debug_traceTransaction - Celo

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

This method returns a detailed trace of a transaction's execution on the Celo network. This is essential for debugging failed transactions, analyzing gas usage, and understanding contract interactions.

Parameters

Parameter	Type	Required	Description
transactionHash	string	Yes	32-byte transaction hash
options	object	No	Tracer configuration options

Options Object

Field	Type	Description
tracer	string	Tracer type: "callTracer", "prestateTracer"
tracerConfig	object	Tracer-specific configuration
timeout	string	Maximum trace duration

Request Example

cURL

cURL

curl -X POST https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/ \
-H "Content-Type: application/json" \
-d '{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "method": "debug_traceTransaction",
  "params": [
    "0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b",
    {"tracer": "callTracer"}
  ]
}'

Axios

request.js

const axios = require('axios');

const url = 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/';

const payload = {
  jsonrpc: '2.0',
  id: 'getblock.io',
  method: 'debug_traceTransaction',
  params: [
    '0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b',
    { tracer: 'callTracer' }
  ]
};

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

request.py

import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = {
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "method": "debug_traceTransaction",
    "params": [
        "0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b",
        {"tracer": "callTracer"}
    ]
}

response = requests.post(url, headers={"Content-Type": "application/json"}, json=payload)
print(json.dumps(response.json(), indent=2))

Response Example (callTracer)

response.json

{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "result": {
    "type": "CALL",
    "from": "0x742d35cc6634c0532925a3b844bc9e7595f8bb45",
    "to": "0x765de816845861e75a25fca122bb6898b8b1282a",
    "value": "0x0",
    "gas": "0x5208",
    "gasUsed": "0x5208",
    "input": "0xa9059cbb...",
    "output": "0x0000000000000000000000000000000000000000000000000000000000000001",
    "calls": []
  }
}

Response Definition

Field	Type	Description
result	object	Detailed execution trace

Use Cases

• Debug failed transactions

• Analyze internal calls

• Track gas consumption

• Understand contract interactions

• Debug cUSD/cEUR transfers

Error Handling

Error Code	Description
-32602	Invalid params - malformed hash
-32603	Internal error
-32000	Transaction not found

SDK Integration

Ethers.js

ethers.js

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

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

const trace = await provider.send('debug_traceTransaction', [
  '0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b',
  { tracer: 'callTracer' }
]);
console.log(JSON.stringify(trace, null, 2));