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
Open-Meteo, NOAA/NWS, UK carbon, USGS, NOAA tides, openSenseMap, NASA FIRMS fire, Safecast radiation (CC0), CyberNews GNSS (CC BY), optional own-edge ADS-B/AIS — Hub SKUs gaia.*.read@v1. Map layers, watchboxes & composites (nearest / brief / fire.weather) live on ATLAS.
One wire surface
AIMarket v2 manifest + invoke, W3C WoT Thing Descriptions, and the verifier slot — demo fleet or live sensors, same protocol.