groundcheck

Ground claims before asserting them (verify_claim), verify a whole draft (check_citations), resolve which security a claim is about (resolve_instrument), split text into checkable atomic claims cheaply (extract_claims), and — when you PAY another service over x402 — verify what it delivered and get a signed delivery receipt binding payment to delivery to grounded content (attest_delivery), a neutral accountability trail for agentic commerce. Unlike a bare fact-checker, every answer is built to be ACTED ON programmatically: a `sufficiency` tag tells you when to abstain or escalate, a conformal `guarantee` gives a distribution-free error bound you can gate decisions on, compound claims are decomposed so a false part can't hide, and a signed `provenance` receipt binds the exact evidence and model route so you can prove to your principal how the answer was reached. Paid tools answer 402 with an x402 offer. Sibling servers from the same lab: for US money-market stress readings use Seich