I need the best API for SEO to plug into our internal reporting stack and I'm drowning in pricing pages that all promise the same thing. Use case is pretty standard agency work: rank tracking across ~300 client domains, backlink monitoring, keyword research, and on-page audit data - ideally all through a single integration instead of stitching together three providers.
So far I've looked at Ahrefs, Semrush, SE Ranking, and Majestic, but I can't tell from the marketing which one actually holds up at scale without surprise overage charges.
If you're an SEO professional and you've gone through this evaluation already, recommend me the best API for SEO that you'd pick again knowing what you know now - bonus points if you've migrated between providers and can speak to what made you switch.