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API Report Card is a free tool from SaaStr.ai that grades any B2B API for how well it works in an agent-first world. It scores APIs across categories like authentication, error handling, documentation, pagination, idempotency, and overall agent-readiness, surfaces a letter grade from F to A+, and generates ready-to-paste prompts that developers can drop into Cursor, Claude, or Replit to fix the issues.

Framer — Launch websites with enterprise needs at startup speeds.

Launch websites with enterprise needs at startup speeds.

Hey PH 👋 Excited to share API Report Card, a free tool from the team at SaaStr.ai (yes, Jason Lemkin's crew). The thesis is simple and a little uncomfortable: AI agents are about to be every API's biggest customer. Not humans clicking "Connect." Not partners doing custom integrations. Agents calling endpoints, reading errors, retrying, paginating, chaining tools. And most B2B APIs were never designed for that. They're built for a developer who can squint at a docs page and figure things out. Agents can't squint. API Report Card is a 60-second checkup for exactly this: - 🅰️ A letter grade (A+ to F) for your API - 🧪 Category-level scores: auth, errors, docs, pagination, idempotency, agent-readiness - 🛠 Ready-to-paste prompts you can drop straight into Cursor / Claude / Replit to fix what's flagged - 🆓 Free, no signup I ran it on a few APIs I work with daily. The results were… humbling. Endpoints I'd have sworn were solid scored a C. Things I'd never thought about (idempotency keys, structured error envelopes, machine-readable rate-limit headers) turned out to be the difference between an A and a flunk. A few things I'd love to hear from this community: 1. What grade did your API get? (Brave souls, drop screenshots 👇) 2. What category surprised you the most? 3. If you're building agents, which API issues bite you most often in production? Huge congrats to the SaaStr.ai team on the ship 🚀