eth_call

Network: Optimism Sepolia · Testnet · Chain ID 11155420 (0xaa37dc)

Counts as 1 request. See Request Counting.

Executes a new message call immediately without creating a transaction on the blockchain. Commonly used to read data from smart contracts.

Parameters

Object — The transaction call object:

Field Type Required Description
from DATA No Sender address
to DATA Yes Contract address
gas QUANTITY No Gas limit
gasPrice QUANTITY No Gas price
value QUANTITY No Value sent
data DATA No ABI-encoded function call
QUANTITY|TAG — Block number, or "latest", "earliest", "pending".

Field	Type	Required	Description
from	DATA	No	Sender address
to	DATA	Yes	Contract address
gas	QUANTITY	No	Gas limit
gasPrice	QUANTITY	No	Gas price
value	QUANTITY	No	Value sent
data	DATA	No	ABI-encoded function call

Returns

DATA — The return value of the executed contract function.

Request


{
  "jsonrpc": "2.0",
  "method": "eth_call",
  "params": [
    {
      "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "data": "0x18160ddd"
    },
    "latest"
  ],
  "id": 1
}

The example reads ERC-20 totalSupply() (selector 0x18160ddd). Replace to with a token contract on Optimism Sepolia.

Response


{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x0000000000000000000000000000000000000000000000000000001234567890"
}

Code Examples


curl -X POST https://optimism-sepolia-rpc.blockreq.com/v1/rpc/public \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","data":"0x18160ddd"},"latest"],"id":1}'


const response = await fetch("https://optimism-sepolia-rpc.blockreq.com/v1/rpc/public", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "jsonrpc": "2.0",
  "method": "eth_call",
  "params": [
    {
      "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "data": "0x18160ddd"
    },
    "latest"
  ],
  "id": 1
}),
});
const data = await response.json();
console.log(data.result);


import requests

response = requests.post(
    "https://optimism-sepolia-rpc.blockreq.com/v1/rpc/public",
    json={
  "jsonrpc": "2.0",
  "method": "eth_call",
  "params": [
    {
      "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "data": "0x18160ddd"
    },
    "latest"
  ],
  "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_call","params":[{"to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","data":"0x18160ddd"},"latest"],"id":1}`)
	resp, err := http.Post(
		"https://optimism-sepolia-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://optimism-sepolia-rpc.blockreq.com/v1/rpc/public"),
});

const result = await client.request({
  method: "eth_call",
  params: [{"to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","data":"0x18160ddd"},"latest"],
});
console.log(result);


cast rpc --rpc-url https://optimism-sepolia-rpc.blockreq.com/v1/rpc/public eth_call {"to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","data":"0x18160ddd"} latest


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

async function main() {
  const provider = new ethers.JsonRpcProvider("https://optimism-sepolia-rpc.blockreq.com/v1/rpc/public");
  const result = await provider.send("eth_call", [{"to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","data":"0x18160ddd"},"latest"]);
  console.log(result);
}

main();