An open SDK for agentic payments. Let AI agents make payments, hold funds, and move money across chains with policy enforcement and human approval built in.

Golang Interface for Machine Payments Protocol by cp0x

An open-source, serverless and agentic design for pay-per-use AI content generation using USDC stablecoin payments via x402, featuring browser wallet and autonomous agent flows on AWS.

A curated list of protocols, specs, SDKs, and tools powering the emerging agentic commerce stack.

MCP server for 402 Index: discover 15,000+ paid API endpoints across L402, x402, and MPP

x402 micropayments for AI agents - no wallets, no blockchain, just credits.

Trust and quality infrastructure for AI agents. 225+ quality-scored capabilities, SQS scoring, EU AI Act support.

Payment gateway for MCP servers — monetize your tools with one wrapper. Supports x402, MPP, and Stripe.

Governed wallet for AI agents on Stellar with x402, MPP, policy controls, and auditable spend

Agentic Payments Protocol Demo - Interactive comparison of ACP, AP2, x402, and MCP payment protocols for AI agents

Autonomous AI-to-AI Nano payment toolset with MCP and HTTP APIs for machine-native transactions. Supports wallet balance checks, direct transfers, and payment request/status flows with deterministic responses, making integration fast, reliable, and framework-agnostic for autonomous agents.

Next.js • Hono • Express • Fastify • Elysia • NestJS • Cloudflare Workers • Vercel Edge • AWS Lambda • Deno + Session examples for pay-as-you-go billing

A unified SDK around the https://www.x402.org/ ecosystem, Integrate X402 with ease, easier adoption. (By contributor of Hono)

Stable402.com — reference site for the x402 agentic payment ecosystem. Built with Astro 6 + Starlight on Cloudflare Pages.

Multi-chain settlement cost router for the x402 payment protocol. Selects the cheapest or fastest blockchain for each AI agent micropayment.

x402 crypto market data API for AI agents — 16 endpoints, pay-per-request with USDC on Base Mainnet, self-hosted facilitator

Security middleware for x402 agentic payments — PII redaction, spending policy, and replay detection before blockchain commit

x402 payment middleware for Cloudflare Workers — POC 1 of the Stable402 reference implementation series

Agent-to-agent API marketplace on Stellar. One AI sells. Another AI pays. x402 payments, MCP discovery, Soroban on-chain registry.

The payment protocol for people and agents. One MCP server, any payment rail.