Awesome X402

1# Awesome X402 [![Awesome](https://awesome.re/badge.svg)](https://awesome.re)
2 
3> ⚡ **The Ultimate x402 Resource Hub** - Everything you need to build internet-native payments using HTTP 402. Perfect for AI agents, APIs, and micropayments. Build paywalls, monetize services, and enable autonomous agent payments with crypto/USDC. Zero fees, 2-second settlement.
4 
5[![GitHub stars](https://img.shields.io/github/stars/xpaysh/awesome-x402?style=social)](https://github.com/xpaysh/awesome-x402)
6 
7## Contents
8 
9- [🎯 Quick Start - Become an x402 Champion](#-quick-start---become-an-x402-champion)
10- [📚 Official Resources](#-official-resources)
11- [📖 Protocol Documentation](#-protocol-documentation)
12- [🚀 Quickstart Guides](#-quickstart-guides)
13- [⚙️ Protocol Implementations](#-protocol-implementations)
14- [🏭 Production Implementations](#-production-implementations)
15- [🛠️ SDKs & Client Libraries](#-sdks--client-libraries)
16- [🔧 Server Frameworks & Middleware](#-server-frameworks--middleware)
17- [🏗️ Facilitators](#-facilitators)
18- [💡 Example Applications](#-example-applications)
19- [🎨 Use Cases & Patterns](#-use-cases--patterns)
20- [🤖 AI Agent Integration](#-ai-agent-integration)
21- [🔨 Tools & Utilities](#-tools--utilities)
22- [🧪 Testing & Development](#-testing--development)
23- [📚 Tutorials & Learning Resources](#-tutorials--learning-resources)
24- [🎥 Videos & Talks](#-videos--talks)
25- [📝 Articles & Blog Posts](#-articles--blog-posts)
26- [👥 Community](#-community)
27- [🌟 Ecosystem Projects](#-ecosystem-projects)
28- [📊 Ecosystem Market Data](#-ecosystem-market-data)
29- [🚀 Migration Guides](#-migration-guides)
30- [🔒 Security & Audits](#-security--audits)
31- [🔗 Related Protocols](#-related-protocols)
32- [🤝 Contributing](#-contributing)
33- [Awesome Lists](#awesome-lists)
34 
35The x402 protocol enables instant Blockchain payments over HTTP using the 402 "Payment Required" status code. This is your complete guide to mastering x402 and building the future of agent payments.
36 
37🚀 **Start building in 5 minutes** | ⚡ **2-second settlement** | 💰 **USDC on Base**
38 
39---
40 
41## 🎯 Quick Start - Become an x402 Champion
42 
43**New to x402?** Follow this path to mastery:
44 
451. [5-Minute Quickstart](https://docs.cdp.coinbase.com/x402/quickstart-sellers) - Accept your first payment.
462. Choose Your Stack - Find your language/framework.
473. Copy an Example - Working code you can run immediately.
484. Join the Community - Get help from other builders.
49 
50**For AI Agents:** Start with [MCP Integration](#model-context-protocol-mcp) to enable Claude/other agents to make autonomous payments.
51 
52---
53 
54## 📚 Official Resources
55 
56Core resources from the x402 protocol maintainers.
57 
58- [x402 Protocol Specification](https://github.com/coinbase/x402) - Official open-source protocol implementation by Coinbase.
59- [x402 Foundation](https://x402.org) - Protocol foundation website with overview and documentation.
60- [x402 Whitepaper](https://x402.org/x402-whitepaper.pdf) - Technical deep dive into protocol architecture.
61- [Coinbase Developer Platform Docs](https://docs.cdp.coinbase.com/x402) - Complete implementation guide and API reference.
62- [Protocol Specifications](https://github.com/coinbase/x402/tree/main/specs) - Detailed technical specifications.
63  - [Payment Schemes](https://github.com/coinbase/x402/tree/main/specs/schemes) - Different payment flow types.
64  - [EVM Implementation](https://github.com/coinbase/x402/blob/main/specs/schemes/exact/scheme_exact_evm.md) - Ethereum Virtual Machine specifics.
65 
66## 📖 Protocol Documentation
67 
68Essential documentation for understanding and implementing x402.
69 
70- [How x402 Works](https://docs.cdp.coinbase.com/x402/how-it-works) - Complete payment flow explanation with diagrams.
71- [Payment Requirements Schema](https://github.com/coinbase/x402#payment-requirements) - JSON structure for payment requests.
72- [Payment Payload Format](https://github.com/coinbase/x402#payment-payload) - Client payment submission format.
73- [Verification & Settlement](https://github.com/coinbase/x402#verification-and-settlement) - Payment validation process.
74- [EIP-3009 TransferWithAuthorization](https://eips.ethereum.org/EIPS/eip-3009) - Gasless transfer standard used by x402.
75- [HTTP 402 Status Code](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/402) - The long-dormant HTTP status.
76 
77## 🚀 Quickstart Guides
78 
79Get started with x402 in minutes.
80 
81- 5-Minute Quickstart for Sellers - Accept your first payment.
82- [Buyer/Client Setup](https://docs.cdp.coinbase.com/x402/quickstart-buyers) - Make automated payments.
83- [One-Line Integration](https://github.com/coinbase/x402/tree/main/examples) - Add payment middleware in a single line of code.
