Freedom251 › Webhook Management Software

WebhookInbox

Paid APISelf-hostedWeb

What WebhookInbox is

WebhookInbox is a free, open-source tool for receiving HTTP requests and examining them later, including while debugging HTTP callbacks. Each inbox receives a generated URL that applications can call to submit requests. New data appears on the website in real time, and stored items can show the method, path, query, headers, body, creation time, and client IP address. Its REST API can create and destroy inboxes, retrieve captured items, and listen for new arrivals. Monitoring supports HTTP long polling and HTTP streaming. An inbox can send an automatic response or wait for a custom one; without a custom response within 20 seconds, the request receives status 503. Inboxes normally retain up to 100 items, may temporarily hold more during rapid bursts, and then truncate back to 100. They expire after their time-to-live unless refreshed and can also be destroyed explicitly. URLs can serve as PubSubHubbub callbacks. Fanout, Inc. produces WebhookInbox, and says users can run their own instance. It is built with Django, Redis, Pushpin, and AngularJS.

Who it suits

WebhookInbox suits developers inspecting webhook traffic, debugging HTTP callbacks, or monitoring incoming events through an API. Its open-source, self-hosted availability also suits teams wanting to run their own instance.

What it does well

Generated URLs capture requests from other applications
Incoming request data appears in real time
REST API manages inboxes and captured items
Supports long polling and HTTP streaming
Open source with self-hosting supported

What to know first

Each inbox normally stores only 100 items
Inboxes expire when their time-to-live ends
No custom response within 20 seconds returns 503

Verdict

WebhookInbox provides a focused way to capture and inspect HTTP requests through a browser or API. Its retention cap, expiration behavior, and response timeout are important when planning debugging or event-monitoring workflows.

Facts from WebhookInbox's own pages

API: The HTTP API can create and destroy inboxes, retrieve items, and listen for new items in realtime. · webhookinbox.com, 11 Oct 2026
Captured data: Request items can include the method, path, query, headers, body, creation time, and client IP address. · webhookinbox.com, 4 Oct 2026
Captured request details: Request items can include the method, path, query, headers, body, creation time, and sender IP address. · webhookinbox.com, 11 Oct 2026
Custom responses: Inboxes can be configured to wait for a user supplied HTTP response; if none arrives within 20 seconds, the request receives status 503. · webhookinbox.com, 11 Oct 2026
Expiration: Inboxes expire after their time-to-live unless refreshed, and can also be explicitly destroyed. · webhookinbox.com, 4 Oct 2026
Generated inboxes: Each inbox has a generated URL that applications can use to send requests for capture. · webhookinbox.com, 4 Oct 2026
Generated inbox URLs: Each inbox has a generated URL that other applications can use to send requests. · webhookinbox.com, 11 Oct 2026
Limits and expiration: Inboxes normally retain up to 100 items and are automatically destroyed when their time to live expires unless refreshed. · webhookinbox.com, 11 Oct 2026
Live display: Incoming request data is displayed on the website in real time. · webhookinbox.com, 4 Oct 2026
Live updates: The API supports long-polling and HTTP streaming to receive new items. · webhookinbox.com, 11 Oct 2026
Maker: WebhookInbox is produced by Fanout, Inc. · webhookinbox.com, 11 Oct 2026
Open source: WebhookInbox is open source, and the maker says users can run their own instance. · webhookinbox.com, 4 Oct 2026
PubSubHubbub: Inbox URLs can receive PubSubHubbub feed updates and handle subscription verification requests. · webhookinbox.com, 11 Oct 2026
Purpose: WebhookInbox receives HTTP requests and stores their data for later inspection, including for debugging HTTP callbacks. · webhookinbox.com, 11 Oct 2026
Realtime API: The REST API can create and destroy inboxes, retrieve items, and listen for new items in real time. · webhookinbox.com, 4 Oct 2026
Realtime viewing: Incoming request data is displayed on the website in realtime. · webhookinbox.com, 11 Oct 2026
Retention limit: An inbox holds up to 100 items, with a temporary higher limit during rapid request bursts before truncation back to 100. · webhookinbox.com, 4 Oct 2026
Self hosting: WebhookInbox is open source, and the maker says users can run their own instance. · webhookinbox.com, 11 Oct 2026
Support: The contact page directs bug reports and feature requests to its GitHub issue tracker and lists an email for commercial inquiries. · webhookinbox.com, 11 Oct 2026
Technology: The project is built with Django, Redis, Pushpin, and AngularJS. · webhookinbox.com, 11 Oct 2026

Where WebhookInbox stands on Freedom251

Webhook Management Software#29 of 29