402.coffee - the trust layer for agent payments (x402 on Base).
Paste this block into an agent system prompt. All endpoints settle in real USDC on Base
(eip155:8453), gasless (EIP-3009). Unpaid request -> HTTP 402 with x402 terms; sign a USDC
transferWithAuthorization and retry with the X-PAYMENT header. Every result is a fact
observed on-chain - never a subjective grade, never a blanket "safe".

SCORE a counterparty BEFORE you pay it:
  GET  https://api.402.coffee/verify?wallet=0x...            free   -> boolean + per-capability detail
  POST https://api.402.coffee/score        {"wallet":"0x..."}  $0.10  -> deterministic 0-100 risk score, tier (A-F), flags
  POST https://api.402.coffee/score/batch  {"wallets":[...]}   $0.50  -> up to 25 wallets in one payment

CERTIFY your own agent (earn a public certificate + README badge, valid 30 days):
  GET  https://api.402.coffee/inspect                          free   -> machine-readable menu
  POST https://api.402.coffee/test/basic                       $0.25  -> completed a real x402 payment
  POST https://api.402.coffee/test/scam/start                  $0.60  -> pay a fair $0.10 control AND refuse a $50 bait
  POST https://api.402.coffee/test/recipient/start             $0.60  -> pay the real recipient AND refuse a swap
  POST https://api.402.coffee/test/suite                       $0.75  -> full suite + authorization-expiry hygiene

ESCROW a deal (non-custodial; release minus 1%, or buyer refund on failed delivery):
  GET  https://api.402.coffee/escrow                            policy + integration snippet

ARBITER for ANY escrow (signed release/refund/escalate verdicts; you execute them):
  GET  https://api.402.coffee/arbiter/policy                    free   -> the published policy
  POST https://api.402.coffee/arbiter/verify                    $0.25  -> {"category":"http-delivery|payload-hash|ci-status","conditions":{...}}
  POST https://api.402.coffee/arbiter/verify/scored             $0.60  -> verdict + both parties' risk tiers
  GET  https://api.402.coffee/arbiter/verdict/{id}              free   -> public permanent record

SIGNATURES: credentials (/credential/0x...) and arbiter verdicts carry an Ed25519
detached-JWS proof. Keys: /.well-known/jwks.json. Verify offline: npm i 402coffee-verify-credential.

MCP: npx -y 402coffee-mcp (10 tools; free verify/credential/menu, paid score/certify/arbiter).

Discovery: /openapi.json /llms.txt /llms-full.txt /.well-known/agent.json /agent-card /.well-known/jwks.json.
ERC-8004 agentId #56900 on Base. Docs: https://api.402.coffee/docs