Awesome X402 MCP Server

Awesome X402

⚡ The Ultimate x402 Resource Hub - Everythng 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.

Contents

• 🎯 Quick Start - Become an x402 Champion
• 📚 Official Resources
• 📖 Protocol Documentation
• 🚀 Quickstart Guides
• ⚙️ Protocol Implementations
• 🏭 Production Implementatdions
• 🛠️ SDKs & Client Libraries
• 🔧 Server Frameworks & Middleware
• 🏗️ Facilitators
• 💡 Example Applications
• 🎨 Use Cases & Patterns
• 🤖 AI Agent Integration
• 🔨 Tools & Utilities
• 🧪 Testing & Development
• 📚 Tutorials & Learning Resources
• 🎥 Videos & Talks
• 📝 Articles & Blog Posts
• 👥 Community
• 🌟 Ecosystem Projects
• 📊 Ecosystem Market Data
• 🚀 Migration Guides
• 🔒 Security & Audits
• 🔗 Related Protocols
• 🤝 Contributing
• Awesome Lists

The 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.

🚀 Start building in 5 minutes | ⚡ 2-second settlement | 💰 USDC on Base

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🎯 Quick Start - Become an x402 Champion

New to x402? Follow this path to mastery:

1. 5-Minute Quickstart - Accept your first payment.
2. Choose Your Stack - Find your language/framework.
3. Copy an Example - Working code you can run immediately.
4. Join the Community - Get help from other builders.

For AI Agents: Start with MCP Integration to enable Claude/other agents to make autonomous payments.

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📚 Official Resources

Core resources from the x402 protocol maintainers.

• 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.
  • Payment Schemes - Different payment flow types.
  • EVM Implementation - Ethereum Virtual Machine specifics.

📖 Protocol Documentation

Essential documentation for understanding and implementing x402.

• How x402 Works - Complete payment flow explanation with diagrams.
• Payment Requirements Schema - JSON structure for payment requests.
• Payment Payload Format - Client payment submission format.
• Verification & Settlement - Payment validation process.
• EIP-3009 TransferWithAuthorization - Gasless transfer standard used by x402.
• HTTP 402 Status Code - The long-dormant HTTP status.

🚀 Quickstart Guides

Get started with x402 in minutes.

• 5-Minute Quickstart for 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.

⚙️ Protocol Implementations

Official and community implementations of the x402 protocol.

Go

• coinbase/x402 ⭐ Official - Complete Go implementation.
  • Core protocol types and utilities
  • Payment verification and settlement logic
  • Multi-chain support (Base, Base Sepolia, Ethereum, Solana)

TypeScript/JavaScript

• x402-typescript ⭐ Official - Complete TypeScript implementation.

  • Core protocol types and utilities
  • Payment verification and settlement logic
  • Multi-chain support (Base, Base Sepolia, Ethereum, Solana)

• x402-data-api - HTTP 402 micro-payment data API with Base chain USDC payments. 16 developer data tools including email validation, DNS lookup, WHOIS, SSL check, and IP geolocation with x402 payment integration.

• x402-express - Express.js middleware example.

• hive-rosetta ⭐ Community - Open EIP-3009 transferWithAuthorization signer. Zero ethers/web3 dependency, primitives-only EIP-712. Returns wire shape {scheme: 'exact', network: 'eip155:8453', payload: {authorization, signature}}. Same package name on PyPI. (GitHub)

Python

• x402 ⭐ Official - Python SDK on PyPI.

  • FastAPI middleware integration
  • Requests session with auto-payments
  • Payment requirement generation

• ag402 ⭐ Community - Payment layer for AI agents using x402. Wrap any API or MCP server with a USDC paywall (ag402 serve), or let agents auto-pay (ag402 run). Solana USDC, ~0.5s settlement, non-custodial, 648+ tests. Glama

• x402-pay - Call any x402 API with one API key. Routes requests through a broker that handles on-chain payment. httpx-based, optional wallet mode for direct payments. (GitHub)

• hive-rosetta ⭐ Community - Direct port of the Node hive-rosetta signer. Byte-identical EIP-712 digest across both languages. Returns {scheme, network, payload} matching CDP /verify and /settle. (GitHub)

Rust

• x402-rs ⭐ Community - Production-grade Rust implementation.
  • Axum middleware
  • Reqwest client wrapper
  • Self-hostable facilitator
  • Multi-chain support
• x402-axum - Axum web framework integration.
• x402-reqwest - Reqwest HTTP client wrapper.