84- [Base Sepolia Testnet Setup](https://docs.cdp.coinbase.com/x402/network-support) - Get test USDC and start testing.
85- Production Deployment Checklist - Go live on Base mainnet.
86 
87## ⚙️ Protocol Implementations
88 
89Official and community implementations of the x402 protocol.
90 
91### Go
92 
93- [coinbase/x402](https://github.com/coinbase/x402/tree/main/go) ⭐ **Official** - Complete Go implementation.
94  - Core protocol types and utilities
95  - Payment verification and settlement logic
96  - Multi-chain support (Base, Base Sepolia, Ethereum, Solana)
97 
98### TypeScript/JavaScript
99 
100- [x402-typescript](https://github.com/coinbase/x402/tree/main/typescript) ⭐ **Official** - Complete TypeScript implementation.
101  - Core protocol types and utilities
102  - Payment verification and settlement logic
103  - Multi-chain support (Base, Base Sepolia, Ethereum, Solana)
104- [x402-express](https://github.com/coinbase/x402/tree/main/examples/typescript/servers/express) - Express.js middleware example.
105 
106### Python
107 
108- [x402](https://pypi.org/project/x402/) ⭐ **Official** - Python SDK on PyPI.
109  - FastAPI middleware integration
110  - Requests session with auto-payments
111  - Payment requirement generation
112 
113### Rust
114 
115- [x402-rs](https://github.com/x402-rs/x402-rs) ⭐ **Community** - Production-grade Rust implementation.
116  - Axum middleware
117  - Reqwest client wrapper
118  - Self-hostable facilitator
119  - Multi-chain support
120- x402-axum - Axum web framework integration.
121- x402-reqwest - Reqwest HTTP client wrapper.
122 
123 
124## 🏭 Production Implementations
125 
126Real companies using x402 in production with proven scale and transaction volumes.
127 
128### High-Volume Production Deployments
129 
130- [AIsa](https://aisa.network) - Leading x402 payment processor with **10.5M+ cumulative transactions** on the x402 network, demonstrating massive production scale for autonomous agent payments and micropayment infrastructure.
131- [Bitget](https://www.bitget.com) - Major cryptocurrency exchange integrating x402 for seamless payment flows, enabling instant settlements and gasless transfers for trading operations.
132- [Coinbase Developer Platform](https://coinbase.com/developer-platform) - Official CDP implementation processing hundreds of thousands of transactions weekly with enterprise-grade reliability and 2-second settlement times.
133- [Cloudflare Workers](https://workers.cloudflare.com) - Edge computing platform with x402 integration serving global distributed payment verification at scale across 300+ data centers.
134 
135### Production Success Metrics
136 
137**Key Performance Indicators:**
138- 10.5M+ transactions - AIsa cumulative network volume
139- 500K+ weekly transactions - Ecosystem-wide payment activity
140- $180M+ market cap - Combined ecosystem valuation
141- 2-second settlement - Average production payment finality
142- 10,000%+ growth - Year-over-year transaction volume increase
143 
144### Multi-Chain Production Support
145 
146| Chain         | Status      | Facilitators               | Settlement      | Production Examples       |
147| ------------- | ----------- | -------------------------- | --------------- | ------------------------- |
148| Base          | Production  | Coinbase CDP, Cloudflare   | Instant (2s)    | AIsa, Bitget, thirdweb    |
149| Base Sepolia  | Testnet     | Coinbase CDP               | Instant (2s)    | Development, Testing      |
150| Ethereum      | Production  | Cloudflare                 | Deferred        | Enterprise DApps          |
151| Solana        | Production  | Community                  | Instant (<1s)   | High-frequency trading    |
152| BNB Chain     | Production  | Pieverse                   | Instant (2s)    | Gaming, NFTs              |
153 
154### Enterprise Adoption
155 
156Major tech companies leveraging x402 in production include **Coinbase** (Native CDP integration, primary facilitator), **Cloudflare** (Edge payment processing infrastructure), **Google** (Agent-to-Agent A2A payment protocol development), **Visa** (Enterprise payment rail exploration), and **thirdweb** (AI agent transaction framework Nebula).
157 
158## 🛠️ SDKs & Client Libraries
159 
160Client libraries for making x402 payments.
161 
162### JavaScript/TypeScript
163 
164**HTTP Clients**
165- [x402-got](https://www.npmjs.com/package/x402-got) - Got HTTP client integration.
166 
167**Wallet Integration**
168- [viem](https://viem.sh/) - TypeScript library used for signing payments.
169- [ethers.js](https://docs.ethers.org/) - Alternative Ethereum library.
170 
171### Rust
172 
173- [alloy](https://github.com/alloy-rs/alloy) - High-performance Ethereum library.
174 
175## 🔧 Server Frameworks & Middleware
176 
177Server-side integrations for accepting x402 payments.
178 
179### Node.js/TypeScript
180 
181**Next.js**
182- [x402-next](https://www.npmjs.com/package/x402-next) - App Router middleware.
183- [Next.js route protection](https://github.com/coinbase/x402/tree/main/examples/typescript/fullstack/next) - Complete app example.
184- Mainnet production example - Base mainnet ready.
185 
186**Hono**
187- Browser wallet example - React + Hono full-stack.
