x402.study
The definitive index for the Agent Economy.
69 Resources Indexed
🎯 Quick Start
5-Minute Quickstart (Sellers)
Accept your first payment.
Buyer/Client Setup
Make automated payments.
One-Line Integration
Add payment middleware in a single line of code.
Base Sepolia Testnet Setup
Get test USDC and start testing.
Production Deployment Checklist
Go live on Base mainnet.
📚 Official Resources
x402 Protocol Specification
Official open-source protocol implementation by Coinbase.
x402 Foundation
Protocol foundation website with overview and documentation.
x402 Whitepaper
Technical deep dive into protocol architecture.
Coinbase Developer Platform Docs
Complete implementation guide and API reference.
Protocol Specifications
Detailed technical specifications.
EVM Implementation
Ethereum Virtual Machine specifics.
🤖 AI Agent Integration
🔥 Ampersend LangChain Toolkit
Official LangChain integration. Implements 'Treasurer' pattern to separate payment logic.
Google A2A x402 Extension
Agent commerce protocol by Google.
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.
Spending Policy Engine
Spending Policy Engine for Agents (Innovation).
🏭 Production Implementations
AIsa Network
Leading payment processor with 10.5M+ cumulative transactions.
Bitget
Major exchange integrating x402 for seamless payment flows.
Coinbase Developer Platform
Official CDP implementation processing massive volume.
Cloudflare Workers
Edge computing platform with x402 integration across 300+ data centers.
🏗️ Facilitators & Infra
🔥 0x402.ai
The Premier Cloud Infrastructure. Deploy a Facilitator in seconds (FaaS).
Cloudflare x402
Edge computing facilitator on Base/Ethereum with deferred settlement.
Pieverse (BNB Chain)
BNB Chain facilitator with instant settlement.
x402-rs Facilitator
Production-grade self-hosted Rust facilitator.
💡 Example Applications
🔥 Crossmint Worldstore Agent
Shopping agent. Buy physical goods (Amazon) with USDC via gasless signatures.
Anchor Browser
Cloud browser automation API that charges per-session using x402. No subscriptions.
Weather API Service
Simple paid API endpoint.
Video Paywall
Premium content access tutorial.
Farcaster Mini App
Social app integration.
Browser Wallet Template
React + Hono + Session management.
🛠️ SDKs & Client Libraries
Primer x402 SDK
Python/TS SDK specialized for EIP-3009 gasless payment flows.
x402-typescript (Official)
Complete TypeScript implementation.
x402 (Python Official)
Python SDK on PyPI.
x402-rs
Production-grade Rust implementation.
x402-got
Got HTTP client integration.
viem
TypeScript library used for signing payments.
ethers.js
Alternative Ethereum library.
alloy
High-performance Ethereum library for Rust.
⚙️ Protocol Implementations
🔧 Server Frameworks
🎨 Use Cases & Patterns
Stableburn
Autonomous agent that monetizes endpoints and burns revenue tokens.
Dynamic Pricing Strategy
SIWE authentication with conditional pricing.
Cred Protocol
Decentralized credit scoring.
Apexti Toolbelt
1,500+ Web3 APIs via x402 MCP servers.
Zyte.com
Web scraping with x402 payments.
🎥 Videos & Talks
📝 Articles & Blog Posts
🔒 Security & Audits
Coinbase x402 Security Audit
Official security audit of smart contracts.
Circle USDC Audits
Comprehensive audits of USDC.
x402 Security Checklist
Production deployment security requirements.
Coinbase Bug Bounty
Rewards up to $50,000 for vulnerabilities.