debug_traceBlockByHash - GIWA

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

This method traces the execution of every transaction in a block identified by its hash. It is a Dedicated Node tier method commonly used with the callTracer.

This method belongs to the debug namespace and is available on GetBlock Dedicated Nodes only. It is not served on shared endpoints.

Parameters

Parameter	Type	Required	Description
blockHash	string	Yes	32-byte block hash
options	object	No	Tracer options (e.g. callTracer)

Request

cURL

curl --location --request POST 'https://shared.ap-southeast-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "debug_traceBlockByHash",
    "params": ["0x9f2b4c1d7e3a6084b5c9d0e1f2a3b4c5d6e7f8091a2b3c4d5e6f708192a3b4c5d", { "tracer": "callTracer" }],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://shared.ap-southeast-1.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'debug_traceBlockByHash',
    params: ['0x9f2b4c1d7e3a6084b5c9d0e1f2a3b4c5d6e7f8091a2b3c4d5e6f708192a3b4c5d', { tracer: 'callTracer' }],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://shared.ap-southeast-1.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'debug_traceBlockByHash',
        'params': ['0x9f2b4c1d7e3a6084b5c9d0e1f2a3b4c5d6e7f8091a2b3c4d5e6f708192a3b4c5d', { 'tracer': 'callTracer' }],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let response = client
        .post("https://shared.ap-southeast-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "debug_traceBlockByHash",
            "params": ["0x9f2b4c1d7e3a6084b5c9d0e1f2a3b4c5d6e7f8091a2b3c4d5e6f708192a3b4c5d", { "tracer": "callTracer" }],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": [
        {
            "txHash": "0x3c8a1f5b2d9e4076c1a8b3d5e7f9021436587a9cbdef012345678abcdef901234",
            "result": {
                "type": "CALL",
                "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
                "to": "0x4200000000000000000000000000000000000006",
                "gasUsed": "0x5208",
                "calls": []
            }
        }
    ]
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	array	Per-transaction execution traces for the block

Use Cases

• Block Tracing: Trace all transactions in a known block by hash

• Call Graphs: Extract internal calls with the callTracer

• MEV Analysis: Reconstruct ordering and internal transfers

• Debugging: Investigate failures across a block

Error Handling

Error Code	Message	Description
-32602	Invalid params	Malformed block hash or tracer options
-32601	Method not found	The debug namespace is not enabled on this endpoint

Web3 Integration

Ethers.js

ethers-example.js

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://shared.ap-southeast-1.getblock.io/<ACCESS-TOKEN>/');

const traces = await provider.send('debug_traceBlockByHash', ['0x9f2b4c1d7e3a6084b5c9d0e1f2a3b4c5d6e7f8091a2b3c4d5e6f708192a3b4c5d', { tracer: 'callTracer' }]);

Viem

viem-example.js

import { createPublicClient, http } from 'viem';

const client = createPublicClient({
  transport: http('https://shared.ap-southeast-1.getblock.io/<ACCESS-TOKEN>/')
});

const traces = await client.request({ method: 'debug_traceBlockByHash', params: ['0x9f2b4c1d7e3a6084b5c9d0e1f2a3b4c5d6e7f8091a2b3c4d5e6f708192a3b4c5d', { tracer: 'callTracer' }] });