🏭 Production Implementations

Real companies using x402 in production with proven scale and transaction volumes.

High-Volume Production Deployments

• Arch Tools - 58 production API tools for AI agents with x402 payments built in. Web scraping, AI generation, crypto data, OCR, browser automation, MCP compatible. Patent-pending agent auth. 15+ chains supported. (GitHub)
• PayAPI Market - First marketplace for x402-powered APIs. 10 APIs, 65 endpoints: UK property data, email verification, company enrichment, postcode lookup, currency/crypto rates, screenshots, DNS intelligence, web scraping, IP geolocation, QR codes. $0.001–$0.01 USDC on Base per request. MCP server discovery. (GitHub)
• Rug Munch Intelligence - 117 MCP tools + 19 REST API endpoints for crypto data: DexScreener, Birdeye, GMGN, Arkham, Nansen, Dune, Jupiter, DeFiLlama, and more. $0.001-$0.02 USDC per call. Multi-chain (Base + Solana), free trial (1 call/IP), OpenAPI spec, no API keys, no signup. (Discovery | OpenAPI | MCP Catalog | Solana | GitHub)
• AIsa - Leading x402 payment processor with 10.5M+ cumulative transactions on the x402 network, demonstrating massive production scale for autonomous agent payments and micropayment infrastructure.
• Bitget - Major cryptocurrency exchange integrating x402 for seamless payment flows, enabling instant settlements and gasless transfers for trading operations.
• Stratalize — 100+ attested financial, healthcare, real estate, and governance intelligence tools with x402 micropayments on Base. Ed25519-signed outputs on every synthesis. $0.02–$1.00 USDC per tool call. MCP registry: com.stratalize. (x402.json)
• Coinbase Developer Platform - Official CDP implementation processing hundreds of thousands of transactions weekly with enterprise-grade reliability and 2-second settlement times.
• Cloudflare Workers - Edge computing platform with x402 integration serving global distributed payment verification at scale across 300+ data centers.
• GigSoul AI Research Agent - 23-endpoint AI research API for consultants: SEC filings, earnings calls, competitor analysis, market research, and document intelligence. - Cloudflare Workers - Edge computing platform with x402 integration serving global distributed payment verification at scale across 300+ data centers..01 USDC per call on Base mainnet. Wallet: x2b6c16fb557291b98222a570526ff2430848b723. (OpenAPI | .well-known/x402.json)
• Zuluworks AI — Sovereign Shaka PQC-Shield Factory - Autonomous A2A factory on Cloudflare Workers selling 5 post-quantum-hardened agent services via x402 USDC on Base L2: quantum-shield ($0.10, ML-KEM-768 PQC tunnel — NIST FIPS 203), kya ($0.01, agent trust scoring), browser-rendering ($0.03, headless browser extraction), memory ($0.05, semantic recall on a PQC knowledge index), workers-ai ($0.02, Llama 3.1 inference). All settlement routed through Coinbase CDP facilitator for Bazaar indexing. (Agent Card | Bazaar Manifest | MCP | Sitemap)

Production Success Metrics

Key Performance Indicators:

• 10.5M+ transactions - AIsa cumulative network volume
• 500K+ weekly transactions - Ecosystem-wide payment activity
• $180M+ market cap - Combined ecosystem valuation
• 2-second settlement - Average production payment finality
• 10,000%+ growth - Year-over-year transaction volume increase

