Call

Trace a contract call

This endpoint enables clients to create a tracer for a specific vechain function call.

You can customize the tracer using various options to suit your debugging requirements.

POSThttps://vet.nownodes.io/debug/tracers/call

Query parameters

Body

application/json

namenullable enum

The name of the tracer. An empty name stands for the default struct logger tracer.

Example: "prestate"

4bytecallnoopprestateunigrambigramtrigramevmdisopcount

confignullable object

The configuration of the tracer. It is specific to the name

valuestring

The amount of token to be transferred.

Example: "0x47ff1f90327aa0f8e"

datastring

The input data for the contract call.

Example: "0xa9059cbb0000000000000000000000000f872421dc479f3c11edd89512731814d0598db5000000000000"

tonullable string

The recipient of the call. Null indicates contract deployment.

Example: "0x0000000000000000000000000000456e65726779"

Pattern: ^0x[0-9a-f]{40}$

gasnullable integer (uint64)

The maximum allowed gas for execution.

Example: 21000

gasPricenullable string

The absolute gas price.

Example: "1000000000000000"

callernullable string

The caller's address (msg.sender).

Example: "0x6d95e6dca01d109882fe1726a2fb9865fa41e7aa"

Pattern: ^0x[0-9a-f]{40}$

provedWorknullable string

The transaction's proved work (for extension contract).

Example: "1000"

gasPayernullable string

The address of the gas payer (for extension contract).

Example: "0xd3ae78222beadb038203be21ed5ce7c9b1bff602"

expirationnullable integer (uint32)

The transaction expiration (for extension contract).

Example: 1000

blockRefnullable string

The block reference (for extension contract).

Example: "0x00000000851caf3c"

Response

200400

OK

Body

application/json

object

The response will depend on the type of tracer you have created.

Request

JavaScriptCurlPython

const response = await fetch('https://vet.nownodes.io/debug/tracers/call', {
    method: 'POST',
    headers: {
      "Content-Type": "application/json"
    },
    body: JSON.stringify({
      "value": "0x0",
      "to": "0x0000000000000000000000000000456E65726779",
      "data": "0xa9059cbb0000000000000000000000000f872421dc479f3c11edd89512731814d0598db50000000000",
      "gas": 50000,
      "gasPrice": "1000000000000000",
      "caller": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
      "provedWork": "1000",
      "gasPayer": "0xd3ae78222beadb038203be21ed5ce7c9b1bff602",
      "expiration": 1000,
      "blockRef": "0x00000000851caf3c"
    }),
});
const data = await response.json();

Response

400

Invalid request body