·Dora Noda·12 min
MCP + A2A + x402: The Three-Layer Agent Commerce Stack Web3 Developers Can't Ignore
April 2026 locked in the three-layer stack every agent transaction now uses: MCP for tools, A2A for coordination, x402 for payments. Here is what Web3 developers need to ship.
AI agents
x402 Protocol
AI commerce
infrastructure
+1·Dora Noda·33 min
x402 Protocol: The Race to Build Payment Infrastructure for the Machine Economy
The x402 Protocol, initiated by Coinbase, aims to revolutionize internet payments by enabling AI agents to transact autonomously at machine speed. Despite its potential to underpin a $3-5 trillion AI economy, the protocol faces significant architectural challenges and competitive threats.
x402 Protocol
AI economy
payment-infrastructure
Web3
+2