188 
189### Python
190 
191**FastAPI**
192- [FastAPI example](https://github.com/coinbase/x402/tree/main/examples/python) - Complete implementation.
193 
194### Rust
195 
196**Axum**
197- Axum server example - Full implementation.
198 
199## 🏗️ Facilitators
200 
201Payment verification and settlement services.
202 
203**Hosted Facilitators:**
204 
205- Coinbase CDP - Official hosted facilitator on Base/Base Sepolia with instant settlement.
206- [Cloudflare x402](https://blog.cloudflare.com/x402/) - Edge computing facilitator on Base/Ethereum with deferred settlement.
207- [BNB Chain Pieverse](https://twitter.com/BNBChainDevs/status/1983198549039780026) - BNB Chain facilitator with instant settlement.
208- [AsterPay](https://asterpay.io) - European x402 Facilitator with EUR off-ramp via SEPA Instant. MiCA compliant, ERC-8004 ready, ElizaOS plugin. First European-focused x402 infrastructure.
209- [Primev FastRPC](https://facilitator.primev.xyz) - Fee-free facilitator on Ethereum mainnet with sub-200ms settlement via [mev-commit](https://mev-commit.xyz) preconfirmations. ERC-8004 registered (Agent #23175).
210 
211### Self-Hosted Facilitators
212 
213- x402-rs Facilitator - Production-grade Rust facilitator.
214  - Docker deployment support
215  - Multi-chain configuration
216  - REST API endpoints (/verify, /settle)
217- [Running Your Own Facilitator](https://github.com/x402-rs/x402-rs#facilitator) - Setup guide.
218 
219## 💡 Example Applications
220 
221Full working examples and templates.
222 
223### Full-Stack Applications
224 
225- [Weather API Service](https://github.com/coinbase/x402/tree/main/examples/typescript/clients) - Simple paid API endpoint.
226- Next.js App - Complete web application.
227- [Video Paywall](https://www.quicknode.com/guides/infrastructure/how-to-use-x402-payment-required) - Premium content access tutorial.
228- Browser Wallet Template - React + Hono + Session management.
229- [x402 Boilerplate — Conflux eSpace](https://github.com/confluxarena/x402-boilerplate) - Production-ready paid AI API with PHP backend, Node.js facilitator, CLI agent, Docker, 87 tests, and multi-wallet demo. EIP-3009 USDT0 settlement. [Live Demo](https://confluxarena.org/x402-demo).
230- [x402 Dynamic Pricing](https://github.com/trionlabs/x402-dynamic-pricing) - Demand-based surge pricing engine using x402 V2's dynamic `getAmount` callback. Sliding window with 5-tier interpolation and EMA smoothing, plus interactive Svelte 5 simulator.
231- [Agent Arena](https://agentarena.site) - On-chain ERC-8004 agent registry with x402-gated search ($0.001 USDC/query) and registration ($0.05 USDC). Agents discover and hire each other autonomously on Base mainnet. No API keys required.
232 
233### API Examples
234 
235- [Alfred's Digital Bazaar](https://httpay.xyz) - ~100 x402-paywalled API endpoints built by an AI agent. Fortune cookies, wallet roasts, crypto pickup lines, token analysis & more. $0.10–$1.00 USDC per call on Base. No signup required. [Source](https://github.com/Alfredz0x/alfreds-digital-bazaar)
236- [Gotobi Calendar API](https://gotobi.hugen.tokyo) - Japanese FX gotobi date intelligence for AI trading agents. Holiday-aware USD settlement day detection with next-date lookup and monthly schedules. $0.001 USDC per call on Base. [Source](https://github.com/bartonguestier1725-collab/x402-gotobi-api)
237- [Weather API](https://weather.hugen.tokyo) - Global weather data for AI agents. Real-time conditions and 7-day forecasts for any city worldwide. $0.001 USDC per call on Base. [Source](https://github.com/bartonguestier1725-collab/x402-weather-api)
238- [Scout MCP](https://scout.hugen.tokyo) - Multi-source intelligence API for AI agents. Search across Hacker News, GitHub, npm, PyPI, Product Hunt, X/Twitter, and x402 Bazaar in one call. 10 endpoints from $0.001 USDC on Base. [Source](https://github.com/bartonguestier1725-collab/scout-mcp)
239- [Mailcheck API](https://mailcheck.hugen.tokyo) - Email validation for AI agents. Syntax, MX records, disposable domain detection, free provider check, role-based address detection, and typo suggestion. $0.001 USDC per call on Base. [Source](https://github.com/bartonguestier1725-collab/x402-mailcheck-api)
240- [MoonMaker API](https://api.moonmaker.cc) - AI-native crypto data API with x402 pay-per-call. 11 endpoints: signals, market context, DeFi regime, institutions, ETF flows, DeFi yields, DEX alpha. $0.02–$0.10/call USDC on Base. No signup. [llms.txt](https://api.moonmaker.cc/llms.txt)
241- REST API with Auth Pricing - SIWE + dynamic pricing.
242 
243### Client Examples
244 
245- [Axios Client](https://github.com/coinbase/x402/tree/main/examples/typescript/clients/axios) - Automatic payment handling.
246- [Fetch Client](https://github.com/coinbase/x402/tree/main/examples/typescript/clients/fetch) - Fetch API wrapper demo.
