What API testing strategies are actually working for you in 2026?

I’ve been diving deeper into API testing lately, and honestly, most teams still seem to rely on pretty basic approaches—mainly manual testing or a few automated scripts.

But with microservices and distributed systems getting more complex, that doesn’t seem enough anymore.

From what I’ve explored, a few strategies stand out:

Testing APIs early (shift-left instead of waiting for full integration)
Combining multiple testing types (not just functional, but contract + integration too)
Using real API traffic instead of heavy mocking
Automating tests directly in CI/CD pipelines

One interesting approach I came across is using tools like Keploy that generate test cases from real API calls instead of writing everything manually. Feels like a more practical way to maintain tests at scale.

I also found a detailed breakdown of these strategies here:
https://keploy.io/blog/community/api-testing-strategies

Curious to hear from others:

What’s your current API testing setup?
Are you still writing tests manually or moving toward automation tools?
How do you handle test maintenance as APIs evolve?

Would love to know what’s actually working in real-world projects.