Every open-source x402 project we track — SDKs, facilitators, gateways, middleware and demos — ranked by GitHub stars.
x402 revives the HTTP 402 "Payment Required" status code so a server can charge for an HTTP resource — usually USDC on Base/EVM/Solana via a signed transfer. It's become the reference rail for charging AI agents per API request and per MCP tool call.
The projects below are drawn live from our ecosystem dataset and classified by protocol. Start with the highest-starred SDKs and facilitators, or compare x402 with related standards.
Real projects from the directory · stars live from GitHub · sorted by popularity. Showing the top 60 of 1.2k.
Your AI trading terminal assistant for US stocks, commodities, forex, and crypto.
The agent-native LLM router for OpenClaw. 41+ models, <1ms routing, USDC payments on Base & Solana via x402.
A local-first AI agent with persistent memory, emotional intelligence, and a peer-to-peer skills economy.
The AI agent with a wallet — spends USDC autonomously to get real work done. Apache-2.0, TypeScript.
Daydreams is a set of tools for building agents for 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.
The trust layer for agent-to-agent commerce — natural-language mandates, ERC-7710 delegated permissions, x402 payments, escrow, and dispute resolution as one open, catch-all Agent Skill / Claude Code plugin.
The world's first privacy layer for AI agents on Solana — stealth addresses + x402 payments. Every payment lands at a fresh, unlinkable address.
Open Source AI trading agent that operates autonomously across 1000+ markets - Polymarket, Kalshi, Binance, Hyperliquid, Solana DEXs, 5 EVM chains. Scans for edge, executes instantly, manages risk while you sleep. Agent commerce protocol for machine-to-machine payments. Self-hosted. Built on Claude.
Live data for AI agents — search, research, markets, crypto, X/Twitter. Pay-per-call via x402 micropayments.
A curated collection of open source fintech libraries and resources.
x402 payments in Rust: verify, settle, and monitor payments over HTTP 402 flows
Publishes localhost services to the agentic web through self-hostable, trustless relays with x402 payments.
Drop-in OpenAI Python client with transparent x402 payment support.
🚀 Curated list of x402 resources: HTTP 402 Payment Required protocol for blockchain payments, crypto micropayments, AI agents, API monetization. Includes SDKs (TypeScript, Python, Rust), examples, facilitators (Coinbase, Cloudflare), MCP integration, tutorials. Accept USDC payments with one line of code. Perfect for AI agent economy.
Lucid Agents Commerce SDK. Bootstrap AI agents in 60 seconds that can pay, sell, and participate in agentic commerce supply chains. Our protocol agnostic SDK provides CLI-generated templates and drop-in adapters for Hono, Express, Next.js, and TanStack, giving you instant access to crypto/fiat payment rails (AP2, A2A, x402, ERC8004).
Client SDK for the Vybe x402 API. Pay-per-call USDC over HTTP and prepaid-credit WebSocket streaming for Vybe's Solana analytics API. Built for AI agents.
Autonomous AI BD Agent for SolCex Exchange: 24/7 Cross-Chain Token Scoring & Payments 2026
Drop-in OpenAI Typescript client with transparent x402 payment support.
An operating system built for AI agents — talk to your NixOS server instead of SSH-ing in. Typed, audited tool access with atomic rollback on every change. Research-grade; run it on a disposable box, not production.
Alephant is an open-source AI Agent Gateway for routing, tracking, and controlling LLM usage across AI agents, members, and workflows, and for publishing agent capabilities as paid endpoints with x402 and MPP payment rails.
A complete TypeScript implementation of the Python x402 payment protocol extension for A2A (Agent-to-Agent) communication. Enable your AI agents to request, verify, and settle crypto payments seamlessly.
HELP WANTED: AI AGENTS. Real bounties, real money, every payout sealed to a public ledger. The notice board for gofrantic.com
Client SDK, Claude plugin and skill framework for the Pinion protocol. x402 micropayments on Base.
An x402 project in the AI-agent payments ecosystem.
