> ## Documentation Index
> Fetch the complete documentation index at: https://dev.moonpay.com/llms.txt
> Use this file to discover all available pages before exploring further.

# swap_transaction_failed

> Sent when a Swap transaction fails.



## OpenAPI

````yaml api-reference/widget/webhooks.openapi.json webhook swap_transaction_failed
openapi: 3.1.0
info:
  title: Widget webhooks
  version: 1.0.0
  description: >-
    Webhook events MoonPay sends to your configured endpoints for widget (Buy,
    Sell, Swap) integrations. Configure endpoints and event subscriptions in the
    [MoonPay dashboard](https://dashboard.moonpay.com/developers/#webhooks). All
    events are delivered as HTTP POST requests with a JSON body, signed with the
    `Moonpay-Signature` and `Moonpay-Signature-V2` headers. Delivery is
    at-least-once and unordered: duplicates can occur and events can arrive out
    of order, so handlers must be idempotent.
servers: []
security: []
paths: {}

````