Quittance
№ 001 · Kite AI Hackathon 2026

HTTP 402 says paid.Quittance proves delivered.

Quittance is the missing layer between “the buyer paid” and “the seller actually delivered” — escrow, verifiable proofs, bonds, and an on-chain reputation that compounds. Built on Kite, drop-in for any x402 server.

Drop in the SDKSee the adapters

Exec-Pay-Deliver atomicity

Three legs.
One transaction.

  1. 01atomic

    Exec

    Seller executes the paid request. Result is hashed and committed.

  2. 02atomic

    Pay

    Buyer's USDC sits in escrow under a deadline — locked until proof or refund.

  3. 03atomic

    Deliver

    Quittance posts on-chain. Adapter verifies. Escrow releases in the same tx.



Quittance is the other half.

Built for the Kite agentic economy: drop-in escrow, six proof adapters, a QuittanceEvaluatorHook for ERC-8183 marketplaces, and a reputation layer agents can query on-chain.

Read the SDKReputation passports Back to top