如何获取BEP20代币的价格？

Question

我想计算 BNB 中 BEP20 代币的价格。 我检查了 poocoin 和 pancakeswap 他们是如何计算价格的。我看到他们通过web3.js不断调用bsc-dataseed，但我还没有找到解决方案。

我的调查现状：

1. 他们不断调用数据种子（webrpc）来获取最新的区块号：

// Request params
{
    "jsonrp": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "id": 1
}

2. 他们收到最新的区块后，立即使用以下参数开始另一个调用

{
  "jsonrpc": "2.0",
  "id": 53,
  "method": "eth_call",
  "params": [
    {
      "to": "0x1ee38d535d541c55c9dae27b12edf090c608e6fb",
      "data": "0x252dba420000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001c00000000000000000000000000000000000000000000000000000000000003800000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000048000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000000580000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000006800000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000078000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000880000000000000000000000000000000000000000000000000000000000000090000000000000000000000000000000000000000000000000000000000000009800000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000a800000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000b800000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000c800000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000d800000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000e800000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000000f8000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001080000000000000000000000000000000000000000000000000000000000000110000000000000000000000000003ff6c83226cdb10c7a42a2c54c67d63a135ab69000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000003fc20bdafdac6b2ae8f7f5f885f0819c2b968f0000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000008b018585d4949ae4714f057b66b8b033408bfa6000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000012c8db147721ac1e3e54e9ff73d99ef0ee4b1725000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000001b96b92314c44b159149f7e0303511fb2fc4774f000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000020bcc3b8a0091ddac2d0bc30f68e6cbb97de59cd000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000002c5d712cf39eaebc1ef2d1281eb48a70dcd34d49000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000003ab77e40340ab084c3e23be8e5a6f7afed9d41dc000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000003b872e6b1633f060680cf9c277b43dd1e254e564000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000056c77d59e82f33c712f919d09fceddf49660a829000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000006f656513f6e8eae19b6dc30cd372dd6ba4b5543a000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000070d8929d04b60af4fb9b58713ebcf18765ade422000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000007246d6ea86d34af343f03cc1eb952a4f98467a4e000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000007380e10f5c5f9dff4857de3cf9c39bb16f4c6dcf000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000007561eee90e24f3b348e1087a005f78b4c8453524000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000088c4bcf826410a81b58bc9b79a17641b443dc52e000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac0000000000000000000000000000000000000000000000000000000000000000000000000000000092ee07c591c26775b4d31259d5417e00553e857c000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac000000000000000000000000000000000000000000000000000000000000000000000000000000009adc6fb78cefa07e13e9294f150c1e8c1dd566c0000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000cc6b11de64dce6e5052a84b67cbbfd210ed530f7000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000d1f12370b2ba1c79838337648f820a87edf5e1e6000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000b3c4217ab2b265bf8c69718d280e3708b5e50577000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000b8875e207ee8096a929d543c9981c9586992eacb000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000c15fa3e22c912a276550f3e5fe3b0deb87b55acd000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000cee09ae86a78ce0cea3a4ea8cced5d41c0468e67000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000d9a0d1f5e02de2403f68bb71a15f8847a854b494000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000e7cc44de50b54906a9c1c48240650be2766481fc000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000fb7deb2236815222113d949d935cca4901531677000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000000000000000000000000000fa3107bca2ff6db4131bcd62b598cb00d9087f58000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040902f1ac00000000000000000000000000000000000000000000000000000000"
    },
    "latest"
  ]
}

据我所知，

0x1ee38d535d541c55c9dae27b12edf090c608e6fb

是一个包含

multicall

方法的合约。数据的前10个字符（0x252dba42）是

aggregate

方法。但数据的剩余部分是什么呢？
这是

aggregate

方法的合约 ABI：

{
    "constant": true,
    "inputs": [
      {
        "components": [
            {"name": "target","type": "address"},
            {"name": "callData","type": "bytes"}
        ],
        "name": "calls",
        "type": "tuple[]"
      }
    ],
    "name": "aggregate",
    "outputs": [
      {
        "name": "blockNumber",
        "type": "uint256"
      },
      {
        "name": "returnData",
        "type": "bytes[]"
      }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  }

需要第二次通话吗？

如何根据这些数据计算价格？

Answer 1

关于是否可以从 web3 计算代币价格的问题的答案在这里：https://ethereum.stackexchange.com/questions/98302/how-can-we-get-the-current-spot-使用 web3 的 bep20 代币的价格

但是：部分回答你的问题。

eth_blockNumber

用于获取最新区块中传递的交易并在此处显示值：

eth_call

使用方法 sha3

0x252dba42

调用，该方法对应于您提到的

aggregator

函数。代码如下：

contract Multicall {
struct Call {
    address target;
    bytes callData;
}
function aggregate(Call[] memory calls) public returns (uint256 blockNumber, bytes[] memory returnData) {
    blockNumber = block.number;
    returnData = new bytes[](calls.length);
    for(uint256 i = 0; i < calls.length; i++) {
        (bool success, bytes memory ret) = calls[i].target.call(calls[i].callData);
        require(success);
        returnData[i] = ret;
    }
}

如您所见，这只是执行多个 eth_call

calls[i].target.call(calls[i].callData);

