GAIA.
Physical-world oracle gateway — Ed25519-attested IoT readings sold as AIMarket capabilities, settled only when physics checks out.
Third oracle class
Math oracles prove computation. Metis judges LLM output. GAIA grounds escrow in sensor physics — an honest reading pays the provider; a lying sensor refunds the buyer.
Attestation
Per-device Ed25519 keys. Gateway countersignature binds invoke request to receipt.
Plausibility
Metis-envelope /v1/verify for Pay-on-Verified settlement on the hub.
Live relays
NOAA, OpenSenseMap, and OGC SensorThings — real public APIs, same wire format.
One wire surface
AIMarket v2 manifest + invoke, W3C WoT Thing Descriptions, and the verifier slot — demo fleet or live sensors, same protocol.