trace_call

Executes the given call and returns a number of possible traces for it.

Parameters

  1. Object - Call options, same as eth_call.
    • from: Address - (optional) 20 Bytes - The address the transaction is send from.
    • to: Address - (optional when creating new contract) 20 Bytes - The address the transaction is directed to.
    • gas: Quantity - (optional) Integer formatted as a hex string of the gas provided for the transaction execution. eth_call consumes zero gas, but this parameter may be needed by some executions.
    • gasPrice: Quantity - (optional) Integer formatted as a hex string of the gas price used for each paid gas.
    • value: Quantity - (optional) Integer formatted as a hex string of the value sent with this transaction.
    • data: Data - (optional) 4 byte hash of the method signature followed by encoded parameters. For details see Ethereum Contract ABI.
  2. Array - Type of trace, one or more of: "vmTrace", "trace", "stateDiff".
  3. Quantity or Tag - (optional) Integer of a block number, or the string 'earliest' or 'latest'.

Returns

  • Array - Block traces


Request

curl https://eth-mainnet.alchemyapi.io/v2/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"method":"trace_call",
    "params":[{
      "from": "0x6f1FB6EFDf50F34bFA3F2bC0E5576EdD71631638",
      "to": "0x1E0447b19BB6EcFdAe1e4AE1694b0C3659614e4e",
      "value": "0x0",
      "data": "0xa67a6a45000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000"},
      ["trace"]],
    "id":1,
    "jsonrpc":"2.0"}'
URL: https://eth-mainnet.alchemyapi.io/v2/your-api-key
RequestType: POST
Body: 
{
    "jsonrpc":"2.0",
    "method":"trace_call",
    "params":[{
        "from": "0x6f1FB6EFDf50F34bFA3F2bC0E5576EdD71631638",
        "to": "0x1E0447b19BB6EcFdAe1e4AE1694b0C3659614e4e",
        "value": "0x0",
        "data": "0xa67a6a45000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000"},    
    },["trace"]],
    "id":1
}

Response

{
  "jsonrpc": "2.0",
  "result": {
    "output": "0x",
    "stateDiff": null,
    "trace": [
      {
        "action": {
          "callType": "call",
          "from": "0x6f1fb6efdf50f34bfa3f2bc0e5576edd71631638",
          "gas": "0x1dcd11f8",
          "input": "0xa67a6a45000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000",
          "to": "0x1e0447b19bb6ecfdae1e4ae1694b0c3659614e4e",
          "value": "0x0"
        },
        "error": "Reverted",
        "subtraces": 0,
        "traceAddress": [],
        "type": "call"
      }
    ],
    "vmTrace": null
  },
  "id": 0
}
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