的一种方法，这意味着它是一种只需调用 Web3 一次即可执行大量

eth_call

操作的有效方法，因此可以大幅增加执行时间。

然后深入细节，您将必须解析更大结构中包含的不同

eth_call

。

例如，给出以下查询（eth_call）：

0x252dba42
0000000000000000000000000000000000000000000000000000000000000020
000000000000000000000000000000000000000000000000000000000000000d
00000000000000000000000000000000000000000000000000000000000001a0
0000000000000000000000000000000000000000000000000000000000000220
00000000000000000000000000000000000000000000000000000000000002a0
0000000000000000000000000000000000000000000000000000000000000320
00000000000000000000000000000000000000000000000000000000000003a0
0000000000000000000000000000000000000000000000000000000000000420
00000000000000000000000000000000000000000000000000000000000004a0
0000000000000000000000000000000000000000000000000000000000000520
00000000000000000000000000000000000000000000000000000000000005c0
0000000000000000000000000000000000000000000000000000000000000660
0000000000000000000000000000000000000000000000000000000000000700
0000000000000000000000000000000000000000000000000000000000000780
0000000000000000000000000000000000000000000000000000000000000800
000000000000000000000000b443d19e5448c8a58916ca8e0a33c41212668ad3
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
0902f1ac > getReserves() -> pancake
00000000000000000000000000000000000000000000000000000000
000000000000000000000000b443d19e5448c8a58916ca8e0a33c41212668ad3
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
d21220a7 > token1 -> pancake
00000000000000000000000000000000000000000000000000000000
000000000000000000000000b443d19e5448c8a58916ca8e0a33c41212668ad3
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
18160ddd > totalSupply -> swole
00000000000000000000000000000000000000000000000000000000
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
313ce567 > decimals > swole
00000000000000000000000000000000000000000000000000000000
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
18160ddd > totalSupply > swole
00000000000000000000000000000000000000000000000000000000
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
95d89b41 > symbol > swole
00000000000000000000000000000000000000000000000000000000
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
06fdde03 > name > swole 
00000000000000000000000000000000000000000000000000000000
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000024
70a08231 > balanceOf > swole
00000000000000000000000000000000000000000000000000000000
0000dead00000000000000000000000000000000000000000000000000000000
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000024
70a08231 > balanceOf > swole
00000000000000000000000000000000000000000000000000000000
00000ded00000000000000000000000000000000000000000000000000000000
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000024
70a08231 > balanceOf > pancake
00000000000000000000000000000000000000000000000000000000
0000000100000000000000000000000000000000000000000000000000000000
000000000000000000000000b443d19e5448c8a58916ca8e0a33c41212668ad3
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
0902f1ac > getReserves > pancake
00000000000000000000000000000000000000000000000000000000
000000000000000000000000b443d19e5448c8a58916ca8e0a33c41212668ad3
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
d21220a7 > Token1 (pancake)
00000000000000000000000000000000000000000000000000000000
000000000000000000000000b443d19e5448c8a58916ca8e0a33c41212668ad3
0000000000000000000000000000000000000000000000000000000000000040
0000000000000000000000000000000000000000000000000000000000000004
18160ddd > TotalSupply 
00000000000000000000000000000000000000000000000000000000

如果你想找到sha3所涉及的方法名称，可以参考这个网站：https://pkg.go.dev/github.com/y2labs-0sh/dada-api/contractabi

作为给定的

eth_call

的结果，它会给你：

0x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 > decimals
0000000000000000000000000000000000000000000000000000000000000020
0000000000000000000000000000000000000001431e0fae6d7217caa0000000
0000000000000000000000000000000000000000000000000000000000000060
0000000000000000000000000000000000000000000000000000000000000020
0000000000000000000000000000000000000000000000000000000000000004
534f474500000000000000000000000000000000000000000000000000000000 > SOGE
0000000000000000000000000000000000000000000000000000000000000060
0000000000000000000000000000000000000000000000000000000000000020
000000000000000000000000000000000000000000000000000000000000000a
53776f6c6520446f676500000000000000000000000000000000000000000000 > Swole Doge
0000000000000000000000000000000000000000000000000000000000000020
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000020
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000020
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000060
0000000000000000000000000000000000000000000000000d04526e1cee610a
0000000000000000000000000000000000000000096f9d05ebe63c03e58cc07a
0000000000000000000000000000000000000000000000000000000060a16f16
0000000000000000000000000000000000000000000000000000000000000020
000000000000000000000000f5318b3941b3f1239dd910c941bbe2259f32311b
0000000000000000000000000000000000000000000000000000000000000020
000000000000000000000000000000000000000000000a968163f0a57b400000

另请注意，poocoin 每次都会使用不同的代币地址进行多次 eth_call。

poocoin 如何利用这些数据来获取价格？我不知道，现在甚至可以确定这些

eth_call

是用来确定代币价格的。不过如果你发现了，我会感兴趣的。

干杯，

Answer 2

您可以使用Bitquery的API。这是获取链上数据的最简单方法。

在 Bitquery IDE 中尝试此 API，您必须先注册才能获得免费积分。我在这里获取 ETH wrt WBNB 的价格。

API 链接 - https://ide.bitquery.io/API-to-get-price-of-Binance-Smart-Chain-token-on-PancakeSwap

您可以观看此视频教程，该视频教程展示了如何在 Raydium 上获取 Solana 上特定代币的价格，您可以通过此视频了解 API。

视频教程 - https://www.youtube.com/watch?v=T1AVFL7weBI&t=37s

完全披露 - 我在 Bitquery 工作。