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POST
debug_traceTransaction
curl --request POST \
  --url https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "debug_traceTransaction",
  "params": [
    "0xffdc2accc3eae1263a9f6acdaba3d401865822f22cb3194eece4641a4c7fa133",
    {
      "tracer": "callTracer"
    }
  ]
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {}
}
Monad API method that returns a detailed trace of a transaction’s execution. This method provides step-by-step execution information, which is essential for debugging failed transactions and understanding contract behavior.
Monad-specific behavior:
  • The trace options object parameter must be explicitly provided. Unlike standard EVM clients where this parameter is optional, Monad RPC will return an error (-32602 Invalid params) if the parameter is omitted. Always include the trace options, even if empty ({}).
  • When an empty trace options object {} is provided, Monad defaults to callTracer instead of struct logs, because Monad does not currently support opcode-level struct logs at the VM level.
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​
Parameters

  • data — the 32-byte hash of the transaction to trace.
  • object (optional) — the tracer options:
    • tracer — the tracer to use (e.g., callTracer, prestateTracer)
    • tracerConfig — configuration options for the tracer
    • timeout — timeout for the trace operation

​
Response

  • result — the trace result object. The structure depends on the tracer used:
    • For callTracer:
      • type — the call type (CALL, CREATE, etc.)
      • from — sender address
      • to — recipient address
      • value — value transferred
      • gas — gas provided
      • gasUsed — gas used
      • input — call data
      • output — return data
      • calls — nested calls

​
debug_traceTransaction code examples

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

const provider = new ethers.JsonRpcProvider("CHAINSTACK_NODE_URL");

async function traceTransaction() {
  const txHash = "0xffdc2accc3eae1263a9f6acdaba3d401865822f22cb3194eece4641a4c7fa133";
  const trace = await provider.send("debug_traceTransaction", [
    txHash,
    { tracer: "callTracer" }
  ]);
  console.log("Transaction trace:", JSON.stringify(trace, null, 2));
}

traceTransaction();

​
Use case

A practical use case for debug_traceTransaction is debugging failed transactions to identify the exact point of failure, or analyzing the complete call graph of complex multi-contract interactions.

Body

application/json
​
id
integer
default:1
​
jsonrpc
string
default:2.0
​
method
string
default:debug_traceTransaction
​
params
array

Response

200 - application/json

The trace result.

​
jsonrpc
string
​
id
integer
​
result
object