eth_estimateGas

生成并返回交易完成所需的 Gas 估算值。该调用不会将交易写入区块链。

参数

1. Object — 交易调用对象（同 eth_call）：

   字段	类型	必填	说明
   from	DATA	否	发送方地址
   to	DATA	否	接收方地址
   gas	QUANTITY	否	Gas 上限
   gasPrice	QUANTITY	否	Gas 单价
   value	QUANTITY	否	wei 金额
   data	DATA	否	调用数据

2. QUANTITY|TAG —（可选）区块号，或 "latest"。

返回

QUANTITY — 预估 Gas 数量。

请求

curl -X POST https://eth-mainnet.blockreq.com/v1/rpc/public \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "value": "0x0",
      "data": "0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"
    }],
    "id": 1
  }'

响应

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0xc350"
}

代码示例

JavaScript (ethers.js v6)

import { JsonRpcProvider } from "ethers";
const provider = new JsonRpcProvider("https://eth-mainnet.blockreq.com/v1/rpc/YOUR_API_KEY");
const gas = await provider.estimateGas({
  to: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
  data: "0xa9059cbb..."
});
console.log("Estimated gas:", gas.toString());

Python (web3.py)

from web3 import Web3
w3 = Web3(Web3.HTTPProvider("https://eth-mainnet.blockreq.com/v1/rpc/YOUR_API_KEY"))
gas = w3.eth.estimate_gas({
    "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "data": "0xa9059cbb..."
})
print(f"Estimated gas: {gas}")

RU 成本

Method	Cost
eth_estimateGas	20 RU

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