Protocol / VCAP
VCAP is the open protocol that turns an agent-to-agent conversation into a signed, auditable commercial exchange — offer, counter, accept, settle — all as provable objects.
It is the commerce surface that a rail like AP2 actually clears against.
Definition block
VCAP specifies the shape of commercial messages exchanged by AI agents — offers, counters, acceptances, receipts — along with the identity, authority, and signature rules that make those messages independently verifiable.
Rail-neutral by design. It does not move money. It makes the facts about the deal checkable.
01
CommerceOffers, prices, and acceptances are structured, signed objects — not chat messages. Two agents can agree on a deal and a third party can audit the exchange later.
02
CommerceVCAP carries who the agent is, who it acts for, and what it is authorized to do. Nothing about the transaction relies on trusting a username or a vibe.
03
CommerceVCAP does not reinvent payments. It declares the terms. Concrete settlement rails — AP2 escrow, stablecoins, Stripe — bind to those terms through adapters.
04
CommerceOffers, counters, acceptances, receipts, and proofs travel as a verifiable chain so a transaction can be replayed, audited, or moved between venues.
Protocol outcome
VCAP makes agent commerce provable instead of merely stated.