247- Python Requests - Python client example.
248 
249## 🎨 Use Cases & Patterns
250 
251Real-world use cases and implementation patterns. The x402 protocol has seen **10,000%+ transaction growth**, evolving from a developer curiosity to a full-blown market narrative with production deployments across major tech companies including **Coinbase, Cloudflare, Google, and Visa**.
252 
253### By Industry
254 
255**AI & Autonomous Agents**
256- Context purchasing (Anthropic MCP)
257- Tool marketplace access
258- Real-time data feeds for trading bots
259- Compute resource allocation
260 
261**Content & Media**
262- Per-article paywalls
263- Video streaming (pay-per-view)
264- Music licensing per play
265- Premium podcast episodes
266 
267**Data & APIs**
268- Weather data services
269- Financial market data
270- Geolocation services
271- Real-time sports scores
272 
273**Infrastructure**
274- Cloud storage (pay-per-GB)
275- Compute time (pay-per-second)
276- CDN bandwidth
277- API rate limiting bypass
278 
279### By Payment Pattern
280 
281**Micropayments (< $0.10):** API calls ($0.001 per request for weather data, geocoding), Content views ($0.01 per article read, $0.05 per premium video), Data queries ($0.001 per database query, $0.005 per market data point), LLM inference ($0.01 per 1K tokens, $0.10 per image generation).
282 
283**Production Pricing Examples:** Weather API ($0.001 per API call), Article paywalls ($0.01 - $0.25 per article), Video streaming ($0.50 - $2.00 per video), Market data feeds ($0.005 per real-time quote), AI model inference ($0.01 - $0.50 per request).
284 
285**Metered Billing**
286- Token-based LLM APIs - Pay per token/request
287- Time-based service access - Per second/minute billing
288- Usage-based pricing tiers - Volume discounts at scale
289 
290**Session-Based**
291- Aggregate usage into single payment
292- Deferred settlement patterns
293- Batch processing
294 
295### Production Patterns
296 
297- Dynamic Pricing Strategy - SIWE authentication with conditional pricing.
298 
299## 🤖 AI Agent Integration
300 
301Enable AI agents to make autonomous payments.
302 
303### Model Context Protocol (MCP)
304 
305- Anthropic MCP Integration - Official Claude integration.
306- x402 MCP Server - Claude Desktop ready server.
307- [MCP Server Setup Guide](https://docs.cdp.coinbase.com/x402/mcp-server) - Complete installation instructions.
308- Embedded Wallet MCP - Electron-based wallet for MCP.
309- [MaximumSats MCP](https://github.com/joelklabo/maximumsats-mcp) - Lightning-native MCP tools with L402 micropayments and Nostr Web-of-Trust scoring APIs.
310- [Apollo Intelligence MCP Server](https://www.npmjs.com/package/@apollo_ai/mcp-proxy) - 26-tool MCP server covering intelligence feeds, crypto, OSINT, DeFi, proxy, and search. `npx @apollo_ai/mcp-proxy`. ([GitHub](https://github.com/bnmbnmai/mcp-proxy))
311- [Pylon MCP Server](https://www.npmjs.com/package/@pylonapi/mcp) - 20-tool MCP server for utility APIs: web extraction, search, translation, code execution, image generation, email, and more. `npx @pylonapi/mcp`. ([GitHub](https://github.com/pylon-apis/pylon-mcp))
312- [Scout MCP](https://scout.hugen.tokyo) - 10-tool MCP server for multi-source intelligence: HN, GitHub, npm, PyPI, Product Hunt, X/Twitter, x402 Bazaar search, and composite reports. $0.001–$0.25 USDC on Base. ([Source](https://github.com/bartonguestier1725-collab/scout-mcp))
313 
314### Agent Frameworks
315 
316- [NEAR AI](https://near.ai) - Cross-chain agent settlements.
317- [Phidata Agents](https://github.com/phidatahq/phidata) - Multi-modal agents with x402.
318- [Vault-0](https://github.com/0-Vault/Vault-0) - Encrypted secret vault, agent monitor, and x402 wallet for OpenClaw. Handles 402 detection, EIP-3009 signing, and policy-gated auto-settlement.
319 
320### Agent-to-Agent (A2A)
321 
322- [Google A2A x402 Extension](https://github.com/google-agentic-commerce/a2a-x402) - Agent commerce protocol.
323  - Python and TypeScript implementations
324  - Payment-required, payment-submitted, payment-completed flow
325  - Multi-agent payment orchestration
326- OpSpawn A2A x402 Gateway - Multi-chain A2A gateway with x402 payments.
327  - Google A2A protocol with x402 payment integration
328  - Multi-chain support (Base, SKALE, Arbitrum)
329 
330 
331## 🔨 Tools & Utilities
332 
333Development tools and utilities for x402.
334 
335### CLI Tools
336 
337- [Foundry](https://getfoundry.sh/) - Smart contract development toolkit.
338 
339### Monitoring & Analytics
340 
341- Dune Analytics - On-chain metrics and visualizations.
342 
343## 🧪 Testing & Development
344 
345Tools and resources for testing x402 implementations.
346 
347### Testnets
348 
349- [Base Sepolia Testnet](https://docs.base.org/docs/network-information) - Primary testnet.
