Now Live on Stacks Mainnet
Give a credit card
to your agent
Enable AI agents to pay for API access with Bitcoin micropayments.
Monetize your endpoints with x402 middleware.
server.ts
import { x402PaymentRequired } from 'x402-stacks';
app.get(
'/api/premium-data',
x402PaymentRequired({
amount: 1000, // microSTX
recipient: 'SP2...',
}),
(req, res) => {
res.json({ data: 'Premium content' });
}
);Built for the Machine Economy
The infrastructure layer for autonomous agent transactions.
Micropayments
Accept payments as low as 0.000001 STX. Perfect for LLM token streaming.
Sybil Resistance
Prevent spam and abuse by requiring a small proof-of-work payment.
Drop-in SDK
Integrate with Express, Fastify, or Next.js in minutes.
Dynamic Pricing
Adjust costs based on server load or user tiers automatically.
Agent Native
Standardized 402 Payment Required headers that agents understand.
Non-Custodial
Payments go directly to your wallet. We never touch your funds.