UTA Trust API

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Agent trust verification as a paid x402 resource: validates one Agent Trust Card (ATC/1.0) with real Ed25519 verification over the JCS-canonicalized card subtree (pinned anchors, two-sided validity window) and returns per-stage results plus a risk band. $0.01 USDC per verify ($0.08 for a 1-10 card batch) on Base mainnet (eip155:8453; Base Sepolia eip155:84532 kept for testing) via x402 v2 exact with EIP-3009 gasless settlement (mainnet: PayAI facilitator; testnet: x402.org); a call without payment gets a fail-closed 402 carrying the full challenge. Example: `POST https://uta-trust-api.eddyflores100.workers.dev/v1/trust/verify` with `{"card":{...}}` — the same URL without X-PAYMENT answers the live 402; v2 manifest and self-description at [/v1](https://uta-trust-api.eddyflores100.workers.dev/v1). ([OpenAPI](https://uta-trust-api.eddyflores100.workers.dev/openapi.json)) ([MCP](https://uta-trust-api.eddyflores100.workers.dev/mcp)) ([GitHub](https://github.com/alicelabs-llc/universal-trust-adapter))