0x气体估计有多精确？

Question

我试图通过‘swap /v1/ estimatedGas’方法从0x获得交换的气体估计值，但是字段gas和D1在大多数情况下都是错误的。

有什么办法能更好地计算它吗？

例如：

请求：https://api.0x.org/swap/v1/quote?sellToken=0x6B3595068778DD592e39A122f4f5a5cF09C90fE2&buyToken=0xb9871cB10738eADA636432E86FC0Cb920Dc3De24&sellAmount=1000000000000000000

响应：

{
    "chainId": 1,
    "price": "3.356694278670382019",
    "guaranteedPrice": "3.323127335883678198",
    "to": "0xdef1c0ded9bec7f1a1670819833240f027b25eff",
    "data": "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",
    "value": "0",
    "gas": "171000",
    "estimatedGas": "171000",
    "gasPrice": "76000000000",
    "protocolFee": "0",
    "minimumProtocolFee": "0",
    "buyTokenAddress": "0xb9871cb10738eada636432e86fc0cb920dc3de24",
    "sellTokenAddress": "0x6b3595068778dd592e39a122f4f5a5cf09c90fe2",
    "buyAmount": "3356694278670382019",
    "sellAmount": "1000000000000000000",
    "sources": [
        ...
        {
            "name": "Uniswap_V2",
            "proportion": "1"
        },
        ...
    ],
    "orders": [
        {
            "makerToken": "0xb9871cb10738eada636432e86fc0cb920dc3de24",
            "takerToken": "0x6b3595068778dd592e39a122f4f5a5cf09c90fe2",
            "makerAmount": "3356694278670382019",
            "takerAmount": "1000000000000000000",
            "fillData": {
                "tokenAddressPath": [
                    "0x6b3595068778dd592e39a122f4f5a5cf09c90fe2",
                    "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
                    "0xb9871cb10738eada636432e86fc0cb920dc3de24"
                ],
                "router": "0xf164fc0ec4e93095b804a4795bbe1e041497b92a"
            },
            "source": "Uniswap_V2",
            "sourcePathId": "0xe30e17bcf3f2833e73f760a19a94f03dd79ca1f583c2893c5eb69673bad00ec9",
            "type": 0
        }
    ],
    "allowanceTarget": "0xdef1c0ded9bec7f1a1670819833240f027b25eff",
    "sellTokenToEthRate": "277.53194847477435333",
    "buyTokenToEthRate": "940.66817609680155706"
}

但是交易失败了，Out of Gas例外，即使有25万的天然气。(链接：https://etherscan.io/tx/0xe95a629944aba94ba4e32be41467506cbb9b9cca34de38426d8bd5c8d8a9e311)

如果为API调用提供了skipValidation=true和takerAddress=，也会发生同样的问题。

有什么办法能得到更准确的结果吗？

Answer 1

不同的代币在转让时会花费不同的金额，即在互换期间。0xAPI并不知道存在的每个令牌的气体成本。

在以下情况下，0xAPI将为您执行更准确的气体估计：

1. 提供takerAddress和skipValidation=false (默认)
2. 接受者必须有资金和津贴。

没有上述这些，我们就无法给出准确的气体估计，因为事务需要在估计过程中成功。当我们没有上述条件时，我们提供了一个大致的气体成本。

另外，您可以通过使用从0xAPI响应提供的数据对Ethereum节点执行一个eth_estimateGas来测量气体。