Hook0

About Hook0

Hook0 is a webhooks-as-a-service platform that handles the outbound side of an API product: registering subscriber endpoints, signing payloads, delivering events, retrying failures and giving both you and your customers a readable delivery log. Building that infrastructure in-house is a common trap — the first version is a POST in a background job, and the eventual version has to handle exponential backoff, replay protection, HMAC signatures, per-subscriber rate limits and a self-serve UI where customers can debug their own missed events. Hook0 ships that as a service with a REST API, SDKs and an MCP-native interface so agent-driven workflows can manage subscriptions directly. Its main differentiators against the incumbents in this space are jurisdiction and licensing: the managed service is hosted in the EU, which matters for teams with data-residency obligations, and the platform is source-available under SSPL-1.0 so self-hosting is a real option rather than an enterprise upsell. The company states plainly that it is bootstrapped and has taken no venture capital, and publishes feature-by-feature comparisons against Svix, Hookdeck and Convoy alongside a migration path from webhook.site for teams moving production traffic. A set of free webhook testing tools is available without an account, and the documentation covers events, subscriptions, authentication, delivery debugging and endpoint hardening in the same place as the API reference.

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