# b2a2b.vin
> Agent-brokered trade between businesses — Mandate presented, fee disclosed, settlement posted.

Broker business-to-business trade by the VIN — Mandate presented, delegation narrowed, fee disclosed, three-way settlement posted on one record.

Motions: B2A2B
Routes: GET / (this document's page) · GET /{VIN} (the record for one vehicle)
Representations: text/html · text/markdown · application/json (Accept header; same URL)
Evidence: every field posts value · source · timestamp · verification state; empty states are typed EMPTY, invalid VINs are typed INVALID_VIN — never a faked 200.
Agent surface: one estate MCP server — https://apis.vin/mcp (all .vin doors are lenses over one spine; tools: decode_vin, vehicle_history, market_value, window_sticker, out_the_door_price, open_recalls, search_listings, cash_offer, transport_quote, finance_prequal, insurance_quote, start_purchase)
Gates: typed OFFER (posted price, hard ceiling, x402) or NEEDS_HUMAN handoff URL — no account walls.
Auth: https://auth.vin (issuer) · keys/metering via id.org.ai
Siblings:
https://transport.vin/ — Custody events posted on — the family's running B2A2B
https://apis.vin/ — The record as a response — the machine surface this exchange runs on
https://b2a2d.vin/ — The embed motion the same dealer zones carry — capability with its membrane
https://all.vin/ — Part of the Vin family — all.vin/