Multi-Chain Production Support

Data & Social APIs

• Pyrimid - Agent commerce protocol for x402-style USDC payments on Base. Includes on-chain vendor/product registry, payment router, affiliate attribution, MCP endpoint, and live catalog API for agent-discoverable paid services. Current mainnet proof: 3 vendors, 8 on-chain products, 4 routed test payments. (Catalog) (MCP) (Skill)

• Polybot Arb Intelligence — Real-time cross-platform prediction market arb data (Polymarket+Kalshi+Myriad). x402 USDC on Base. Live API

• Aigregator - Structured data on 5,336+ AI tools via REST API and MCP server. Search, compare, and retrieve tool profiles. USDC micropayments on Base. (MCP Server)

• Xquik - Real-time X (Twitter) data API with 7 MPP/x402 pay-per-use endpoints — tweet lookup, tweet search, user lookup, follower check, article extraction, media download, and trends. No accounts or subscriptions required. (GitHub) (npm) (MCP Server)

• agentsvc.io - 20 utility tools for AI agents via x402 USDC micropayments on Base. Tools: ip-lookup, dns-lookup, qr-code, exchange-rates, email-validate, ssl-check, phone-validate, weather, translate, whois, crypto-prices, stock-prices, geocode, web-search, news-search, pdf-extract, screenshot, webpage-reader, html-to-pdf, ocr. $0.001–$0.008 USDC per call. No API keys, no signup. Auto-discovery: /.well-known/agent-services.json | Catalog | OpenAPI | MCP Server | (GitHub)

• AgentData API - Real-time crypto market data for AI agents. 16 pay-per-request endpoints on Base Mainnet: prices, funding rates, volatility, liquidation levels, DeFi yields, cross-exchange arbitrage, technical indicators (RSI/MACD/BB/ATR), support/resistance, sentiment, stablecoin health, and historical OHLCV. Self-hosted facilitator, no accounts required. Supports x402 v2 with Bazaar discovery extension. (Discovery) (OpenAPI)

• Fly Labs Agentic Market - YouTube data APIs for AI agents, paid in USDC on Base. Two endpoints live: POST /api/agents/transcribe ($0.03) returns a stable v1.0 JSON payload with verbatim transcript, language, time-indexed paragraphs, creator chapters, and canonical metadata (captions when available, Whisper fallback otherwise, no LLM rewrites). POST /api/agents/engagement ($0.02) returns view/like/comment counts, derived ratios, a composite engagement score, channel info (subscribers included), and full video context (tags, categories, thumbnail, availability, live status). Transparent cache on every response (cache.hit, cachedAt, ageSec) — transcripts are permanent, engagement refreshes every 6 hours. Typed error codes, OpenAPI 3.1, no signup. (OpenAPI 3.1) (Manifest)

• NicheData KDP Intelligence - Niche demand and competition intelligence for Kindle Direct Publishing authors. AI agents query keyword-level data including demand scores, competition intensity, BSR ranges, revenue estimates, and pricing analytics. $0.03 USDC per query on Base via CDP Facilitator. Free discovery endpoint lists all available niches. (OpenAPI) (Docs)

• DevDrops - 22 pay-per-query data APIs for AI agents — prediction markets (Polymarket + Manifold), property intelligence, sports odds, regulatory filings, FX rates, weather, IP geolocation, academic papers, document summarisation (Claude), and more. $0.001–$0.10 USDC per query on Base. No API keys or subscriptions. (OpenAPI) (Catalog)

• Social Intel — Instagram influencer search API for AI agents. Search by niche, country, demographics, or follower count → returns usernames, bios, follower counts, business categories, and public business emails. Single-profile lookup at $0.01; full search $0.50–$1.30 (100 leads). USDC on Base, Solana, Polygon, Arbitrum. No signup. (OpenAPI) (MCP Server) (Demo)

