We got burned by silent API changes twice this year. how do you handle this?

Our team builds on a Next.js stack and depends on a handful of third-party APIs some AI providers, some infrastructure, some data services. Twice this year, we got user complaints before we even knew something was broken. The culprit both times? Silent breaking changes from upstream APIs. Once it was a renamed field in a response object. Another time, a deprecated endpoint that stopped returning data the way we expected. We weren't monitoring changelogs actively. Nobody on the team had time to read through every API provider's release notes. And by the time the breakage surfaced, it had already affected real users. It got me thinking, this must happen to other teams too, especially now that most startups are stitching together 5-10 APIs just to ship their core product. AI-native teams have it even worse, model versions deprecate fast, output formats change, endpoints get retired. So I'm genuinely curious: How do you stay ahead of breaking changes from APIs you depend on? Do you monitor