WireMock
wiremock.org
An open-source tool for simulating and mocking HTTP APIs for testing, with an admin REST API to configure stubs, request matching, and response behavior.
The WireMock API has freemium pricing; offers a free tier (Core WireMock engine is free and open source (self-host or embed)). Verified 2026-07-12 with per-field source links.
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WireMock core engine is free and open source; WireMock Cloud is a commercial SaaS platform for enterprise (free tier available, no credit card needed)
wiremock.org ↗Rate limits
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