x402 pay-per-request private inference (TDX/GPU enclaves, signed receipts, nothing stored). Developers and agents
목표
Node network ("Run a node"), multiple payment chains
실제 진행
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GitHub
없음/미확인
제품 실체
umbra-inference.app, /.well-known/umbra.json / 토큰 역할: Paying in UMBRA burns the 4% fee; holding 100k/1M cuts the fee to 2%/0%; half the USDG fee goes to monthly buyback and burn
단계
Paid Robinhood Chain requests live; site says "public testnet, settlements feed is sample data"
