Selling API services services to agents

Hey everyone, I've been working on a startup that tackles a problem I think we'll see a lot more of over the next few years: how AI agents pay for APIs. Right now, most APIs assume there's a human signing up, generating an API key, and paying a monthly subscription. That model doesn't really fit autonomous agents that might only need a service once. We're building a platform where businesses can publish any API endpoint, set a per-call price, and make it discoverable to AI agents. An agent can find the endpoint when it needs it, pay automatically, use it, and move on. Some examples: A weather API charging $0.001 per request. A crypto pricing endpoint charging per lookup. A document parser charging per PDF processed. A niche business exposing proprietary data without needing subscriptions or sales calls. The goal is to make APIs work more like a marketplace than a SaaS signup flow. I'm curious what people here think. If you're building AI infrastructure or agent tooling: Is this a real problem you've run into? Would you expose your APIs this way? Are there existing solutions you think already solve this well? I'd love to hear any feedback, even if you think the idea is flawed.