Crosspeel pays machine-payable API endpoints and records what comes back - certificate issuers, header order, field names, error strings, timing, and price.

Endpoints that share an origin agree on details their operators never thought to vary. Crosspeel finds those agreements and publishes them, with the evidence and the price difference attached.

This does not observe ownership, contracts, or intent. It observes responses. Where two endpoints respond identically and price differently, that is what gets published, and the operators are invited to dispute it.