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Browse 47.3k+ stars across 1624 open-source projects building the future of AI monetization, x402, and agentic commerce.

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What is x402 The HTTP 402 payment protocol, explained. HTTP 402 "Payment Required" — the status code behind x402. Ecosystem Map The whole agentic-payments landscape at a glance. x402 on Solana Agent payments settled in USDC on Solana. Paid MCP Servers Monetize your MCP server with x402. Facilitators Services that settle x402 payments. Payment Gateway Turn any API into a pay-per-call service. SDKs & Libraries Add x402 in TypeScript, Python, Rust, Go. Tutorial Build a paid API in 5 steps. x402 + Next.js Add a paywall in middleware.ts. x402 in Python FastAPI server & client SDK. Sell an API Pay-per-call, no API keys. Use Cases What people build with x402. Testnet Test free on Base Sepolia. Examples Starter kits & demos to clone and run. x402 vs Stripe Agent payments vs the card rails. x402 vs AP2 Settlement layer vs intent layer. x402 vs L402 USDC vs Bitcoin Lightning HTTP 402. x402 Foundation Who governs the x402 standard. Agent Wallets Give an AI agent a wallet that pays. AP2 Google's Agent Payments Protocol. ACP OpenAI + Stripe Agentic Commerce Protocol. x402 Bazaar How agents discover paid services. Compare Protocols x402 vs Stripe vs L402 vs AP2. Monetization Charge agents per call, not humans. Guides & Blog Deep dives on the agent payments stack.

☆ Featured Projects

A payments protocol for the internet. Built on HTTP.

by google-agentic-commerce

The A2A x402 Extension brings cryptocurrency payments to the Agent-to-Agent (A2A) protocol, enabling agents to monetize their services through on-chain payments. This extension revives the spirit of HTTP 402 "Payment Required" for the decentralized agent ecosystem.

a2aa2a-protocol

Daydreams is a set of tools for building agents for commerce

8004agent-framework

The AI agent with a wallet — spends USDC autonomously to get real work done. Apache-2.0, TypeScript.

ai-agentai-marketing

x402 payments in Rust: verify, settle, and monitor payments over HTTP 402 flows

by microchipgnu

Open-source Infrastructure for MCP and x402

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