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Standards & Interoperability

Making x402 programmable: extending the HTTP-payments flow with Smart Accounts & Contracts

x402 is doing something very useful and at the same time simple : resurrecting HTTP 402 Payment Required as a standard way for machines to ask for payment and then retry the same HTTP request with proof of payment. The result is an internet-native payment handshake that works for APIs, AI agents, and micro-services—without accounts, API keys, or subscription checkout flows.

Building Agentic Payments with Nevermined, x402, A2A, and AP2

AI agents today can research, negotiate, and collaborate, but when it comes to handling payments, everything suddenly becomes messy.