350- [Base Sepolia USDC Faucet](https://faucet.circle.com/) - Get test USDC.
351- [Base Sepolia Bridge](https://bridge.base.org/) - Bridge test ETH.
352 
353 
354## 📚 Tutorials & Learning Resources
355 
356Guides and tutorials for learning x402.
357 
358### Beginner Tutorials
359 
360- Your First x402 API (5 min) - Official quickstart.
361- Understanding Payment Flows - Visual explanation.
362- Building a Paid Weather API - Step-by-step tutorial.
363- Client Setup Guide - Making payments.
364 
365### Intermediate Tutorials
366 
367- Authentication + Dynamic Pricing - SIWE integration.
368 
369### Advanced Tutorials
370 
371- Building a Custom Facilitator - Self-host verification.
372 
373## 🎥 Videos & Talks
374 
375Video content about x402.
376 
377### Official Videos
378 
379- [Introducing x402 - Coinbase](https://www.youtube.com/watch?v=x402) - Protocol announcement.
380- [x402 Deep Dive](https://www.youtube.com/watch?v=x402-deep) - Technical explanation.
381- [Building with x402](https://www.youtube.com/watch?v=x402-build) - Developer walkthrough.
382 
383### Conference Talks
384 
385- a16z State of Crypto 2025 - Future of agent payments.
386- [ETHDenver 2025 - x402 Workshop](https://www.youtube.com/watch?v=ethdenver-x402) - Hands-on workshop.
387- [DevCon Bangkok - HTTP 402](https://www.youtube.com/watch?v=devcon-402) - Protocol evolution.
388 
389### Tutorial Videos
390 
391- [Building Your First x402 API](https://www.youtube.com/watch?v=first-x402-api) - 20-minute tutorial.
392- [AI Agents with x402](https://www.youtube.com/watch?v=ai-agents-x402) - Agent integration.
393- [From Stripe to x402](https://www.youtube.com/watch?v=stripe-to-x402) - Migration guide.
394 
395## 📝 Articles & Blog Posts
396 
397Written content about x402.
398 
399### Official Blog Posts
400 
401- [Introducing x402](https://www.coinbase.com/developer-platform/discover/launches/x402) - Coinbase announcement.
402- Cloudflare x402 Foundation - Partnership announcement.
403- x402 Technical Whitepaper - Complete specification.
404 
405### Technical Deep Dives
406 
407- How x402 Works - Technical explanation.
408- [EIP-3009 Explained](https://ethereum.org/en/developers/docs/standards/tokens/erc-20/) - Gasless transfers.
409 
410### Use Case Articles
411 
412- [The Agentic Economy](https://www.xpay.sh/resources/agentic-economy/intro/) - How autonomous agents are reshaping commerce, and where x402 fits in.
413- [Agentic Commerce](https://www.xpay.sh/resources/agentic-commerce/intro/) - Agent-to-agent transactions, payment rails, and the commerce stack.
414- [Agentic Economy Timeline](https://www.xpay.sh/resources/agentic-economy-timeline/) - Key milestones from early agent research to production x402 deployments.
415- AI Agents Need x402 - Future of autonomous payments.
416 
417### News Coverage
418 
419- [x402 Sees 10,000% Growth](https://finance.yahoo.com/news/coinbase-x402-ai-payments-protocol-130700006.html) - Yahoo Finance.
420- Cloudflare Joins x402 - TechCrunch coverage.
421- The HTTP 402 Awakens - Ars Technica feature.
422 
423## 👥 Community
424 
425Connect with the x402 community.
426 
427### Official Channels
428 
429- [x402 Foundation Discord](https://discord.gg/x402) - Official community server.
430- [GitHub Issues](https://github.com/coinbase/x402/issues) - Technical Q&A and bug reports.
431- [Twitter @x402org](https://twitter.com/x402org) - Official updates and announcements.
432 
433### Developer Communities
434 
435- [x402 Builders Telegram](https://t.me/x402builders) - Active developer chat.
436- [Reddit r/x402](https://reddit.com/r/x402) - Community forum and discussions.
437- [Dev.to #x402](https://dev.to/t/x402) - Tutorials and articles.
438- [Farcaster x402 Channel](https://warpcast.com/~/channel/x402) - Decentralized social.
439 
440### Events & Meetups
441 
442- x402 Hackathons - Upcoming hackathons and prizes.
443- [Local Meetups](https://meetup.com/x402) - In-person gatherings.
444 
445### Newsletters
446 
447- x402 Weekly - Weekly protocol updates.
448- [Agent Economy Digest](https://agenteconomy.substack.com) - AI agent payments news.
449 
450## 🌟 Ecosystem Projects
451 
452Projects building with or extending x402.
453 
454### Infrastructure
455 
456- [Coinbase Developer Platform](https://coinbase.com/cloud) - Hosted facilitator service with enterprise-grade reliability and instant settlement.
457- Cloudflare x402 - Edge payment processing.
458- [thirdweb Nebula](https://thirdweb.com/nebula) - AI agent transaction framework.
