x402 Guild - Discover x402 landscape

98 projects found

@x402/axios

Axios interceptor that automatically handles 402 Payment Required responses by signing payments and retrying requests.

@x402/fetch

Native fetch API wrapper that automatically handles 402 responses with payment signing and transparent retry.

thirdweb x402 SDK

Full-stack x402 SDK supporting 170+ EVM chains and 10,000+ tokens with React hooks and auto permit detection.

Coinbase AgentKit

Toolkit for AI agents with native x402 payment capabilities using CDP wallets and spending controls.

Coinbase Payments MCP

MCP server giving Claude, Gemini, and Codex access to wallets, onramps, and x402 payments with Bazaar discovery.

@x402/express

Express.js middleware for x402 payment verification and resource gating with one line of code.

@x402/hono

Hono framework middleware for x402 payments, ideal for Cloudflare Workers edge deployments.

Cloudflare Agents SDK

Cloudflare's Agents SDK with native x402 support for Workers and MCP servers, plus deferred payment scheme.

ampersend

Agent payment management platform from Edge & Node with observability, automation, and compliance controls.

CDP Facilitator (Coinbase)

Official x402 facilitator with fee-free USDC settlement on Base and Solana, KYT/OFAC compliance.

thirdweb Facilitator

Enterprise-grade facilitator supporting 170+ EVM chains and 10,000+ tokens via server wallet settlement.

PayAI Facilitator

Multi-chain facilitator supporting Avalanche, Base, Polygon, Sei, and Solana with no API keys required.

Hyperbolic

GPU inference API with x402 pay-per-millisecond pricing for AI models without API keys or subscriptions.

Firecrawl

Web scraping API turning websites into LLM-ready data with x402 pay-per-scrape pricing.

Neynar

Farcaster social data API allowing agents to pay per query for cast info and social graph data.

Daydreams Router

x402-enabled LLM inference router supporting all major providers for pay-per-inference nanoservices.

xNUWA

x402-native AI client with self-custodied wallet for browsing and paying AI agents automatically.

x402 Whitepaper

Official protocol specification and design rationale for the x402 payment standard.

Daydreams

The autonomous AI agent framework. Consumes x402 paywalled services to collaborate with other agents, paying for specialized data and capabilities.

ElizaOS

Multi-agent AI framework with native x402 support for autonomous payments, on-chain agent discovery (ERC-8004), and a marketplace to monetize agents.

Mogami Java Client SDK

Java SDK for bringing x402 payments into applications. Handles authorization, expiration, and signatures for seamless payment flows.

Mogami Java Server SDK

Turn any Spring Boot endpoint into a pay-per-call API with a single annotation. Handles payment verification, expiration, and signatures.

Mogami Facilitator

Self-hostable x402 payment gateway as a Docker image. Verifies and settles transactions in real time with private key protection.

Lucid Agents Commerce SDK

Bootstrap AI agents in 60 seconds that can pay, sell, and participate in agentic commerce. Drop-in adapters for Hono, Express, Next.js, and TanStack.

x402.rs (Rust SDK)

A fully modular Rust SDK for building complex x402 payment integrations. Framework-agnostic with maximum composability and extensibility.

Ekai

The universal context layer for your AI. Keep your context portable, persistent and yours across LLM models. Pay for inference using x402.

Oops!402

Oops!402 is a hosted remote MCP server (https://oops402.com/mcp) designed for AI assistants like ChatGPT and Claude. After connecting via OAuth, it gives agents a toolset to (1) create/manage a self-custodial wallet using Lit PKPs bound to the user’s OAuth identity, (2) discover x402-protected resources via the Coinbase Facilitator “Bazaar” discovery API, (3) discover x402-capable agents via ERC-8004/Agent0 registries, and (4) execute x402 payments as part of the agent’s plan → run loop.

Latinum Chrome Extension

Browser extension that captures x402 payment requests, displays invoices, and enables wallet integration for payment-gated experiences.

Corbits

Solana-first SDK to implement x402 flows quickly. Multi-network, multi-token, multi-scheme support with Mallory mobile toolkit.

Tokenmesa

Helps businesses launch service-backed tokens based on x402. Users pay through x402 with any token and auto convert to service token.

AI Frens

Launch x402-compatible AI character tokens. Fans can stake for perks, send tips, and pay for fun x402 services provided by AI characters.

Subnano

Micropayment content platform enabling creators to earn instantly. Readers pay with fee-less Nano (XNO) for what they actually read.

Numbers Protocol

Decentralized network for digital media provenance. Uses x402 for seamless payments for digital asset licensing and Receipt NFTs.

