3.eth.getLogs() to query events over past block range
You cannot query all events once, because there are so many events and Infura would time out. Instead you need to query events carefully over a block range slices.

Here is some old code which may or may not work with the latest web3.py versions

https://github.com/TokenMarketNet/sto/blob/master/sto/ethereum/scanner.py#L153

If you want a real time scanner you can listed to events over a WebSocket connection as they happen:

https://web3py.readthedocs.io/en/stable/filters.html#asynchronous-filter-polling

Source https://stackoverflow.com/questions/62377210

QUESTION

Cant get TRON contract ABI from Trongrid

Asked 2020-Oct-20 at 10:57

For some TRON contracts i am not able to get ABI. Eg using https://developers.tron.network/reference#smart-contracts for this one:

contract - TQn9Y2khEsLJW1ChVWFMSMeRDow5KcbLSE

curl --request POST \
  --url https://api.trongrid.io/wallet/getcontract \
  --header 'content-type: application/json' \
  --data '{"value":"41a2726afbecbd8e936000ed684cef5e2f5cf43008","visible":false}'

it does not return ABI. Why it does not return? how to get this ABI not using tronscan?

ANSWER

Answered 2020-Oct-20 at 10:57

This is a contract created by another contract. So there's no chance for the developer to set an ABI.

You should refer to the creator contract's code.

Source https://stackoverflow.com/questions/64370566

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