Hook0

Open-source webhooks-as-a-service — send one API call, and it handles delivery, retries, and security for you.

hook0.com

Verified API available Free tier

Quick facts
What is it	Open-source webhooks-as-a-service — send one API call, and it handles delivery, retries, and security for you.
Pricing	Freemium — from €59/mo
Free tier	Yes
Platform	Web Application
API	Yes
Best for	real-time application notifications, replacing inefficient polling systems
Domain registered	2020

Data updated Aug. 1, 2026

What does Hook0 do?

Hook0 is a developer tool that manages the entire process of sending webhooks for your application. Instead of building and maintaining your own system for HTTP callbacks, you send a single API call to Hook0. It then takes over, ensuring the webhook is delivered to your user's endpoint, retrying if it fails, and securing the transmission. This saves developers from writing complex code for queuing, retry logic with exponential backoff, and TLS security.

The tool stands out because it is fully open-source, which means you can inspect the code, avoid vendor lock-in, and even self-host it. It provides a JSON REST API, SDKs, and an MCP server for AI assistants to make integration simple. Key technical features include cryptographic signing to prevent forgery, detailed logs of every delivery attempt, and a subscriber portal where end-users can manage their webhook subscriptions.

Hook0 is ideal for development teams building SaaS products, internal tools, or any application that needs to send reliable notifications to other systems. Use cases include sending real-time alerts from an e-commerce platform, syncing data between services without inefficient polling, and providing customers with a self-service way to connect your app to tools like Zapier.

Development — Other

#api#developer tools#notifications#open source#real-time#saas#webhooks

Key features

What makes it stand out

Fully open-source code for transparency and self-hosting

Manages all webhook delivery, retries, and TLS security

Cryptographic signatures prevent forgery and replay attacks

Provides a subscriber portal for end-users to manage webhooks

Detailed logs for every webhook delivery attempt for debugging

Who is Hook0 for?

Who benefits most from this tool

real-time application notifications

replacing inefficient polling systems

self-service customer integrations

Pricing

Free tier available — start without a credit card

Developer

Free

1 developers
10 event types
1 applications
10 subscriptions
100 events per day
7 data retention days
Fully managed, no infra. to own
Community support
No credit card required

Startup

€59.0/month

Everything in Developer, plus:

5 developers
100 event types
5 applications
100 subscriptions
10,000 events per day
30 data retention days
Everything in Developer
Priority support
Custom subdomain
Branded portal
Webhooks signature
Webhooks logs
Webhooks replay
Webhooks search
Webhooks filtering
Webhooks retries
Webhooks notifications

Business

€299.0/month

Everything in Startup, plus:

20 developers
1,000 event types
20 applications
1,000 subscriptions
100,000 events per day
90 data retention days
Everything in Startup
Dedicated support
SLA
Custom data retention
Custom event types
Custom subscriptions
Custom applications
Custom developers

Enterprise

Custom

Everything in Business, plus:

Everything in Business
Dedicated instance
Custom SLA
Custom features
Custom support
Custom data retention
Custom event types
Custom subscriptions
Custom applications
Custom developers

Trust & presence

Domain Domain registered 2020

Gallery

Click any image to enlarge

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