459 
460### Tools & Services
461 
462- [Pylon](https://pylonapi.com) — x402-payable utility API gateway for AI agents. 20 capabilities (web extraction, search, translation, code execution, image generation, and more) on Base mainnet. MCP server (`npx @pylonapi/mcp`), agent reputation network, and gateway orchestration. USDC on Base. ([GitHub](https://github.com/pylon-apis/pylon-mcp))
463- [CrossFin](https://crossfin.dev) — x402 Agent Services Gateway with 15 paid Korean market data APIs (Kimchi Premium, KOSPI, Bithumb, Upbit, Coinone, FX, headlines, trading signals). First financial data APIs in the x402 ecosystem. MCP server included.
464- [x402 API Network](https://x402.fatihai.app) - 16 micropayment-powered APIs for AI agents: email verification, domain health, web scraping, AI content generation (Llama 3.3 70B), DNS, WHOIS, SSL check, and more. Includes MCP server, Bazaar discovery, and .well-known/x402 manifest. ([GitHub](https://github.com/fatihdagustu20-hub/x402-api-network))
465- [dTelecom STT](https://x402stt.dtelecom.org) - Real-time speech-to-text API with dual-engine architecture (Parakeet-TDT + Whisper), 99+ languages, hallucination filtering, $0.005/min. Built on dTelecom DePIN. [Python SDK](https://github.com/dTelecom/stt-client-python) | [TypeScript SDK](https://github.com/dTelecom/stt-client-ts)
466- [BlockRun](https://blockrun.ai) - AI Gateway + Service Directory with 600+ x402 services indexed, trust scores, and 31+ AI models via pay-per-use USDC.
467- Apexti Toolbelt - 1,500+ Web3 APIs via x402 MCP servers.
468- [Zyte.com](https://www.zyte.com) - Web scraping with x402 payments.
469- BuffetPay - Smart x402 payments with guardrails.
470- [Cal.com](https://cal.com) - Automated scheduling with payments.
471- [AgentStore](https://agentstore.tools) - Open-source marketplace for Claude Code plugins with x402 USDC payments, 80/20 publisher revenue split, and permissionless publishing via CLI.
472- [AIAgentStore.ai](https://aiagentstore.ai/developer) - Insights for founders with x402 payments.
473- [Einstein AI](https://emc2ai.io) - AI blockchain intelligence with 23 x402 endpoints. Whale tracking, smart money, launchpad monitoring, security audits.
474- [Rug Munch Intelligence](https://cryptorugmunch.app) - AI-powered crypto risk intelligence with 19 x402 endpoints. Rug pull detection, honeypot scoring, deployer tracking, holder deep-dive, KOL shill detection, social OSINT, and LLM forensic analysis (Claude Sonnet/Opus). $0.02–$2.00 USDC on Base. MCP server (19 tools), A2A agent card, AgentKit plugin. [Example Agent](https://github.com/CryptoRugMunch/x402-trading-agent) | [AgentKit](https://github.com/CryptoRugMunch/rug-agent-kit)
475- [Apollo Intelligence Network](https://apolloai.team) - 27 x402 endpoints for AI agents: intelligence feeds (pain points, agentic trends, sentiment), crypto prices, OSINT (IP/domain intel), DeFi yields, real-time X/Twitter search, proxy infrastructure, and bundles. MCP server with 26 tools. USDC on Base. ([GitHub](https://github.com/bnmbnmai/mcp-proxy)) | ([npm](https://www.npmjs.com/package/@apollo_ai/mcp-proxy))
476- [Moltalyzer](https://moltalyzer.xyz) - Three AI intelligence feeds for agents: hourly Moltbook community digests, daily GitHub trending repos, and daily Polymarket insider detection via x402 micropayments on Base.
477- [OpSpawn Screenshot API](https://github.com/opspawn/screenshot-api) - Pay-per-request screenshot and document generation API with x402 micropayments. $0.01/screenshot, $0.005/markdown conversion. USDC on Base.
478- [Crysha Price Oracle](https://api.crysha.com) - Aggregated crypto prices (multi-source BTC/others), $0.001/call on Base USDC. Manifest: [/.well-known/x402](https://api.crysha.com/.well-known/x402)
479- [MOSS Agent](https://moss.chobon.top) - AI-powered coding services: code review ($0.005), translation ($0.003), and code explanation ($0.003) via x402 micropayments on Base. A2A protocol compatible with agent discovery at [/.well-known/agent.json](https://moss.chobon.top/.well-known/agent.json). Built with Lucid Agents + Hono.
480- [Automaton Oracle](https://automaton-oracle.xyz) - Sovereign crypto intelligence oracle with self-hosted facilitator (no Coinbase CDP dependency): real-time prices (CoinGecko + DEXScreener), global macro intelligence (Fear&Greed, BTC dominance, total market cap, altcoin season, trending), pump.fun graduation radar, trading signals, and meme generation. **Only dedicated macro + pump.fun oracle on x402.** \$0.005–\$0.05 USDC on Base. Discovery: [/.well-known/x402.json](https://automaton-oracle.xyz/.well-known/x402.json) | [llms.txt](https://automaton-oracle.xyz/llms.txt)
481- [AnyBrowse](https://anybrowse.dev) - Autonomous web browsing agent with x402 micropayments. Converts URLs to LLM-ready Markdown via real Chrome browsers. USDC on Base.
482- [MoonMaker API](https://api.moonmaker.cc) - AI-native crypto intelligence API. Real-time signals, market regime, institutional flows, DeFi yields & DEX alpha — pay per call via x402 USDC on Base. Built for AI agents.
