trace

trace_call

Executes a call and returns the requested traces. This is similar to eth_call but with tracing support.

Executes a call and returns the requested traces. This is similar to eth_call but with tracing support.

Parameters

#	Type	Description
1	`object`	Transaction call object.
2	`array`	Array of trace types to return.
3	`string`	Block tag (`"latest"`, `"earliest"`) or hex block number.

Transaction Call Object

Field	Type	Description
`to`	`string`	(required) Address to call.
`data`	`string`	(optional) Encoded function call data.
`from`	`string`	(optional) Sender address.
`value`	`string`	(optional) Value to send in wei (hex).
`gas`	`string`	(optional) Gas limit (hex).

Trace Types

Value	Description
`"trace"`	Returns the call tree trace.
`"vmTrace"`	Returns a full VM execution trace (opcodes, stack, memory).
`"stateDiff"`	Returns the state changes made by the call.

Multiple trace types can be requested simultaneously, e.g., ["trace", "stateDiff"].

Returns

Field	Type	Description
`trace`	`array`	Call tree trace (if requested).
`vmTrace`	`object`	VM execution trace (if requested).
`stateDiff`	`object`	State changes per address (if requested).
`output`	`string`	Return value of the call.

Example

curl -s -X POST https://rpc.pulsechain.box \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "trace_call",
    "params": [
      {
        "to": "0x2b591e99afE9f32eAA6214f7B7629768c40Eeb39",
        "data": "0x70a08231000000000000000000000000000000000000000000000000000000000000dead"
      },
      ["trace"],
      "latest"
    ],
    "id": 1
  }'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "trace": [
      {
        "action": {
          "callType": "call",
          "from": "0x0000000000000000000000000000000000000000",
          "gas": "0x2fa9e78",
          "input": "0x70a08231000000000000000000000000000000000000000000000000000000000000dead",
          "to": "0x2b591e99afe9f32eaa6214f7b7629768c40eeb39",
          "value": "0x0"
        },
        "result": {
          "gasUsed": "0x...",
          "output": "0x..."
        },
        "subtraces": 0,
        "traceAddress": [],
        "type": "call"
      }
    ],
    "output": "0x..."
  }
}

TRY IT

Notes

This does not create a transaction on-chain; it simulates the call.
vmTrace produces very large responses and should be used sparingly.
stateDiff shows the before and after values for all storage slots and balances modified by the call.
All trace requests are routed to a an archive node with full trace support.

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trace_block

Returns all traces created during execution of all transactions in a block. This uses the OpenEthereum trace format.

trace_replayBlockTransactions

Replays all transactions in a block and returns the requested traces for each transaction.