> ## Documentation Index
> Fetch the complete documentation index at: https://docs.validationcloud.io/llms.txt
> Use this file to discover all available pages before exploring further.

# trace_replayTransaction

Replays a transaction, returning the traces.

This method will use `270` [Compute Units](/nodeapi/about/billing).

***

## **Parameters**

`hash` - string - <span style={{color: "red"}}>Required</span> - The hash of a transaction

`array` - array - <span style={{color: "red"}}>Required</span> - The type of trace, which can be one of the following:

* `vmTrace` string - To get a full trace of the virtual machine's state during the execution of the given transaction, including for any subcalls
* `trace` - string - To get the basic trace of the given transaction
* `stateDiff` - string - To get information on altered Ethereum state due to execution of the given transaction

## **Returns**

`object` - object - The block trace object with the following fields:

* `output` - string - The data returned as output encoded in hexadecimal format
* `stateDiff` - object - The altered state due to execution of the given transaction, or null if not available
* `trace` - array - An array of basic trace objects for the given transaction containing:
  * `action` - object The ParityTrace action object containing call details
    * `from` - string - The address of the sender
    * `callType` - string - The type of method such as call, staticcall, delegatecall
    * `gas` - string - The gas provided by the sender, encoded as hexadecimal
    * `input` - string - The input data sent along with the transaction
    * `to` - string - The address of the receiver
    * `value` - string - The integer of the value sent with this transaction, encoded as hexadecimal
  * `result` - object - The execution result of the trace
    * `gasUsed` - string - The amount of gas used by this trace
    * `output` - string - The return value of the contract call, empty if no RETURN executed
  * `subtraces` - integer - The number of subtraces (internal calls) within this trace
  * `traceAddress` - array - The list of addresses where the call executed, including parent calls and order
  * `type` - string The type of the trace, such as call or create
* `vmTrace` - object - The full trace of the virtual machine's state during execution, including sub-calls, or null if not available

```json theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
      "output": "0x0000000000000000000000000000000000000000000000000000000000000001",
      "stateDiff": null,
      "trace": [
        {
          "type": "call",
          "action": {
            "from": "0x956f9835ed55f501d7583a9c27bf2645526ca155",
            "callType": "call",
            "gas": "0xc215a",
            "input": "0x39ecce49...",
            "to": "0x83d55acdc72027ed339d267eebaf9a41e47490d5",
            "value": "0x0"
          },
          "result": {
            "gasUsed": "0x2b76d",
            "output": "0x0000000000000000000000000000000000000000000000000000000000000001"
          },
          "subtraces": 3,
          "traceAddress": []
        }
      ],
      "vmTrace": null
    }
  }
```

<CodeGroup>
  ```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://mainnet.base.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '{"jsonrpc":"2.0","method":"trace_replayTransaction","params":["0x0c0473d2b7e4160c866367e9cc872edf78301d574a0dfe441085547f6117b985",["trace"]],"id":1}'
  ```
</CodeGroup>


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