Jason M. Lemkin built a website that grades APIs on how well they work with AI agents, asking Claude, Gemini, and OpenAI to rate each one. Stripe got the only A+. The tool was used 1,688 times in its first week.
I, we built an AI agent API report card. I don't know if you have a tab, can show it. And we were like, listen, we're just, this isn't one-off. We're going to keep building more and more agents and more and more products on top of APIs and maybe MCPs too. And the first thing you might do is ask Claude or ChatGPT, which one should I use? Right? I want to do email marketing. Should I use Resend? I want to, I want to, you know, what should I use? And I think that's fine. I think if you just ask the LLMs, Which API is the best one for an agent? That's fine. But I thought it would be interesting to actually grade them all, to grade them all. So what we had, we built this site on Replit, API Report Card. As you can see, as we've used it, it's already been used 1,688 times in less than a week. Oh, and basically what it does, it takes every API that asks Claude, Gemini, and OpenAI to grade it based on how agent-friendly these APIs are. Okay. And then it rates them and roughly you can go through this and you can click into all of them. You can see all the details. It will explain it. You can compare them by category. Yeah, there's Slack, which came up. And if you— if there's a couple of things you can learn, if you just— the interesting thing was that kind of surprised me is Stripe got the highest grade. It got the only A+, the most agentic one. So honestly, we use Stripe a little bit at the API level. We're going to do more this year as we have most of Saastr's free. So there's only so much Stripe we need, right? But we use it a little bit. But now I would use Stripe in an instant, right? It got, it got the highest grades. If you scroll down here toward the bottom, you'll see as it fades from A to C, these overall grades, you'll see it's very consistent with our experience. Like if you go down to Marketo where the API doesn't work, right? You can find it down in the Cs or even search for it. It will explain to you if you want to build an agentic product, don't use Marketo.