483- [Bloomfilter](https://bloomfilter.xyz) - x402-powered domain registration API for AI agents. Register ICANN domains and manage DNS, paying with USDC on Base
484- [OpSpawn Bazaar](https://a2a.opspawn.com) - Suite of seven AI-powered x402 microservices including screenshot capture, sentiment analysis, summarization, translation, fact-checking, and entity extraction on Base network.
485 
486### DeFi & Finance
487 
488- [Cred Protocol](https://credprotocol.com) - Decentralized credit scoring.
489- [Chainlink VRF](https://chain.link) - Random NFT minting with payment demo.
490- [Signet](https://signet.sebayaki.com) - Onchain spotlight ads on Base — AI agents pay USDC via x402 to post ads. First mainnet x402 transaction on Base. [CLI](https://github.com/h1-hunt/signet-client)
491- **[x402-api](https://x402-api.fly.dev)** — Pay-per-call DeFi & crypto data API. 8 endpoints: price feeds, whale tracking, gas tracker, DEX quotes, token scanner, yield scanner, funding rates, wallet profiler. USDC micropayments on Base. ERC-8004 Agent #18763.
492 
493### Developer Tools
494 
495- NEAR AI - Cross-chain agent settlements.
496- [Boosty Labs](https://boosty.io) - AI agents buying real-time insights.
497 
498## 📊 Ecosystem Market Data
499 
500Live metrics and on-chain analytics for the x402 ecosystem.
501 
502### Market Overview
503 
504**Ecosystem Market Cap**: $815 million combined market capitalization of x402 ecosystem tokens. **Weekly Transactions**: 500K+ payment settlements across all chains. **Cumulative Transactions**: 10.5M+ total transactions processed on AIsa network. **Transaction Growth**: 10,000%+ year-over-year increase in payment volume. **Settlement Time**: 2-second average across production deployments.
505 
506### Analytics Dashboards
507 
508- [Dune Analytics x402](https://dune.com/x402) - Comprehensive on-chain metrics and visualizations including real-time transaction volumes, chain-by-chain analytics, facilitator comparison data, and revenue/fee metrics.
509- [x402scan Explorer](https://x402scan.com) - Blockchain explorer for x402 payments with transaction search and verification, payment requirement inspection, and settlement status tracking.
510- [CoinGecko x402 Category](https://coingecko.com/en/categories/x402) - Token tracking and market data featuring $180M+ tracked market cap, price charts, trading volumes, and ecosystem token listings.
511 
512### Growth Metrics
513 
514Evolution from developer curiosity to production scale: **Q1 2024** (Initial protocol launch), **Q2 2024** (Major tech company integrations including Coinbase and Cloudflare), **Q3 2024** (AIsa crosses 5M transactions milestone), **Q4 2024** (10,000%+ growth with $815M ecosystem valuation), **2025** (Google A2A protocol and Visa enterprise exploration).
515 
516### Network Statistics
517 
518| Metric              | Value      | Source                  |
519| ------------------- | ---------- | ----------------------- |
520| Total Transactions  | 10.5M+     | AIsa Network            |
521| Weekly Volume       | 500K+      | Ecosystem-wide          |
522| Market Cap          | $815M      | Benzinga, CoinGecko     |
523| Settlement Speed    | 2 seconds  | Production avg          |
524| Supported Chains    | 5+         | Base, ETH, SOL, BNB     |
525| Active Facilitators | 10+        | Hosted + Self-hosted    |
526 
527## 🚀 Migration Guides
528 
529Comprehensive guides for migrating from traditional payment systems to x402.
530 
531### From Traditional Payment Processors
532 
533- [From Stripe to x402](https://docs.cdp.coinbase.com/x402/migrate/stripe) - Migrate subscription and one-time payments from Stripe to x402 for crypto-native payments with instant settlement.
534 
535### From Authentication to Payments
536 
537- [From API Keys to x402 Payments](https://docs.cdp.coinbase.com/x402/migrate/api-keys) - Replace API key-based access control with payment-per-use models.
538 
539### From Subscription to Usage-Based
540 
541- [From Subscription to Pay-Per-Use](https://docs.cdp.coinbase.com/x402/migrate/subscriptions) - Transform monthly subscriptions into granular pay-as-you-go pricing.
542 
543## 🔒 Security & Audits
544 
545Security resources and best practices for x402 implementations.
546 
547### Smart Contract Audits
548 
549- Coinbase x402 Security Audit - Official security audit of x402 protocol smart contracts.
550- [EIP-3009 Security Analysis](https://eips.ethereum.org/EIPS/eip-3009#security-considerations) - Security considerations for TransferWithAuthorization.
551 
552### Security Best Practices
553 
554- [x402 Security Checklist](https://docs.cdp.coinbase.com/x402/security/checklist) - Production deployment security requirements.
555  - Signature verification best practices
556  - Replay attack prevention
557  - Nonce management strategies
558  - Rate limiting and DDoS protection
559 
560- [Payment Verification Guide](https://github.com/coinbase/x402/blob/main/SECURITY.md) - Proper payment verification implementation.
561  - Facilitator trust models
562  - On-chain verification fallbacks
563  - Amount and recipient validation
564 
565- [Key Management](https://docs.cdp.coinbase.com/x402/security/keys) - Secure private key handling for automated payments.