• GlobalAPI - Compliance and macro-economics API hub for AI agents across 43 endpoints. Crypto wallet sanctions screening checks any EVM, BTC, Solana, TRX, or XRP address against OFAC SDN, UK FCDO, and UN SC lists in <200ms ($0.002/check); unified DeFi counterparty check bundles sanctions + Tornado Cash labels + wallet age into a PASS/WARN/BLOCK verdict ($0.01). Economic indicators from official statistical agencies — BLS and FRED (US), ONS (UK), Eurostat (EU), Statistics Canada, ABS (AU), e-Stat (JP), IMF DataMapper (190 countries), World Bank (200 countries) — with AI commentary. Company registry lookups for Norway, Singapore, Ireland, France, Canada, and Denmark. No API key — x402 USDC on Base mainnet, $0.002–$0.10/call. (OpenAPI | Discovery)

• TOUGH LOVE SECURITY ImageGen - Pay-per-image AI generation powered by Cloudflare Workers AI (Stable Diffusion XL Lightning + Flux-1-Schnell). Three tiers: $0.50 single, $1.99 12-pack, $7.99 100-bundle. Stripe Checkout for humans, x402 for agents at $0.04/image. No accounts, no expiring credits. (Launch post)

• TOUGH LOVE SECURITY ClawWork - Instant AI labor marketplace with three tiers: $5 quick polish (90s turnaround), $25 deep brief (1.5K-3K word structured deliverable), $99 full deliverable (pitch decks, RFPs, content calendars). Stripe + x402 ($0.05/call on bulk). Powered by Claude 4.7 Sonnet. (Launch post)

• TOUGH LOVE SECURITY Contract Risk Score - Smart contract risk scoring API for DeFi devs. Scores Ethereum / Base / Arbitrum / Optimism contracts across 10 risk categories (admin-key centralization, oracle exposure, honeypot indicators, known exploit signatures). $1.25 per 5-pack via Stripe, $0.25/call via x402. Triage layer between "free Etherscan glance" and "$50K formal audit." (Launch post)

• Deepnets - Solana token intelligence: safety analysis, deep wallet-funding-network mapping, holder breakdowns, social/Twitter research, trending feed, streamflow/staking lockup data. 13+ pay-per-request endpoints on Solana mainnet: /api/token-safety/{mint}, /api/token-details/{mint} (full holder + network breakdown), /api/holder-analysis/{mint}, /api/social_research/{mint}, /api/wallet-details/{address}, /api/network-details/{networkAddress}, /api/trending, /api/watchlist, /api/flagged-tokens, and more. $0.01 basic / $0.15 holder analysis. USDC on Solana, gas sponsored by the facilitator — no SOL needed. v2 with Bazaar discovery extension. (OpenAPI) (Docs) (Marketing)

• OpenPulsechain - PulseChain blockchain analytics API with 28 x402-paid endpoints: token safety scores (0-100), opportunity signals, whale alerts, pair analytics (price impact, volatility), deployer reputation, AML funding tree, smart money feed, gas price, OHLCV history. Covers 5,900+ tokens. $0.001–$0.03 USDC per call on Base. (x402 Discovery) (npm MCP) (GitHub)

• DataFood (TOUGH LOVE SECURITY) - Universal data hub for AI agents — 17 cross-niche sources (crypto prices, ETH gas, weather, news, HN, GitHub trending, DeFi yield, token risk via GoPlus, HHS healthcare-breach feed, geocoding, more) behind one POST /api/data/bundle call. Bundle micropayments save up to 92% vs per-API alternatives. Day pass $0.99 unlimited 24h, week pass $4.99. Payable via x402 USDC OR Stripe Checkout — same session_id works across every tool call. Free 1-row preview at /api/data/preview?type=…&q=…. (Live demo) (MCP server) (x402 descriptor) (catalog)

• Askew - Security and DeFi intelligence for AI agents. 5 pay-per-call endpoints on Base mainnet: /yields ($0.002, live APY across 5 chains via DefiLlama), /staking/router ($0.003, SOL/ATOM native vs liquid staking routing), /research/query ($0.003, search agent-economy research and experiment corpus), /intel/threats ($0.002, Guardian security threat summary), /intel/feed ($0.005, combined research + threats + staking strategic feed). Free preview at /yields/preview and /health. Self-hosted facilitator (xpay.sh). Auto-discovery: (/.well-known/x402.json | llms.txt | /offers)