@x402/next

Next.js middleware for x402 payment verification and resource gating in App Router and Pages Router applications.

@x402/paywall

Modular paywall package for x402. Create custom paywall variations with built-in support for EVM and Solana payment backends.

Daydreams Facilitator

Production-ready payment settlement service for x402. Verifies cryptographic signatures and settles on EVM, SVM, and Starknet networks.

ChaosChain Facilitator

Decentralized x402 facilitator with BFT-verified runtime on Chainlink CRE. Consensus proofs and ERC-8004 identity for agent reputation.

AurraCloud

x402-driven AI agent infrastructure. Create AI agents in minutes with hosted MCP tools, smart wallet functionality, and x402-gated inference.

x402scan

Community-built explorer for x402 transactions. Real-time tracking, resource discovery, wallet integration, and SQL API-powered analytics.

Trusta Attestation

Publish attestations by paying USDC on Base via x402 API. Supports users and agents publishing attestations without complex interactions.

Zyte API

Unified Web Scraping API for unblocking, browser rendering and extraction with x402 pay-per-page pricing.

OpenMind x402

Built-in x402 input and action modules for robots. Give your robot full economic autonomy to buy electricity, transportation, and compute.

AxiomKit

Blockchain interaction framework integrating x402 for seamless payments within Sei network applications and AI agents.

Heurist Mesh

Library of composable crypto skills for AI agents. Equip your AI with expert crypto analysis abilities with full x402 and MCP support.

FluxA

Permissionless deferred payment rails for x402. Fast, parallel stablecoin micropayments with on-chain batch settlement at scale.

PEAC Protocol

Cryptographic receipt layer for x402. Returns signed PEAC-Receipt headers binding payment proof to delivered response, verifiable offline.

x402-secure

Real-time risk control for AI-driven x402 payments. Pre-payment agent risk checks and signal collection to prevent disputes and fraud.

x402.org Facilitator

Default testnet facilitator operated by x402 Foundation. Supports Base Sepolia and Solana Devnet for testing and development without production requirements.

Cloudflare x402

Edge payment processing facilitator integrated into Cloudflare's global network. Co-founder of x402 Foundation with Coinbase. Executes payment logic at infrastructure layer.

Nevermined Facilitator

AI agent payment verification and settlement infrastructure on Base network. Specialized in AI agent payment processing.

x402.rs Facilitator

Independent open-source Rust facilitator. Self-hostable, auditable, and neutral by design. Supports multiple EVM and Solana chains with production-grade performance.

OpenFacilitator

Free open-source facilitator with optional $5/month tier for custom domain and analytics. No technical skills required, unlimited requests, EVM + Solana mainnet support.

WorldFun Facilitator

x402 facilitator that enables fee-free EIP-3009 payments in USDC and other ERC-20 tokens, handling verification and settlement on Base.

AltLayer Facilitator

Hosted facilitator service at facilitator.altlayer.io that abstracts blockchain complexity. Part of AltLayer's x402 Suite with Gateway for decentralized agent hosting.

Trustline

Agent-native risk engine with decentralized Validator Agent Network (VAN). Comprehensive trust and risk management framework with institutional-grade security for AI agent payments.

AnChain.AI MCP

AML/sanctions screening for x402 using Model Context Protocol. Real-time compliance layer that screens counterparties against OFAC, FATF, and sanctions lists with sub-200ms on-chain risk checks.

AnChain.AI AML Platform

AI-powered AML compliance platform for crypto. Blockchain intelligence with wallet screening, sanctions lists, entity intelligence, and compliance-grade audit trails.

x402 Security Documentation

Official security documentation for x402 protocol. Covers security considerations, threat models, best practices, and vulnerability reporting procedures.

Coinbase Bug Bounty Program

HackerOne bug bounty program for reporting x402 vulnerabilities. Rewards for discovering and responsibly disclosing security issues in x402 protocol and implementations.

EIP-3009 Standard

TransferWithAuthorization standard enabling gasless USDC transfers. Implemented by Circle for USDC v2, allows facilitators to sponsor gas fees while users sign transfer authorizations off-chain.

EIP-2612 Standard

Permit extension for ERC-20 tokens enabling gasless approvals via signatures. Complements EIP-3009 for token authorization without gas costs.

EIP-7702 Standard

Account abstraction standard enabling gasless settlement in x402 v2. Used by thirdweb facilitator for gasless transactions across 170+ EVM chains.

t54 Labs GitHub Organization

GitHub organization maintaining x402-secure and related security infrastructure. Open-source risk control tools for agent payments.

0x402.ai

Premier cloud infrastructure for x402 that empowers anyone to become an x402 Facilitator in seconds with dedicated domains and isolated environments.

