Groundcheck

A human read this entry. That is the one thing true of everything on the list. Beyond that: the endpoint answered an x402 request when we knocked it, on the date shown. That date is the claim — not a word, a date. None of it is a delivery test. We have not paid for this and graded what came back, so read it as "we checked what is stated above," never as "this is worth the money."

Claim grounding and delivery attestation for AI agents: machine-verified verdicts (supported/refuted/unverified) with confidence scores and cited sources, plus signed offline-verifiable receipts binding an x402 payment to what was delivered. Free single-claim tier; paid endpoints $0.005–$0.05 USDC on Base. ([OpenAPI](https://groundcheck.seiche.info/openapi.json)) ([npm](https://www.npmjs.com/package/groundcheck-mcp))