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Collect2 — Create an API endpoint to test, automate, and connect webhooks. Free plan allows for two datasets, 2000 records, 1 forwarder, and 1 alert. - Source: dev.to / almost 3 years ago
Webhook.site - Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
WireMock - WireMock - a web service test double for all occasions.
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
Mockable - Quickly define some REST or SOAP endpoints and have them return json/xml (dummy) data.
Request inspector - Debug web hooks, http clients