For API Providers

Monetise your API for the agent economy in 10 minutes. No payment integration to build, no billing system to maintain, no chargebacks to dispute.

Last updated: 2026-04-11

What you need

1. A working API with at least one endpoint
2. An MCP server in front of it (we provide a wrapper template)
3. A USDC wallet on Base
4. A description of what your API does

What we handle

• x402 payment verification (the MCP wrapper handles HTTP 402 responses)
• USDC settlement on-chain (every successful call splits 97/3 automatically)
• Discovery (your tools appear in the MCP manifest agents query)
• Search ranking (boosted by uptime, latency, and request volume)
• Health monitoring (we ping your endpoints every 60 seconds)

Listing flow

1. Sign up at payapi.market/list
2. Provide your name, email, wallet address, and API URL
3. Choose Free or Featured tier (Featured triggers Stripe checkout for the $49/mo subscription)
4. Submit for review (24 hours)
5. Once approved, your API is live and discoverable by every agent on the network

List your API →

Frequently asked questions

How long does the listing review take?

We aim for under 24 hours. We check that your MCP server responds, that the x402 payment loop works end-to-end, and that the description matches what the endpoints actually return.

Do I need to write Solidity or any blockchain code?

No. The x402-MCP wrapper template handles every on-chain interaction. You point it at your existing API, set per-endpoint USD prices, and deploy.

Can I keep my existing API and just add x402 in front of it?

Yes. The wrapper sits in front of your real API as a thin reverse proxy. No changes to your application code.

How do I get paid out from USDC to my bank?

USDC on Base off-ramps via any major exchange (Coinbase, Kraken, Binance). PayAPI Market never holds your funds — payments settle directly to the wallet address you provided at listing time.

What happens if my API goes down?

We ping every endpoint every 60 seconds. Listings with sustained downtime are demoted in search ranking and eventually marked as paused until they recover. You stop earning during downtime, you don't get charged for it.