debug_traceCall - BSC

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

The debug_traceCall method lets you run eth_call with tracing on the BNB Smart Chain. This is useful for simulating and debugging contract calls without sending a transaction.

Parameters

Parameter

Type

Required

Description

transaction

object

Yes

Transaction call object

blockNumber

string

Yes

Block number or "latest"

options

object

Tracer options

Request Example

cURL

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": "0x55d398326f99059fF775485246999027B3197955",
        "data": "0x70a08231000000000000000000000000742d35cc6634c0532925a3b844bc9e7595f8bb45"
    }, "latest", {"tracer": "callTracer"}],
    "id": "getblock.io"
}'

request.js

const axios = require('axios');

const url = 'https://go.getblock.io/<ACCESS-TOKEN>/';

const payload = {
    jsonrpc: '2.0',
    method: 'debug_traceCall',
    params: [{
        to: '0x55d398326f99059fF775485246999027B3197955',
        data: '0x70a08231000000000000000000000000742d35cc6634c0532925a3b844bc9e7595f8bb45'
    }, 'latest', { tracer: 'callTracer' }],
    id: 'getblock.io'
};

axios.post(url, payload, {
    headers: { 'Content-Type': 'application/json' }
})
.then(response => console.log(JSON.stringify(response.data, null, 2)))
.catch(error => console.error(error));

request.py

import requests

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

payload = {
    "jsonrpc": "2.0",
    "method": "debug_traceCall",
    "params": [{
        "to": "0x55d398326f99059fF775485246999027B3197955",
        "data": "0x70a08231000000000000000000000000742d35cc6634c0532925a3b844bc9e7595f8bb45"
    }, "latest", {"tracer": "callTracer"}],
    "id": "getblock.io"
}

response = requests.post(url, headers={"Content-Type": "application/json"}, json=payload)
print(response.json())

main.rs

use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    
    let payload = json!({
        "jsonrpc": "2.0",
        "method": "debug_traceCall",
        "params": [{
            "to": "0x55d398326f99059fF775485246999027B3197955",
            "data": "0x70a08231..."
        }, "latest", {"tracer": "callTracer"}],
        "id": "getblock.io"
    });

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);
    
    Ok(())
}

Response Example

response.json

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "from": "0x0000000000000000000000000000000000000000",
        "gas": "0x17d7840",
        "gasUsed": "0x5d9b",
        "to": "0x55d398326f99059ff775485246999027b3197955",
        "input": "0x70a08231000000000000000000000000742d35cc6634c0532925a3b844bc9e7595f8bb45",
        "output": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "value": "0x0",
        "type": "CALL"
    }
}

Response Parameters

Parameter

Type

Description

type

string

Call type

gasUsed

string

Gas consumed

output

string

Return data

Use Cases

Simulate contract calls
Debug before sending transactions
Analyze call traces
Test contract interactions

Error Handling

Error Code

Description

-32602

Invalid params

-32603

Internal error

SDK Integration

ethers.js

const { ethers } = require('ethers');

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

const trace = await provider.send('debug_traceCall', [{
    to: '0x55d398326f99059fF775485246999027B3197955',
    data: '0x70a08231...'
}, 'latest', { tracer: 'callTracer' }]);
console.log(trace);

viem.js

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

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

const trace = await client.request({
    method: 'debug_traceCall',
    params: [{ to: '0x55d398...', data: '0x70a08231...' }, 'latest', { tracer: 'callTracer' }]
});

Previousdebug_storageRangeAt - BSC Nextdebug_traceTransaction - BSC

Last updated 12 days ago

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