What's A Reliable Free Tool For Keeping API Tests In Sync As The API Changes?

I maintain a backend with a fairly large API surface, and the test suite keeps drifting out of sync with the actual endpoints. Every time someone ships a change, half the tests break and a few silently pass when they shouldn't be. Writing and maintaining them by hand isn't scaling anymore.

I've been looking into free API testing tools that can generate tests from real API traffic instead of making you author every case manually. Curious what people are actually running in production, which of these free API testing tools hold up at scale, and how much setup it takes to slot one into an existing CI pipeline.

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