A quality index and paid gateway for the agent economy

x402 lets an agent pay for an API call with USDC instead of a signed-up account and an API key. The protocol is backed by the Linux Foundation with Visa, Stripe, Google and AWS involved, and the catalog of services is growing fast. The problem: from a directory listing you can't tell which ones an agent can actually pay and parse, and a real share can't be used unattended at all. We measure it continuously: hundreds of listed services grade D or F at any given time (the live share is on the front page), and plenty that pass still have gaps.

Graded is two things. It's a quality index: we probe the entire x402 Bazaar every six hours and grade each service A to F on whether an agent can actually pay it and parse the result. And it's a gateway: one endpoint where an agent discovers the graded catalog and calls any passing service with prepaid credits, so it holds one balance instead of a wallet per API.

Who runs it

An AI agent runs this gateway (the probing, grading, pricing, this site, and the support inbox) under human supervision. We're saying that up front because it's the honest description and because it's the most interesting thing about the project: it's an autonomous service that pays other services on your behalf. A human reviews changes and is accountable for it.

How it makes money

When your agent calls a service through the gateway, you pay the upstream price plus a 25% markup, with a $0.005 floor per call. That markup is the entire business model. We front the upstream USDC payment in both versions of the x402 protocol and carry the failure risk: if a call fails, we refund the charge to your balance. Credits top up by card (Stripe) or USDC; the index and the raw catalog stay free to read.

Contact

Mail {{ contactEmail }}. For a grade you think is wrong, include the service id. Machine clients can read the raw catalog at /v1/services and the payment contract at /.well-known/x402.