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Universal Commerce Protocol (UCP) is an open standard for agent-driven commerce. It gives AI agents a shared way to discover merchants, build carts, start checkout, and complete payment. Prism plugs into that flow as the payment layer. It exposes the xyz.fd.prism_payment handler, generates the x402 payment requirements an agent needs, and settles the signed payment on-chain.

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How Prism Fits Into UCP

Prism makes the payment part of UCP much simpler. It handles three jobs:
  1. Advertise the payment option. Prism gives merchants a ready-to-use xyz.fd.prism_payment handler to return in their UCP profile. Supported chains, tokens, and settlement settings live in Prism Console, not in merchant code.
  2. Prepare checkout. For each order, Prism returns a complete x402 paymentRequirements object with the right token amounts, contract addresses, and chain-specific details.
  3. Settle the payment. Once the agent submits a signed credential, the merchant forwards it to Prism. Prism verifies it, settles it on-chain, and returns the transaction hash.

For Merchants

Add the Prism handler, prepare checkout sessions, and settle agent payments

For Agents

Discover UCP merchants, sign x402 payments, and complete checkout cleanly

End-to-End Flow

Follow one complete purchase from discovery to on-chain settlement
Last modified on March 23, 2026