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Agentic Commerce Protocol (ACP) is an open standard by OpenAI that gives AI agents a shared way to discover merchants, browse catalogs, manage carts, and complete purchases. Prism handles the payment side: it returns the handler declaration, generates x402 payment requirements for each order, and settles the signed payment on-chain.

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What Prism Does

  1. Handler. Prism returns the xyz.fd.prism_payment handler declaration. Merchants add the x402 payment requirements as its config and include the result in their checkout session responses. Chains, tokens, and settlement addresses are configured in the Prism Console.
  2. Payment requirements. At checkout, Prism returns x402 payment requirements with the correct token amounts and contract addresses already resolved.
  3. Settlement. The merchant forwards the agent’s signed credential to Prism. Prism verifies it, executes the on-chain transfer, and returns the transaction hash.

For Merchants

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

For Agents

Discover ACP merchants, sign x402 payments, and complete checkout

End-to-End Flow

Follow one complete purchase from discovery to on-chain settlement
Last modified on April 29, 2026