🚀 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.

The financial operating system for AI agents. A single HTTP client that intercepts '402 Payment Required', routes across x402, L402, and MPP, persists credentials as recoverable assets, enforces per-envelope budgets, and emits a structured trace.

The MPP registry — 100+ Machine Payments Protocol tools, SDKs, services, and payment methods across 15+ chains. The definitive directory for Stripe + Tempo agent payments.

XMR402 is an open, neutral standard for internet-native payments. It absolves the Internet's original sin by natively making payments possible between clients and servers, creating win-win economies that empower agentic payments at scale. XMR402 exists to build a more free and fair internet.

The gold standard for x402 resources. 459 curated entries, every one checked by hand.

A wallet for your agents to onboard and pay. Agentic MPP / x402 payments from your machine - CLI + MCP server.

Canonical Swift SDK for the Machine Payments Protocol (MPP) — pay for and charge for machine-to-machine API calls over HTTP 402.

Korean resources and tutorials for x402 payment protocol on Base chain

The x402 Service Encyclopedia — Every service ranked, reviewed, and documented. Community knowledge base for the AI agent economy.

Give AI agents a wallet — x402 payment tools over Model Context Protocol.

Turn any API or MCP server into a paid service

One-command local development environment for HTTP 402 Payment Required protocol with blockchain payments (EIP-3009 USDC)

Pay for APIs, unlock content, and settle x402 micropayments right inside VS Code.

FastAPI middleware for Machine Payments Protocol (MPP). Add 402 Payment Required challenges, secure sessions, and receipt validation to your APIs for AI agents.

Base skill for x402 payment protocol — teach any AI agent to pay for HTTP 402 APIs with ERC20/TRC20 tokens. Build your own paid-API skills on top of this.

Live waitlist server — pay to join a queue, receive a signed position token, auto-refund if never served

Scholarly search over arXiv, Crossref, and Semantic Scholar — papers, citation graphs, formatted bibliographies. Paid per query with x402: USDC on Base or Solana.

Framework that turns any website flow into an x402-paid API — declare a flow in YAML, Puppeteer executes, artifact returned in-response

Meta-agent that composes paid skills — dinner + gift + transit in one request, with per-step receipts, powered by the suite

Agents send physical letters and postcards via Lob's test environment — preview PDF returned in-response