• BitBooth - 6 utility, content, and security endpoints for AI agents on Base mainnet, settling via Coinbase CDP Facilitator. Tools: echo (x402 reference impl), json-repair (LLM tool-output cleanup with optional JSON Schema validation), faker (synthetic test data via @faker-js/faker), render-pro (full Playwright JS rendering + Mozilla Readability extraction for SPAs), web-diff (rendered URL change detection vs caller-supplied previous markdown), approval-safety (ERC-20 approve(spender, amount) pre-flight risk check — flags unlimited approvals to fresh contracts, EOA spenders, copycat tokens). $0.001 USDC per call for utility tier, $0.05 for premium tier. No API keys, no subscriptions. Self-hosted discovery at bazaar.json. (GitHub)

• EconDash - Global macroeconomic data API for AI agents: 753 indicators across 298 countries (World Bank, FRED, OECD). 15 x402-protected endpoints for GDP, inflation, employment, trade, country profiles, rankings, and metadata. $0.02 USDC/call on Base. Also supports MPP (Tempo + Solana). (Docs) (OpenAPI)

Games & On-Chain Apps

• Flipr — On-chain coin flip game on Base (Chainlink VRF). Agents pay live USDC quote (~$1.23) per flip; pots paid in ETH. Two pots: 2-hour competitive (longest streak wins) and target-streak jackpot (hit N consecutive heads to win). Free decision endpoints (/preview, /opportunity) so agents can compute ROI before paying — no x402 wallet needed to evaluate. Speaks x402, MCP, and A2A simultaneously. (OpenAPI) (Agent Card) (MCP Server) (Game Info)
• Contract Risk Checker - AI-powered legal contract analysis for autonomous agents. Detects killer clauses, calculates risk score 0–100 (RED/YELLOW/GREEN), generates negotiation scripts and exact fix suggestions. Supports PDF, DOCX, TXT up to ~600 pages. $10 USDC per analysis on Base + Solana. No subscription, no account. (Docs)
• Invoice Parser - Structured invoice data extraction for finance automation agents. Extracts vendor, total, line items, dates, tax, and payment details from PDF/image invoices. Returns clean JSON ready for accounting systems. $0.10 USDC per parse on Base. No API keys, no signup. (Docs)

Enterprise Adoption

Major 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).

🛠️ SDKs & Client Libraries

Client libraries for making x402 payments.

JavaScript/TypeScript

HTTP Clients

• cipher-x402-client - Lightweight TS/JS x402 v2 client. Zero runtime deps, native fetch, ESM + CJS dual build. 34 tests, 89% coverage. Node 18+ / browsers. Optional ethers peer dep for signing.
• x402-got - Got HTTP client integration.

AI Agent SDKs

• PayBot SDK - TypeScript SDK for integrating x402 payments into AI agents and bots. Supports automatic 402 detection, wallet management, and USDC payments on Base. (npm)
• ClawPay MCP - Non-custodial x402 payment layer for AI agents. Agents sign locally with their own keys — no custodial infrastructure needed. Supports automatic 402 detection and USDC payments on Base. (npm)
• Azeth SDK - TypeScript SDK with x402 client (fetch402), ERC-4337 smart accounts, on-chain reputation feedback after every x402 call, and ERC-8004 service discovery. USDC on Base. (npm)
• MoltsPay - Payment infrastructure for AI agents with x402 support. CLI, TypeScript SDK, and LangChain/CrewAI integrations. Gasless payments on Base, Polygon, Solana, BNB, Tempo. Spending limits and multi-chain support. (npm)

Wallet Integration

• Agent Wallet SDK - Non-custodial smart contract wallets for AI agents with on-chain spend limits and operator model. Base L2. (npm)
• viem - TypeScript library used for signing payments.
• ethers.js - Alternative Ethereum library.

Rust

• alloy - High-performance Ethereum library.

🔧 Server Frameworks & Middleware

Server-side integrations for accepting x402 payments.

