API docs and testing
Generate API docs, mock and test APIs, keep specs in one place. 5 resources; API, key, license and embedding quoted from each site's own pages, checked Oct 24, 2026.
Hookdeck
Webhooks from Stripe, Shopify or GitHub stop getting lost when your server is down or flooded, because they are queued, rate-limited and replayable instead of hitting your app directly.
APIFree tierCommercial OK
Theneo
Your API reference, guides and changelog stay in one place that engineers, writers and coding agents edit together, so the docs stop drifting away from the API.
APIFree tierCommercial OK
Octri
It keeps docs, SDKs and an MCP server in sync with one spec, so you stop hand-maintaining client libraries in several languages every time an endpoint changes.
Free tierCommercial OK
FetchSandbox
It targets the integration bugs normal CI misses, like a webhook delivered twice or a provider timing out, without pointing tests at a live provider account.
APIFree tierCommercial OK
Routebase
Docs, mocks and tests are generated from the same spec, so changing an endpoint once updates all of them instead of letting separate copies drift apart.
APIFree tierCommercial OK
Side by side
| Resource | API | Key | Data download | Commercial use | Embed |
|---|---|---|---|---|---|
| Hookdeck Hosted webhook infrastructure: an Event Gateway that receives inbound webhooks, queues, filters, transforms, retries and routes them to your API with logs and replay, Outpost for sending webhooks to your own customers, and a CLI that forwards webhooks to localhost. |
Official API · Free tier | Yes | — | Commercial use OK | Embedding unclear |
| Theneo A hosted API documentation platform that turns an OpenAPI, AsyncAPI, GraphQL, gRPC or SOAP spec into a published API reference with guides, an API explorer, auto-generated changelogs, AI search and private per-customer portals, managed from a web editor, CLI, TypeScript SDK or MCP server. |
Official API · Free tier | Yes | — | Commercial use OK | Embedding unclear |
| Octri A hosted service that takes an OpenAPI spec (file, URL or GitHub repo) and produces a documentation site with a request playground, client SDKs in ten languages published to npm, PyPI and other registries, an MCP server for the API, and error monitoring that the generated SDKs can report into. |
API unclear | — | — | Commercial use OK | Embedding unclear |
| FetchSandbox A testing service, driven from a coding agent through MCP or a CLI, that runs your third-party API integration (payments, webhooks and similar) against simulated provider 'twins', injects failures such as retries, duplicate or late requests, proposes fixes and returns a receipt of what was checked. |
Official API · Free tier | Yes | — | Commercial use OK | Embedding unclear |
| Routebase A hosted API-lifecycle tool built around one OpenAPI spec: a visual spec editor with branches and merge requests, mock servers, declarative test suites and OWASP API scans, published docs portals and uptime/contract monitors, all driven from the web app, a CLI, a REST API or an MCP server. |
Official API · Free tier | Yes | — | Commercial use OK | Embedding unclear |