Monetize Your API for AI Agents
402.md lets you earn USDC every time an AI agent calls your API. Just paste your skill spec, set your price — we handle payments and proxy the requests.
How 402.md Works
Register Your Skill
Create a skill on 402.md with your API base URL, add endpoints, and set a USDC price for each one.
POST /developers/me/skills
{ "name": "translate",
"apiBaseUrl": "https://your-api.com",
"mode": "PROXY" }Agent Calls, 402.md Charges
Agent calls your skill via the 402.md proxy. We return a 402 with the USDC price. Agent pays and retries.
POST api.402.md/skills/translate/run
→ 402 { amount: 50000 } // $0.05
PAYMENT-SIGNATURE: <proof>
→ 200 OKYou Get Paid
We verify the payment, proxy the request to your API, and settle USDC to your wallet automatically.
// 402.md proxies to your API your-api.com/run → 200 OK // Settlement → your wallet 95% of $0.05 → 0x1a2b...
Register Your Skill
Create a skill on 402.md with your API base URL, add endpoints, and set a USDC price for each one.
POST /developers/me/skills
{ "name": "translate",
"apiBaseUrl": "https://your-api.com",
"mode": "PROXY" }Agent Calls, 402.md Charges
Agent calls your skill via the 402.md proxy. We return a 402 with the USDC price. Agent pays and retries.
POST api.402.md/skills/translate/run
→ 402 { amount: 50000 } // $0.05
PAYMENT-SIGNATURE: <proof>
→ 200 OKYou Get Paid
We verify the payment, proxy the request to your API, and settle USDC to your wallet automatically.
// 402.md proxies to your API your-api.com/run → 200 OK // Settlement → your wallet 95% of $0.05 → 0x1a2b...
Built for the Agent Economy
Zero API Keys
Payment IS authentication. No key management, no provisioning, no revocation headaches.
Instant USDC Settlements
Choose daily, weekly, or monthly payouts directly to your wallet. No invoicing.
Pay Per Request
No subscriptions or tiers. Agents pay exactly what they use, per API call.
Built on Base
We use Base network — Coinbase L2 with fast confirmations, low fees, and institutional-grade infrastructure.
Open Protocol
Built on x402, an open HTTP standard by Coinbase. No vendor lock-in, no proprietary SDKs required.
AI-Native
SKILL.md documentation format lets AI agents discover and understand your APIs automatically.
Zero API Keys
Payment IS authentication. No key management, no provisioning, no revocation headaches.
Instant USDC Settlements
Choose daily, weekly, or monthly payouts directly to your wallet. No invoicing.
Pay Per Request
No subscriptions or tiers. Agents pay exactly what they use, per API call.
Built on Base
We use Base network — Coinbase L2 with fast confirmations, low fees, and institutional-grade infrastructure.
Open Protocol
Built on x402, an open HTTP standard by Coinbase. No vendor lock-in, no proprietary SDKs required.
AI-Native
SKILL.md documentation format lets AI agents discover and understand your APIs automatically.
Simple Fees, Instant Payouts
┌─────────────────────────────┐ │ │ │ Agent Pays $1.00 │ │ │ └─────────────────────────────┘ │ 5% fee │ ▼ ┌─────────────────────────────┐ │ │ │ 402.md Fee $0.05 │ │ │ └─────────────────────────────┘ │ ▼ ┌─────────────────────────────┐ │ │ │ You Receive $0.95 │ │ │ └─────────────────────────────┘
When?
Daily automatic settlements. Choose daily, weekly, or monthly in your settings.
Minimum?
$10 USDC minimum payout (configurable). Balances roll over until the threshold is met.
Where?
Directly to your wallet on Base network. Just set your wallet address once.
x402 payment verification handled by Coinbase — no extra cost to you
Gas fees (~$0.001) covered by 402.md on settlement
Popular on 402.md
Marketplace launching soon
Built for Both Sides
For Developers
Turn your APIs into revenue streams. Deploy once, get paid on every request.
- Publish any API as a paid skill
- Set per-request USDC pricing
- 5% platform fee — the rest is yours
- Real-time analytics and error tracking
For Agents
Access a growing catalog of paid APIs. Fund your wallet and pay as you go.
- Discover skills via SKILL.md documentation
- Pay per request — no subscriptions
- No API keys to manage
- Fund your wallet on Base network
x402 is an open standard by Coinbase for HTTP-native payments. 402.md is built on these technologies.
Ready to monetize your API?
Join developers already earning with 402.md. Deploy your first paid endpoint in minutes.