x402 Protocol
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HTTP payment protocol enabling AI agents to pay for services via USDC micropayments on Base.
URL: x402.org Status: Active X: @x402_Layer
What It Does
x402 repurposes the HTTP 402 "Payment Required" status code for on-chain payments. When an AI agent requests a paid service, it receives a payment request, sends USDC on Base, and access is automatically granted.
Stripe integrated x402 on February 11, 2026, enabling developers to charge agents using USDC on Base. CoinGecko launched x402-powered API endpoints at $0.01 per request.
Key Features
- Open payment standard by Coinbase
- Sub-second settlement on Base
- Micropayments for APIs, data, and compute
- No accounts, subscriptions, or API keys needed
- Stripe integration (Feb 2026)
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