debug_tracecall - Worldchain

Example code for the debug_traceCall JSON-RPC method. Complete guide on how to use debug_traceCall JSON-RPC in GetBlock Web3 documentation.

Traces a call without creating a transaction on the World Chain network for debugging purposes.

Parameters

Parameter

Type

Description

transaction

object

Transaction call object

blockNumber

string

Block number in hex, or "latest", "earliest", "pending"

tracerConfig

object

(Optional) Tracer configuration options

Request

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "debug_traceCall",
    "params": [{"to": "0x1234567890123456789012345678901234567890", "data": "0x..."}, "latest", {}],
    "id": "getblock.io"
}'

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "debug_traceCall",
    "params": [{"to": "0x1234567890123456789012345678901234567890", "data": "0x..."}, "latest", {}],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));

import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "debug_traceCall",
    "params": [{"to": "0x1234567890123456789012345678901234567890", "data": "0x..."}, "latest", {}],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "debug_traceCall",
            "params": [{"to": "0x1234567890123456789012345678901234567890", "data": "0x..."}, "latest", {}],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "gas": 21000,
        "structLogs": [...]
    }
}

Response Parameters

Field

Type

Description

gas

number

Gas used by the call

structLogs

array

Array of structured logs from execution

Use Case

The debug_traceCall method on World Chain is typically used for:

Call simulation
Gas estimation debugging
Contract call analysis
Pre-execution verification

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS-TOKEN

Web3 Integration

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

const trace = await provider.send('debug_traceCall', [{
    to: '0x1234567890123456789012345678901234567890',
    data: '0x...'
}, 'latest', {}]);
console.log('Trace:', trace);

import { createPublicClient, http } from 'viem';
import { worldchain } from 'viem/chains';

const client = createPublicClient({
    chain: worldchain,
    transport: http('https://go.getblock.io/<ACCESS-TOKEN>/')
});

const trace = await client.request({
    method: 'debug_traceCall',
    params: [{
        to: '0x1234567890123456789012345678901234567890',
        data: '0x...'
    }, 'latest', {}]
});
console.log('Trace:', trace);

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