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# trace_call

# `trace_call`

Simulates a call and returns the trace in the OpenEthereum/Parity format, without broadcasting a transaction. Similar to [`debug_traceCall`](/api/reference/debug-tracecall) but returns the OpenEthereum trace shape.

## Parameters

-   `transaction`: _[required]_ Transaction call object (`from`, `to`, `gas`, `gasPrice`, `value`, `data`).
-   `traceTypes`: _[required]_ Array of trace types to return. Valid values: `"trace"`, `"stateDiff"`. (`"vmTrace"` is not supported on `rpc.linea.build`.)
-   `blockParameter`: _[required]_ Hexadecimal block number, or `latest`.

## Returns

Object with fields corresponding to the requested trace types:

-   `output`: Hex-encoded call return data.
-   `trace`: Array of call trace objects (if `"trace"` was requested).
-   `stateDiff`: State changes caused by the call (if `"stateDiff"` was requested).

## Example

### Request

```bash
curl https://rpc.linea.build \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "trace_call",
    "params": [
      {
        "to": "0x176211869ca2b568f2a7d4ee941e073a821ee1ff",
        "data": "0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045"
      },
      ["trace"],
      "latest"
    ],
    "id": 1
  }'
```

### Response (abbreviated)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "output": "0x000000000000000000000000000000000000000000000000000000000026009c",
    "stateDiff": null,
    "trace": [
      {
        "action": {
          "callType": "call",
          "from": "0x0000000000000000000000000000000000000000",
          "to": "0x176211869ca2b568f2a7d4ee941e073a821ee1ff",
          "gas": "0xffac48",
          "input": "0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045",
          "value": "0x0"
        },
        "result": {
          "gasUsed": "0x25fe",
          "output": "0x000000000000000000000000000000000000000000000000000000000026009c"
        },
        "subtraces": 1,
        "traceAddress": [],
        "type": "call"
      }
    ]
  }
}
```