trace_call

​

Parameters

• from - string - The address the transaction is sent from
• to - string - The address the transaction is directed to
• gas - string - The gas provided for the transaction execution, encoded as hexadecimal
• gasPrice - string - The gas price for each paid gas, encoded as hexadecimal
• value - string - The value sent with this transaction, encoded as hexadecimal
• data - string - The call data: the 4-byte function selector followed by the ABI-encoded parameters

• trace - string - To get the basic trace of the given call
• stateDiff - string - To get information on altered state due to execution of the given call
• vmTrace - string - To get a full trace of the virtual machine’s state during execution

• earliest - For the earliest/genesis block
• latest for the latest mined block
• safe for the most recent secure block
• finalized for the most recent secure block accepted by more than 2/3 of validators

​

Returns

• output - string - The data returned as output encoded in hexadecimal format
• stateDiff - object - The altered Ethereum 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

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
      "output": "0x0000000000000000000000000000000000000000000000000000000000000001",
      "stateDiff": null,
      "trace": [
        {
          "type": "call",
          "action": {
            "from": "0x956f9835ed55f501d7583a9c27bf2645526ca155",
            "callType": "call",
            "gas": "0x2fa9c18",
            "input": "0x70a08231000000000000000000000000956f9835ed55f501d7583a9c27bf2645526ca155",
            "to": "0x4200000000000000000000000000000000000006",
            "value": "0x0"
          },
          "result": {
            "gasUsed": "0x8a2e",
            "output": "0x0000000000000000000000000000000000000000000000000000000000000001"
          },
          "subtraces": 0,
          "traceAddress": []
        }
      ],
      "vmTrace": null
    }
  }

curl https://mainnet.base.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"trace_call","params":[{"from":"0x956f9835ed55f501d7583a9c27bf2645526ca155","to":"0x4200000000000000000000000000000000000006","data":"0x70a08231000000000000000000000000956f9835ed55f501d7583a9c27bf2645526ca155"},["trace"],"latest"],"id":1}'