3/ HTTP 402 was defined over 30 years ago as “Payment Required,” but never widely used.Now, Ethereum gives it purpose.With x402 and EIP 3009, any server can quote a price in USDC. If the agent pays, the request goes through. If not, it’s denied. ...

Agent Capabilities - Agents are becoming more prevalent in daily use, including through MCP and pre-defined tool calling [1] - Agents have historically lacked the ability to manage finances, hindering their ability to pay for resources like API calls, storage, inference, or MCP access without human intervention [2] - The introduction of HTTP 402 is changing this limitation [2]