最近要查 ERC20 鏈上面 USDT 餘額，於是我問一下同事有沒有好的地方可以查，非常懶得自己架節點
於是 好友11 就推薦這個 https://ethplorer.io/zh/
基本上很簡單，去註冊後，驗證電話就可以拿到 token 他的配額也還夠用
一天有 756,000 次查詢的配額，小專案應該蠻夠用的
而且 API 也完整 https://github.com/EverexIO/Ethplorer/wiki/Ethplorer-API
今天大概就來測試一下如何取得 ETH , USDT , USDC 現在的餘額
基本上使用到的 API 就是 https://github.com/EverexIO/Ethplorer/wiki/Ethplorer-API#get-address-info
透過這就可以知道該地址現在的狀況，不過在這之前，因為 合約是誰都可以發的，所以你必須要知道正版的
USDT , USDC 合約，在正式鏈上面
USDT合約是 0xdac17f958d2ee523a2206206994597c13d831ec7
USDC合約是 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
這時候就可以來開始寫 code
回應的模型:
<![CDATA[
// Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(myJsonResponse);
public class Price
{
public double rate { get; set; }
public double diff { get; set; }
public double diff7d { get; set; }
public int ts { get; set; }
public double marketCapUsd { get; set; }
public double availableSupply { get; set; }
public double volume24h { get; set; }
public double diff30d { get; set; }
public double volDiff1 { get; set; }
public double volDiff7 { get; set; }
public double volDiff30 { get; set; }
}
public class ETH
{
public Price price { get; set; }
public double balance { get; set; }
public string rawBalance { get; set; }
public double totalIn { get; set; }
public int totalOut { get; set; }
}
public class TokenInfo
{
public string address { get; set; }
public string decimals { get; set; }
public string name { get; set; }
public string owner { get; set; }
public string symbol { get; set; }
public string totalSupply { get; set; }
public int lastUpdated { get; set; }
public int issuancesCount { get; set; }
public int holdersCount { get; set; }
public int ethTransfersCount { get; set; }
public object price { get; set; }
public int? slot { get; set; }
public string storageTotalSupply { get; set; }
public string image { get; set; }
public string website { get; set; }
public string links { get; set; }
public string coingecko { get; set; }
public List<string> publicTags { get; set; }
public string twitter { get; set; }
public string facebook { get; set; }
}
public class Token
{
public TokenInfo tokenInfo { get; set; }
public double balance { get; set; }
public int totalIn { get; set; }
public int totalOut { get; set; }
public string rawBalance { get; set; }
}
public class GetAddressInfoResponseModel
{
public string address { get; set; }
public ETH ETH { get; set; }
public int countTxs { get; set; }
public List<Token> tokens { get; set; }
}
]]>
主程式 這邊我測試錢包為 0x630eb51fdf14837d782c7bcc13b5ef29ffa47021
我有用到 RestSharp
<![CDATA[
var client = new RestSharp.RestClient("https://api.ethplorer.io/");
var request = new RestSharp.RestRequest("getAddressInfo/" + "0x630eb51fdf14837d782c7bcc13b5ef29ffa47021", RestSharp.Method.Get);
request.AddParameter(RestSharp.Parameter.CreateParameter("apiKey", "freekey", RestSharp.ParameterType.QueryString));
request.AddParameter(RestSharp.Parameter.CreateParameter("showETHTotals", "true", RestSharp.ParameterType.QueryString));
var queryResult = client.ExecuteAsync(request).Result.Content;
var resultData = JsonConvert.DeserializeObject<GetAddressInfoResponseModel>(queryResult);
Console.WriteLine("ETH 餘額:");
Console.WriteLine(resultData.ETH.balance);
//USDT Contract : 0xdac17f958d2ee523a2206206994597c13d831ec7
var usdtInfo = resultData.tokens.SingleOrDefault(x => x.tokenInfo.address == "0xdac17f958d2ee523a2206206994597c13d831ec7");
if (usdtInfo != null)
{
Console.WriteLine("USDT (0xdac17f958d2ee523a2206206994597c13d831ec7)餘額:");
Console.WriteLine(usdtInfo.balance / Math.Pow(10, int.Parse(usdtInfo.tokenInfo.decimals)));
}
//USDC Contract : 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
var usdcInfo = resultData.tokens.SingleOrDefault(x => x.tokenInfo.address == "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48");
if (usdcInfo != null)
{
// Console.WriteLine(usdcInfo.balance );
Console.WriteLine("USDC (0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48)餘額:");
Console.WriteLine(usdcInfo.balance/Math.Pow(10, int.Parse(usdcInfo.tokenInfo.decimals)));
}
]]>
結果:
比對一下 etherscan
結果也正確
不過這是現在的，你可能看到的時候應該不是這數字
而且我不知道這是誰的錢包，我只是網路上找一個來測試的
這裡面有一個小地方就是每一個合約的 decimal 不一樣，所以你必須要 除上 10^n 才會拿到正確得數字
