Machine: latest.json · seller-side: seller-side.json · per-host door: /api/x402-trust-seller?host=
Verification is free. Paid step: the x402 catalog — commission_card / art50 / rwa / evidence-bundle / the signed feed door. GET /api/x402.
A signed card of their rows' verified counts, metered as MCP commission_card (GET /api/request-attestation?subject=<host>). A 402 challenge is a demo, not a sale. Payment never mints a MEASURED cell.