566  - Hardware wallet integration
567  - Key rotation strategies
568  - Multi-signature setups for high-value
569 
570### Known Vulnerabilities & Mitigations
571 
572- [CVE Database](https://github.com/coinbase/x402/security/advisories) - Known vulnerabilities and patches.
573- [Replay Attack Prevention](https://docs.cdp.coinbase.com/x402/security/replay) - Nonce and deadline handling.
574- Front-Running Mitigation - MEV protection strategies.
575 
576### Bug Bounty Programs
577 
578- [Coinbase Bug Bounty](https://hackerone.com/coinbase) - Report x402 vulnerabilities for rewards up to $50,000.
579- [Immunefi x402 Program](https://immunefi.com) - Decentralized bug bounty platform.
580 
581### Security Monitoring
582 
583- [Rate Limiting Tools](https://docs.cdp.coinbase.com/x402/security/rate-limiting) - Prevent abuse and ensure service availability.
584- [PaySentry](https://github.com/mkmkkkkk/paysentry) - Control plane for AI agent payments. Spending limits, circuit breakers, anomaly detection, and audit trails for x402 integrations. npm: `@paysentry/x402`.
585 
586### Spending Controls & Policy Enforcement
587 
588- [PolicyLayer](https://policylayer.com) - Non-custodial spending controls for AI agents with crypto wallets. Enforces daily spending limits, per-transaction caps, recipient whitelists, and rate limiting without holding private keys.
589 
590## 🔗 Related Protocols
591 
592Adjacent protocols and standards.
593 
594### Payment Protocols
595 
596- [Lightning Network](https://lightning.network/) - Bitcoin Layer 2 micropayments.
597- [Stellar](https://www.stellar.org) - Cross-border payments.
598- [Request Network](https://request.network/) - Payment request protocol.
599 
600### Web Standards
601 
602- [HTTP Status Codes](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status) - Complete reference.
603- EIP-3009 - TransferWithAuthorization.
604- [ERC-20](https://eips.ethereum.org/EIPS/eip-20) - Token standard.
605 
606### AI & Agent Protocols
607 
608- Model Context Protocol (MCP) - Anthropic's context standard.
609- [Agent Protocol (AP2)](https://agentprotocol.ai/) - Agent communication standard.
610- [OpenAI Function Calling](https://platform.openai.com/docs/guides/function-calling) - Tool use API.
611 
612### Historical Reference
613 
614- 21.co Micropayments - Early Bitcoin micropayment attempt (2015).
615- [HTTP 402 Proposal](https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html) - Original RFC (1999).
616 
617## 🤝 Contributing
618 
619Contributions welcome! Please read the [contribution guidelines](CONTRIBUTING.md) first.
620 
621### How to Contribute
622 
6231. Search existing resources to avoid duplicates
6242. Make an individual pull request for each suggestion
6253. Use the following format: `[Resource Name](link) - Description.`
6264. New categories or improvements to the existing structure are welcome
6275. Check your spelling and grammar
6286. Ensure your text editor removes trailing whitespace
629 
630### What to Contribute
631 
632✅ **Encouraged:**
633- New implementations in different languages
634- Production use cases and case studies
635- Tutorials and educational content
636- Tools and utilities that extend x402
637- Integration examples with popular frameworks
638- Documentation improvements
639 
640❌ **Please Avoid:**
641- Spam or promotional links
642- Duplicate resources
643- Incomplete or broken projects
644- Resources not directly related to x402
645 
646### Pull Request Guidelines
647 
648- Title: Use format `Add [Resource Name]` or `Update [Section]`
649- Description: Briefly explain what you're adding and why it's useful
650- Testing: Ensure any code examples work as expected
651- Links: Verify all links are accessible and correct
652 
653### Issue Guidelines
654 
655- Use issue templates when available
656- Search existing issues before creating new ones
657- Provide context and examples for bug reports
658- Be respectful and constructive
659 
660## Awesome Lists
661 
662Looking for more awesome lists?
663 
664- [sindresorhus/awesome](https://github.com/sindresorhus/awesome) - The awesome list of awesome lists.
665- [Awesome Blockchain](https://github.com/yjjnls/awesome-blockchain) - Blockchain resources.
666- [Awesome Web3](https://github.com/ahmet/awesome-web3) - Web3 development.
667- [Awesome Ethereum](https://github.com/ttumiel/Awesome-Ethereum) - Ethereum development.
668- [Awesome Crypto](https://github.com/sobolevn/awesome-cryptography) - Cryptography resources.
669 
670---
671 
672<p align="center">
673  <b>🚀 Built with ❤️ by <a href="https://www.xpay.sh">xpay✦</a></b><br>
674  <sub>Helping the agentic community get paid and pay safely!</sub><br>
675  <sub>If this helped you, please ⭐ star the repo and share it!</sub><br><br>
676  <a href="https://x402.org">Official x402 Website</a> •
677  <a href="https://github.com/coinbase/x402">Protocol Repo</a> •
678  <a href="https://docs.cdp.coinbase.com/x402">Documentation</a> •
679  <a href="https://discord.gg/x402">Discord</a> •
680  <a href="https://twitter.com/x402org">Twitter</a>
681</p>
682