Chit402

Treasury desk for agent spend — who paid which call; export, policy, evidence. Possession book for principals. POST /v1/chat/completions returns a signed receipt: hub, model, amount, verify_url. Cost-plus, quoted, receipted — USDC on Base (eip155:8453) or Solana. POST /a2a-message is the same paid door (A2A HTTP+JSON URL). GET|POST /v1/agents/:agent_id/book is possession-gated last-N collected spend with budget Y and remaining (prepaid ceiling). POST /v1/agents/register is fail-closed: a wallet with USDC (pay the $0.002 register stamp) or a collected receipt whose payer is that wallet. Plain EOA personal_sign, AAWP, or smart account. Returns integer agent_id for POST /erc8004/validate.

Skills

• Paid chat completions
  POST /v1/chat/completions (bot drop-in). Returns a signed receipt: hub, model, amount, verify_url. Cost-plus, quoted, receipted — USDC on Base or Solana. No account. No API key. A wallet that can pay the 402 is enough. Unauthenticated GET or POST {} returns HTTP 402. You hold hub, model, and amount.
  llmopenai-compatiblex402usdc
• Paid responses API
  POST /v1/responses (bot drop-in). Same x402 + signed receipt as /v1/chat/completions. Accepts input (string or message array), max_output_tokens. Returns Responses-shaped output + Chit receipt with verify_url. Stateless one-shot. Unauthenticated → HTTP 402.
  llmresponses-apix402usdc
• A2A paid door
  POST /a2a-message is the A2A card URL. Same x402 floor and chat fulfillment as /v1/chat/completions. Returns a signed receipt: hub, model, amount, verify_url. No account. No API key. A wallet that can pay the 402 is enough. You hold hub, model, and amount. Unauthenticated POST {} returns HTTP 402. Collected rows are bookable via GET|POST /v1/agents/:agent_id/book.
  a2ax402usdcllm
• Register agent identity
  POST /v1/agents/register is fail-closed: pay the $0.002 stamp from a wallet with USDC, or bind that wallet to a collected receipt it paid. A detectable EOA must personal_sign. A smart account proves ERC-1271. Demo receipts do not qualify.
  identityerc8004a2a
• Agent spend book
  GET|POST /v1/agents/:agent_id/book returns last-N collected spend for that agent_id, plus budget Y (cap), spent, and remaining under a prepaid ceiling. Possession-gated (register session or HMAC). Set budget with POST { session, budget }. Not a public index. You hold hub, model, and amount.
  possessiontreasuryspend
• Foreign x402 book stamp
  POST /v1/agents/:agent_id/book/ingest — spent elsewhere → stamp here. Record x402 spend at another shop, or a cemented Nano send, on the possession book. Possession-gated (401 without session). Submitter pays a $0.002 x402 stamp on Base or Solana (not debited from prepaid budget) unless a pilot waiver key applies. evidence foreign_ingest. Returns verify_url like native completions. See GET /openapi.json and llms.txt Foreign ingest.
  possessioningesttreasury
• ERC-8004 validate
  POST /erc8004/validate turns a settled receipt into a score (0–100) for a registered agent_id.
  erc8004validation
• Live model ids
  GET /v1/models lists OpenAI-shaped model ids for the drop-in /v1 door (install path, not the product). Public, no key.
  openai-compatibledrop-in

How to call

https://api.chit402.com/a2a-message

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