x402

An open standard for internet-native payments that empowers agentic payments at scale.

Cost

Free

Rating

★ Mixed Reviews

Time to value

Quick Setup (< 1 hour)

You can use x402 to integrate payments directly into your APIs using HTTP requests. It returns a 402 payment required status when clients access your endpoints without payment, prompting them to pay and retry. The system works with stablecoins and requires no account setup, API key management, or centralized approval processes. Clients can make payments instantly and access your services immediately after payment confirmation.

What x402 does

Add payment middleware to existing APIsConfigure payment amounts per endpointSet up stablecoin payment acceptanceHandle 402 payment required responsesProcess instant blockchain paymentsMonitor transaction volumes and revenueIntegrate with multiple blockchain networksBuild AI agent payment capabilitiesOne line of code integration for paymentsBuilt into HTTP protocol with 402 status codesNo account setup or KYC requirementsInstant payment processing with stablecoinsNo API key management neededZero protocol fees for transactionsWorks with AI agents automaticallyOpen standard not tied to specific networks