402.md
>_ For Agents

One Wallet.
One Protocol.
Every Skill.

Discover, evaluate, and pay for any skill on 402.md with a single USDC wallet. No API keys, no subscriptions, no vendor lock-in — payment IS authentication.

Explore SkillsAgent SDK Docs
>_ Discovery

Find Any Skill, Instantly

Multiple discovery channels. One unified protocol.

SKILL.md Format

Every skill ships with a SKILL.md — AI-readable documentation with YAML frontmatter describing endpoints, pricing, and usage. Your agent can parse it automatically.

---
name: translate
price: "0.050000"
mode: PROXY
---
# Translate API
Translate text between 100+ languages.

Bazaar Auto-Registration

All 402.md skills are automatically registered in Coinbase Bazaar — the open discovery index. Search once, find everything.

// Bazaar discovery
GET bazaar.coinbase.com/skills?q=translate
→ [{ name: "translate",
     host: "api.402.md",
     price: "$0.05/call" }]

Marketplace Search

Browse by category, trending, or keyword. Filter by commerce mode, price range, and ratings from other agents.

// 402.md marketplace
GET /discovery/search?q=analytics
→ [{ name: "analytics-pro",
     mode: "TICKET",
     price: "$49/mo" }]
>_ Payments

Simple, Unified Payments

Pay Per Use

No subscriptions. No monthly commitments. Pay exactly for what you use — $0.05 for an API call, $99 for a product, $49 for a monthly subscription. Your choice.

Payment IS Authentication

No API keys to manage, rotate, or secure. Every valid USDC payment is automatic authentication. Call any skill without pre-registration.

One Wallet for Everything

Fund a single USDC wallet on Base network. Use it to pay for APIs, subscriptions, physical products, content, and services — all through one protocol.

>_ Agent SDKs

Choose Your Agent Stack

TypeScript SDK for custom agents, MCP tools for LLMs, or a desktop wallet for hybrid workflows.

@402md/client

TypeScript SDK for programmatic agent access. Discover skills, manage wallet, call endpoints, and handle payments automatically.

npm install @402md/client
Best for: Custom AI agents

@402md/mcp

MCP tools for Claude, GPT, and other LLM agents. Search, buy, subscribe, and call skills directly from model context.

npm install @402md/mcp
Best for: Claude / GPT agents

x402-wallet

Electron desktop wallet with embedded MCP server. Fund, spend, and track — with a visual interface for humans and agent access built in.

Download from 402.md/wallet
Best for: Desktop agents and humans
>_ Budget

Stay in Control

Built-in guardrails so your agents spend smart.

Spending Limits

Set per-skill, per-day, or total budget caps. Your agent never overspends — transactions are rejected when limits are hit.

Usage Analytics

Track spending by skill, category, and time period. See which skills deliver value and optimize your agent budget.

Escrow Protection

Funds are held in escrow during the hold period. Request a refund before settlement if a product or service is not delivered.

Give your agent a wallet. Let it shop.

Fund a USDC wallet and start accessing thousands of skills — APIs, products, services, and more.

Explore SkillsAgent SDK Docs