x402.study
The definitive index for the Agent Economy. Discover protocols, SDKs, and tools to enable autonomous payments.
Official & Standards
x402 Protocol Specification
The bible of x402. Official open-source protocol implementation by Coinbase.
x402 Foundation
Official foundation website handling governance and standards.
Coinbase Developer Platform
Enterprise-grade documentation and managed facilitators.
EIP-3009 TransferWithAuthorization
The gasless token transfer standard powering the protocol.
Agent Economy (AI)
Ampersend LangChain Toolkit
🔥 Official LangChain integration. Implements 'Treasurer' pattern to separate payment logic from agent reasoning.
Google A2A Extension
Google's official extension for Agent-to-Agent commerce.
Anthropic MCP Server
Enable Claude Desktop to spend crypto autonomously via Model Context Protocol.
Phidata Agents
Multi-modal agents framework with native x402 support.
NEAR AI
Cross-chain agent settlements and intent execution.
Infrastructure & SaaS
0x402.ai
☁️ The Premier Cloud Infrastructure. Deploy a Facilitator in seconds (FaaS).
ChaosChain Facilitator
Decentralized facilitator with 'Triple-Verified' stack (x402 + ERC-8004 + AP2).
Cloudflare x402
Edge-computed payment verification running on Cloudflare Workers.
Pieverse (BNB Chain)
Official BNB Chain facilitator with instant settlement.
Apps & Commerce
Crossmint Worldstore Agent
🛍️ Shopping agent. Buy physical goods (Amazon) with USDC via gasless signatures.
Anchor Browser
Cloud browser automation API that charges per-session. No subscriptions needed.
AIsa Network
Leading payment processor with 10M+ transactions.
Bitget Integration
Major exchange integrating x402 for seamless payment flows.
SDKs & Dev Tools
Primer x402 SDK
🐍 Specialized Python/TS SDK for simplified EIP-3009 gasless flows.
Pinata 402 Server
Reference Node.js implementation for 'Pay-to-Pin' IPFS services.
x402-typescript
Official TypeScript SDK.
x402-rs
High-performance Rust implementation.
Foundry
Smart contract development toolkit used for x402 contracts.