Next.js-like framework building AI Agents that are payment-native. Bootstrap your agent with A2A, MCP, x402 payments, and ERC-8004 identity.
Open-source 3D AI agent framework — GLB/glTF avatars with LLM brains, memory, emotions, and autonomous payments. MCP server · x402 · Solana/EVM · Three.js. Embed anywhere as a web component. Character studio, animation gallery, OAuth 2.1. Browser-native.
Give any AI agent a crypto wallet. Agents deserve access to money. Pay x402 APIs, receive USDC, check balances — autonomously. Works with Claude, LangChain, AutoGen, CrewAI, and any MCP client. EVM + Solana.
A high-performance, crypto-monetized AI microservice architecture implementing the x402 Protocol
The way AI coordinates and transacts. Routing and settlement layer for your agent economy.
Drop-in x402 payment middleware for Flask APIs. Machine-to-machine payments on Base chain.
A universal framework designed to allow agents and other utilities to transparently make machine payments using web infrastructure.
Building blocks for Agentic payments (x402, MPP, AP2) for TypeScript, Rust, Go, Python, Ruby, PHP, Lua, Kotlin and Swift.
Building blocks for Agentic payments (x402, MPP, AP2) for TypeScript, Rust, Go, Python, Ruby, PHP, Lua, Kotlin and Swift.
A decentralized micro-settlement protocol enabling autonomous AI agents to pay publishers for premium content via Circle Programmable Wallets and x402 nanopayments.
The brutally honest map of where AI-agent money actually flows. 51 rounds, 137 angles, 230+ platforms. 3 self-hosted x402 v2 endpoints + 3 tools in the official MCP Registry. 385K star distribution.
Opinionated React Native crypto x AI chat app boilerplate with embedded wallet support, conversational AI, and dynamic UI component injection
A fully modular, framework-agnostic, easy-to-extend SDK for building complex X402 payment integrations.
The first AA-native x402 payment stack on NERO Chain — facilitator, SDK, audited settlement contract, and a public playground showing AI agents paying APIs in USDC with paymaster-sponsored gas.
The best way to monetize AI applications & MCP, using x402, CDP Smart Wallets & Paymaster
Autonomous AI Agent Swarm framework with x402 self-executing wallets. Empowers LLM-driven agents to trade, bridge, and manage crypto treasuries without human intervention. The ultimate Agentic DeFi toolkit for 2026.
Autonomous AI Agent Swarm framework with x402 self-executing wallets. Empowers LLM-driven agents to trade, bridge, and manage crypto treasuries without human intervention. The ultimate Agentic DeFi toolkit for 2026.
The first SOL to BTC MCP Server for AI agents powered by x402 - Building in public everyday on livestream
Autonomous AI Agent Swarm framework with x402 self-executing wallets. Empowers LLM-driven agents to trade, bridge, and manage crypto treasuries without human intervention. The ultimate Agentic DeFi toolkit for 2026.
Accept instant blockchain micropayments in your Rails applications using the x402 payment protocol.
Transmits signed USDC payments over sound using a custom OOK audio modem with Goertzel detection. Compresses x402 handshakes to 138 bytes, settling on Base through 36 seconds of 2400 Hz beeping.
Autonomous AI Agent Swarm framework with x402 self-executing wallets. Empowers LLM-driven agents to trade, bridge, and manage crypto treasuries without human intervention. The ultimate Agentic DeFi toolkit for 2026.
x402 projects are open-source repositories that implement or build on the x402 payment standard — a scheme that revives HTTP 402 "Payment Required" so a server can charge for an HTTP resource (typically in USDC on Base/EVM/Solana). They include SDKs, facilitators, middleware, gateways, demos and agent kits.
We currently track 1.2k open-source x402 projects, generated live from our ecosystem dataset and ranked by GitHub stars.
Sorted by GitHub stars, the top x402 project we track is NoFxAiOS/nofx. The full ranked list is below and updates as star counts refresh.
Submit it from the Submit page. We crawl the repository, classify its protocol, and it appears here automatically if it matches x402.