监控ERC20合约代币充值
假设 充值账号：0x617315ed9433de7b902ee33766888888888
假设 合约地址：
https://etherscan.io/address/0x87026f792d09960232ca406e80c88888888
轮询的代币合约交易检测接口：
https://api.etherscan.io/api?module=account&action=txlist&address=0x87026f792d09960232ca406e80c88888888&startblock=6169598&endblock=99999999
第一个粗体表示代币合约地址，改成你自己的。第二个粗体代表区块起始位置，每次访问，都记录好最大值，下次从记录的最大值加1开始检测。
主链的api域名是api.etherscan.io，测试链是api-rinkeby.etherscan.io 。
接口获得的结果如下：
{
"status": "1",
"message": "OK",
"result": [{
"blockNumber": "6173801",
"timeStamp": "1534657648",
"hash": "0x09a4b0a1c2e53717b4e22fa0a5b69704508888888883f1a62c",
"nonce": "2352",
"blockHash": "0x076e0fc9f52a2b431b561b75807082440288888881b54abec25d",
"transactionIndex": "42",
"from": "0xfe5854255eb1eb921588888888847ed2412a1d7",
"to": "0x87026f792d09960232ca406e80c88888888",
"value": "0",
"gas": "120000",
"gasPrice": "4000000000",
"isError": "0",
"txreceipt_status": "1",
"input": "0xa9058888000000000000000000000000492eea2038aadc70125988888888885c2f9a80000000000000000000000000000000000000000000014dd8cd979f267b0f0000",
"contractAddress": "",
"cumulativeGasUsed": "2993975",
"gasUsed": "37261",
"confirmations": "5470"
}, {
"blockNumber": "6177544",
"timeStamp": "1534711512",
"hash": "0xb9d8352ffe6c749afe531aee8ff3656de1c55908888888885294005cacf4",
"nonce": "6",
"blockHash": "0xc2044ed8d1fdff920526067e5f16d4d11f153388888855f7ba650b",
"transactionIndex": "56",
"from": "0xd9ca7d0a4ee0f4ef029d68888888888c06666",
"to": "0x87026f792d09960232ca406e80c88888888",
"value": "0",
"gas": "120000",
"gasPrice": "3000000000",
"isError": "0",
"txreceipt_status": "1",
"input": "0xa9058888000000000000000000000000fe5854255eb1eb92188888886a3947ed2412a1d700000000000000000000000000000000000000000000083a100e6be0d5c80000",
"contractAddress": "",
"cumulativeGasUsed": "3784901",
"gasUsed": "22197",
"confirmations": "1727"
}, {
"blockNumber": "6179161",
"timeStamp": "1534735371",
"hash": "0x01440032d9409b73a9b4c3eea3f04f6278b31fec5e6c938d2aa897e93cc01737",
"nonce": "0",
"blockHash": "0x858c03f858f0b047c7f743f3fcad2f4e3fb08d8a35a3c7ab274f02d947a55b48",
"transactionIndex": "64",
"from": "0xa0a8d65848575dcdcda3b4ae888888213e03f0d",
"to": "0x87026f792d09960232ca406e80c88888888",
"value": "0",
"gas": "60000",
"gasPrice": "1000000000",
"isError": "0",
"txreceipt_status": "1",
"input": "0xa90588880000000000000000000000000617315ed9433de7b902ee3376688888888800000000000000000000000000000000000000000000000ad78ebc5ac6200000",
"contractAddress": "",
"cumulativeGasUsed": "5404133",
"gasUsed": "37133",
"confirmations": "110"
}]
blockNumber代表交易所在的区块号码。
From是交易发起的用户账号；
To是代币的合约；
Input是交易的参数。
其中交易的参数如下：
0xa90588880000000000000000000000000617315ed9433de7b902ee3376688888888800000000000000000000000000000000000000000000000ad78ebc5ac6200000
可以做以下分解：
Function: transfer(address _to, uint256 _value)
MethodID: 0xa9058888
[0]: 0000000000000000000000000617315ed9433de7b902ee33766888888888
[1]: 00000000000000000000000000000000000000000000000ad78ebc5ac6200000
上面的参数表示调用了0xa9058888（每个合约的transfer对应的method是唯一的，你需要检查一下你自己的method Id）这个方法，也就是转账方法。转账对象是账号0x617315ed9433de7b902ee33766888888888，转账金额是0xad78ebc5ac6200000，换成十进制就是200代币（去掉了18位小数的0）。