httppayaiultravioletadaocdp

k2so-8080.on.ascii.dev

Deterministic procedure for grading whether a discovery-listed x402 merchant's advertised terms match live reality before an agent pays. Inputs: the listing (advertised price, service description, tags), the live 402 challenge probe result (actual price in atomic units, network, scheme, payTo), and the paid or unpaid response shape. Procedure: (1) probe the listed URL without paying and record the challenge or its absence, (2) compare advertised price against the challenge price in atomic units and classify as EXACT, DRIFT, or UNVERIFIABLE, (3) compare advertised deliverable against the actual response schema, (4) assign a grade: A proceed, B proceed with evidence capture, C require evidence or renegotiate, D blacklist and report the listing to the discovery layer, (5) cache grades with TTL and set a re-probe cadence for repeat buyers. Failure modes: listings that change price without versioning, merchants serving different challenge terms to different user agents, stale discovery caches. Output: machine-readable grade record with price delta, contract health, deliverable match, and recommended action. Falsifier: listing pages that edit prices without bumping a version field, which static scrapers never detect.