Node.js/TypeScript

Multi-Framework

• monapi - One-line API monetization SDK. Wraps x402 setup into a single function call. Express, Next.js, and MCP support. Per-route pricing, Base/Arbitrum/Polygon, gas-free agent payments via EIP-3009. (npm) (GitHub)
• autonomagic-marketplace - Plugin marketplace primitive for x402. Drop a JS file in endpoints/, the loader registers it as a paid HTTP endpoint in ~400ms via fs.watch (no restart, no manifest edits). Generates Bazaar-shape 402 challenge with EIP-712 extras, /.well-known/x402.json manifest, agent-card, and OpenAPI spec automatically. Zero runtime dependencies. Production-extracted from api.autonomagic.org's 22 paid endpoints. (npm) (GitHub)

Express / Hono

• @moltrust/x402 - Trust score middleware for x402 endpoints. One line: app.use(requireScore({ minScore: 60 })). Extracts paying wallet from X-Payment header, looks up MolTrust trust score, blocks agents below threshold with 403 + registration link. Zero dependencies. (npm) (GitHub)
• @larkinsh/x402 - Authorization middleware for x402 endpoints. One line: preflight(handler, { minScore: 40 }). Gates by a 5-dimension trust score (wallet age, tx history, counterparties, funding source, ERC-8004), returns Ed25519-signed receipts verifiable with only the public key, supports block / warn / surcharge modes. Hono / Express / Next adapters. (npm) (GitHub)

Next.js

• x402-next - App Router middleware.
• Next.js route protection - Complete app example.
• Mainnet production example - Base mainnet ready.

Hono

• Browser wallet example - React + Hono full-stack.
• Azeth Provider - Hono middleware for gating endpoints behind x402 payments with payment-agreement support for recurring agent-to-agent billing. (npm)

Python

FastAPI

• FastAPI example - Complete implementation.

Client Libraries

• x402 Payment Harness - Python library + CLI for x402 payments without requiring Coinbase CDP wallet. Works with any Ethereum EOA. Full HTTP 402 -> EIP-712 sign -> X-PAYMENT header flow. pip install x402-payment-harness. (PyPI)
• MoltsPay Python - Python SDK for x402 agent payments. LangChain compatible. Auto-creates wallets, discovers services, pays via x402. Multi-chain: Base, Polygon, Solana, BNB. (PyPI)

Rust

Axum

• Axum server example - Full implementation.

🏗️ Facilitators

Payment verification and settlement services.

Hosted Facilitators:

• Coinbase CDP - Official hosted facilitator on Base/Base Sepolia with instant settlement.
• Cloudflare x402 - Edge computing facilitator on Base/Ethereum with deferred settlement.
• BNB Chain Pieverse - BNB Chain facilitator with instant settlement.
• AsterPay - European x402 Facilitator with EUR off-ramp via SEPA Instant. MiCA compliant, ERC-8004 ready, ElizaOS plugin. First European-focused x402 infrastructure.
• FluxA - Hosted x402 facilitator for AI agent payments. Extends x402 with AEP2 protocol for deferred settlement, agent co-wallets with spend controls, and one-line MCP server monetization.
• MERX x402 for TRON - First TRON facilitator. Supports USDT, USDC, USDD on TRON mainnet. Sub-3-second confirmation for micropayments. Express middleware, documentation.
• Primev FastRPC - Fee-free facilitator on Ethereum mainnet with sub-200ms settlement via mev-commit preconfirmations. ERC-8004 registered (Agent #23175).
• Voidly Pay - USDC-backed agent-to-agent payment rail on Base mainnet. Source-verified vault (0xb592…1c12), public proof of reserves at /v1/pay/proof, facilitator-signed quotes (anti-MitM). Ed25519-signed envelopes; 28-tool MCP server @voidly/pay-mcp; TypeScript + Python SDKs; Express/Hono/Flask/FastAPI middleware. Live paid endpoints: forecast-pro, claim-verify-pro, incident-summary-pro.
• Satoshi Facilitator - Independent x402 facilitator for Bitcoin-focused pay-per-call services with Base, Base Sepolia, Solana Mainnet, and Solana Devnet support. Supported networks
• AlgoVoi - Multi-chain x402 facilitator spanning EVM (Base, Tempo), SVM (Solana), AVM (Algorand, VOI), Stellar, and Hedera on a single endpoint. Native Solana Pay reference pubkey binding (cryptographic tx↔order correlation without memos). Also implements MPP and AP2 at the same URL. Open-source MCP adapter.
• x402-saas - Hosted facilitator + zero-SDK onboarding proxy on Base. SIWE auth, slug-routed multi-tenant data plane, 1% of routed USDC volume. MIT-licensed self-host alternative at x402-kit. Live demo at /__x402/health.

