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–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.