HOW A2A, AP2, AND X402 ENABLE AGENTIC COMMERCE

Summary from the TLDR Crypto newsletter

A2A, AP2, and x402 form the communication and transaction stack that lets AI agents autonomously interact, agree, and pay one another. A2A defines the base grammar for agent communication, AP2 extends it for auditability with cart mandates detailing price and terms, and x402 (by Coinbase) executes verified onchain payments. In a working example, Bankless's agent hired an AI debate judge, sending a request via A2A, receiving a price quote via AP2, attesting and paying through x402, and receiving the debate output stored on EigenDA. Together, these protocols define how agents talk, agree, and pay, forming the foundation for autonomous agentic commerce.