Self-Hosted Facilitators

• x402-rs Facilitator - Production-grade Rust facilitator.
  • Docker deployment support
  • Multi-chain configuration
  • REST API endpoints (/verify, /settle)
• Running Your Own Facilitator - Setup guide.
• @facilitator/eip7702 - Support for all EVM blockchains (BNB, Polygon, etc.), all tokens (USDT, DAI, WBTC, etc.), and all native coins (POL, AVAX, etc.).
• agenticpay facilitator (npm) - Open-source TypeScript facilitator for Solana (devnet + mainnet). Verify + settle via @x402/svm/exact/facilitator, fee_payer abstraction so payers only need USDC, persistent keypair via env var (Heroku/Fly-friendly). Hosted devnet endpoint: https://agentpay-facilitator-e9b20a5fee6a.herokuapp.com.

💡 Example Applications

Full working examples and templates.

Full-Stack Applications

• Weather API Service - Simple paid API endpoint.
• Next.js App - Complete web application.
• Video Paywall - Premium content access tutorial.
• Browser Wallet Template - React + Hono + Session management.
• x402 Boilerplate — Conflux eSpace - 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.
• 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.
• Agent Arena - 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.
• CIPHER Premium - Next.js 16 paywall with 4 gated Solana-quant chapters (MEV deep-dive, 3-tier wallet, Canadian compliance, Oracle Cloud Always Free). $0.25 USDC/Base per fetch. Hand-rolled proxy.ts, no facilitator deps at advertise time.

API Examples

• Daizyx402 Security Research API - AI-powered smart contract security analysis and DeFi vulnerability research by autonomous agent. $0.05 USDC per query, $0.50 USDC deep analysis on Base mainnet. No signup required.

• tx402.ai - Agent-native LLM inference gateway. 20+ EU-hosted models (DeepSeek, Qwen, Llama, GLM, Mixtral) via x402 USDC micropayments on Base. OpenAI-compatible API, SSE streaming, GDPR-compliant, zero data retention. No API keys — wallet is auth. Models | OpenAPI | llms.txt | Source

• SolSignal API - Solana token safety scanner — aggregates DexScreener, RugCheck, GoPlus & Jupiter simulation into one SAFE/CAUTION/AVOID/RUG verdict in <2s. 10 free scans/day, $0.01 USDC per call on Solana. Source

• x402 Gateway - Simple Node.js API gateway for AI agents. Weather ($0.01), crypto prices ($0.01), exchange rates ($0.005), news ($0.02). USDC on Polygon. HTTPS via Cloudflare Tunnel. Source

• Alfred's Digital Bazaar - ~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

• Banking Bodyguard - Real-time cbBTC whale movement signals on Base. Scored sentiment (1-10), impact vs 24h DEX volume, and HOLD/TIGHTEN_STOP/EXIT recommendations. ~500K signals indexed. x402 enforced — $0.10 USDC per call on Base. Docs

• • Banking Bodyguard - Real-time cbBTC whale movement signals on Base. Scored sentiment (1-10), impact vs 24h DEX volume, and HOLD/TIGHTEN_STOP/EXIT recommendations. ~500K signals indexed. x402 infrastructure live (first payment tx), currently in free pilot during CDP facilitator integration. $0.10 USDC per call on Base. Docs

Documentation truncated — see the full README on GitHub.