eth_estimateGas

Network: Ethereum · Mainnet · Chain ID 1 (0x1)

Generates and returns an estimate of how much gas is necessary to allow the transaction to complete. The transaction will not be added to the blockchain.

Parameters

Object — Transaction call object (same as eth_call):

Field Type Required Description
from DATA No Sender address
to DATA No Recipient address
gas QUANTITY No Gas limit
gasPrice QUANTITY No Gas price
value QUANTITY No Value in wei
data DATA No Call data
QUANTITY|TAG — (Optional) Block number, or "latest".

Field	Type	Required	Description
from	DATA	No	Sender address
to	DATA	No	Recipient address
gas	QUANTITY	No	Gas limit
gasPrice	QUANTITY	No	Gas price
value	QUANTITY	No	Value in wei
data	DATA	No	Call data

Returns

QUANTITY — The estimated amount of gas.

Request


{
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "params": [
    {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "value": "0x0",
      "data": "0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"
    }
  ],
  "id": 1
}

Response


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

Code Examples


curl -X POST https://ethereum-rpc.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}'


const response = await fetch("https://ethereum-rpc.blockreq.com/v1/rpc/public", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "params": [
    {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "value": "0x0",
      "data": "0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"
    }
  ],
  "id": 1
}),
});
const data = await response.json();
console.log(data.result);


import requests

response = requests.post(
    "https://ethereum-rpc.blockreq.com/v1/rpc/public",
    json={
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "params": [
    {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "value": "0x0",
      "data": "0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"
    }
  ],
  "id": 1
}
)
print(response.json()["result"])


package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
)

func main() {
	payload := []byte(`{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{"from":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","value":"0x0","data":"0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"}],"id":1}`)
	resp, err := http.Post(
		"https://ethereum-rpc.blockreq.com/v1/rpc/public",
		"application/json",
		bytes.NewBuffer(payload),
	)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	var result map[string]interface{}
	json.Unmarshal(body, &result)
	fmt.Println(result["result"])
}


import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://ethereum-rpc.blockreq.com/v1/rpc/public"),
});

const result = await client.request({
  method: "eth_estimateGas",
  params: [{"from":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","value":"0x0","data":"0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"}],
});
console.log(result);


cast rpc --rpc-url https://ethereum-rpc.blockreq.com/v1/rpc/public eth_estimateGas {"from":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","value":"0x0","data":"0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"}


const { ethers } = require("hardhat");

async function main() {
  const provider = new ethers.JsonRpcProvider("https://ethereum-rpc.blockreq.com/v1/rpc/public");
  const result = await provider.send("eth_estimateGas", [{"from":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","value":"0x0","data":"0xa9059cbb0000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000000000000000000f4240"}]);
  console.log(result);
}

main();