UnifiedCheckoutProtocol (UCP) allows AI agents from any vendor to discover and interact with stores by fetching a single URL, supporting various payment methods including Google Pay, Shop Pay, and Stripe without additional fees beyond standard transaction costs. In contrast, Amazon Catalog Protocol (ACP) restricts discovery to OpenAI's ecosystem like ChatGPT, requiring merchants to submit product data for review before becoming discoverable, and mandates the use of Stripe with a 3% fee on transactions. UCP offers broader reach but requires more setup, while ACP provides direct access to a large user base at the cost of flexibility in payment options and higher fees.
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