\ud83d\udd12 API Paywall
Add a Paywall to
Any API Endpoint
Gate your API behind micropayments. Charge AI agents, bots, and developers per-request \u2014 with no subscription forms, no billing dashboard, no waiting.
Why Traditional API Billing Fails
💳
Stripe minimum $0.30
x402 supports $0.001 micropayments
👤
Requires human signup + KYC
Agents pay with wallet — no account
🕐
30-day payout cycles
Instant on-chain settlement
🔑
API keys shared across users
Per-payment proof — no shared keys
Add a Paywall in 3 Steps
1
Install x402 middleware
npm install x402-express
# or: pip install x402-fastapi2
Wrap your route
// Express.js
const { paywall } = require('x402-express');
app.get('/api/data',
paywall({ amount: '0.005', currency: 'USDC', network: 'base', payTo: WALLET }),
(req, res) => res.json(getData())
);3
Deploy \u2014 done. Agents pay automatically
Any x402-compatible client (Coinbase AgentKit, x402-fetch, custom) will automatically discover the payment requirements and handle the USDC transfer. No client-side code changes needed.
Common API Paywall Use Cases
🔍
Search APIs
$0.001–0.01 per query. Replace free tiers with pay-per-use.
🗃️
Data & Enrichment
$0.005–0.05 per record. Perfect for B2B data APIs.
🤖
AI Model APIs
$0.01–1.00 per inference. Charge by compute used.
📸
Media APIs
$0.001 per image/video access. Replace watermarks.
🗺️
Geo/Maps APIs
$0.0001 per geocode. Undercut Google Maps pricing.
🔐
Auth/KYC APIs
$0.10–1.00 per verification. High-value single calls.
Find API Paywall Libraries
mpp.best tracks 982+ payment solutions and x402 middleware for every language and framework.