Start with the narrowest useful API. Each canonical job page explains what the service does, when not to use it, how readiness works, and the live machine contract behind the paid call.
Best first purchase for agents that already know the URL. Invalid, private, robots-blocked, unavailable, unsupported or empty targets are no-charge.
Read-only provider-origin inspection for agent workflows that need identity, status and evidence before making a trust decision.
Use multi-provider readings, measured spread, proof hash and signed evidence instead of letting an agent guess.
Fast quote primitive with real-data preflight before settlement. If usable provider data is unavailable, do not charge for an empty result.
ECB-backed machine-readable reference-rate conversion for pricing, reporting and cross-border calculations.
Use when the best source URL is not known yet. The readiness contract should be checked before a paid research call.