---
title: TransactionEvent
description: TransactionEvent describes an event emitted during transaction execution.
source_url:
  html: https://thru.org/docs/api-ref/grpc/messages/thru/core/v1/transaction-event/
  md: https://thru.org/docs/api-ref/grpc/messages/thru/core/v1/transaction-event.md
---

# TransactionEvent

TransactionEvent describes an event emitted during transaction execution.

**Package:** `thru.core.v1`

## Fields

| Field | Type | # | Description |
| - | - | - | - |
| `event_id` | `string` | 1 · optional | |
| `call_idx` | `uint32` | 2 · optional | |
| `program_idx` | `uint32` | 3 · optional | |
| `program` | [`thru.common.v1.Pubkey`](https://thru.org/docs/api-ref/grpc/messages/thru/common/v1/pubkey.md) | 4 · optional | |
| `payload` | `bytes` | 5 · optional | |