AltLayer

x402 gateway suite including facilitator and decentralized agent hosting. Provides x402 Facilitator for payment verification and settlement, plus x402 Gateway for processing payments.

Faremeter

Lightweight open-source x402 framework with client/middleware/server plugins. Plugin-based payment stack allowing agents and utilities to make web3 payments using web2 infrastructure.

x402-kit (Rust)

Fully modular Rust SDK for complex x402 payment integrations. Framework-agnostic and easy-to-extend SDK built for high-performance payment implementations.

QuickNode x402-rails

Ruby gem for adding paywalls to Rails applications. Server-side Rails engine with middleware and controller helpers to easily paywall API endpoints.

Cascade

Revenue distribution infrastructure for Solana and Base. First x402-native payment splitter enabling automatic splitting between contributors, partners, and platforms.

x402r

Non-custodial refund and arbitration protocol for x402. Enables dispute resolution and refund mechanisms for x402 transactions.

Nevermined

AI agent payment processing and settlement infrastructure. Facilitator for payment verification and settlement on Base network.

x402.jobs

Visual workflow builder for chaining paid x402 resources. Set markup and publish endpoints anyone can pay to run.

Proxy402

Turn URLs into paid content by Fewsats. Set a price, share your link, and collect payments instantly using x402 protocol for URL monetization.

zkStash

Permissionless shared memory layer for agents with x402 payment support. Sovereign memory layer for agentic economy with built-in x402 protocol.

MCPay

Build and monetize MCP servers. Open-source infrastructure for MCP and x402. Design, preview, deploy MCP servers and instantly monetize with per-call payments.

x402station

Leading x402 analytics platform with advanced UI. Real-time service monitoring with 200+ APIs across categories.

DappLooker AI

On-chain intelligence APIs with native x402 support. Real-time blockchain data intelligence for autonomous agents.

Meridian

Multi-chain facilitator with developer-first features. Payment rails for the agent economy with instant USDC settlements and AI agent interoperability.

RelAI

Monetize APIs with x402 micropayments across multiple networks. API monetization marketplace enabling pay-per-use models.

x402 GitHub Repository

Official open-source implementation of x402 - an open standard for internet native payments built on HTTP. Network, token, and currency agnostic payment protocol.

x402 Foundation

Official foundation established by Coinbase and Cloudflare in September 2025 to promote x402 as the universal standard for internet-native payments and AI-driven commerce.

x402 Ecosystem Directory

Official curated directory of 108+ projects, tools, and applications built on x402 protocol.

x402 Documentation

Official GitBook-based documentation site covering protocol concepts, implementation guides, client/server interactions, facilitator architecture, and use cases.

x402 V2 Protocol Launch

Major protocol upgrade released December 11, 2025, introducing multi-chain support by default, modular architecture, wallet-based access control, and automatic API discovery.

CDP x402 Documentation

Coinbase Developer Platform's official documentation for x402 protocol integration, covering core concepts, quickstart guides, embedded wallet integration, and SDKs.

x402 Payment Schemes Specification

Technical specification for different x402 payment flow types including exact payments, deferred settlements, and multi-chain payment schemes.

x402 EVM Implementation Specification

Detailed technical specification for implementing x402 exact payment scheme on Ethereum Virtual Machine compatible chains.

x402 Protocol Specifications

Complete technical specifications directory containing all protocol documentation including payment schemes, network implementations, and facilitator requirements.

@coinbase/x402

Official Coinbase facilitator package for TypeScript/JavaScript. Core NPM package providing client and server utilities for x402 payments.

x402-solana

Solana client/server implementation for x402. Complete Solana support with SPL token handling and sub-second settlement.

@x402/evm

EVM implementation with EIP-3009 support. Enables gasless USDC transfers on any EVM-compatible chain with TransferWithAuthorization.

x402-mcp

MCP integration for paid tools by Vercel. Enables Model Context Protocol servers to monetize tool usage with x402 per-call payments.

x402-got

Got HTTP client integration for x402. Extends the popular Got library with automatic x402 payment handling.

x402 Python SDK

Official Python SDK with FastAPI/Flask middleware. Complete Python implementation for building x402-enabled APIs and clients.

x402 Go SDK

Official Go implementation for x402. Production-ready Go SDK for building payment-gated services and clients.

x402 Java SDK

Official Java implementation for x402. Enterprise-grade Java SDK for building payment-gated APIs and clients.

Kobaru

Micropayment facilitator implementing x402 payment flows with APIs for supported payment kinds, verification, and settlement.

4Mica

Web3 payment infrastructure providing credit-backed settlement and facilitator support for x402 payment flows.