The recurring payment protocol for the stablecoin economy
Subscribers pay by credit card. Merchants receive instant USDC settlement — or euros in their bank account. No chargebacks. No card expiry. 0.5% fee.
Pilot merchants pay zero protocol fee for 3 months — every payment goes to you in full.
How it works
Subscribers pay with their credit card as usual. The rest happens automatically.
01 —
Subscriber enters their credit card. USDC is purchased automatically and deposited into their self-custodied vault.
02 —
A one-time smart contract permission is set. This is the only action the subscriber ever takes.
03 —
AuthOnce executes payments automatically on schedule. Weekly, monthly, or yearly — the subscriber does nothing.
04 —
Merchant receives USDC instantly, or converts to euros via a licensed partner. Funds arrive in their bank account.
For merchants
No chargebacks. No card expiry failures. Instant global settlement. Three ways to get started.
Get a unique payment URL in under 5 minutes. Share it anywhere. No website or code required. Perfect for creators and newsletters.
Drop a Subscribe button into your existing website. Full payment flow handled in a modal. Fires a callback on success.
Full REST API with HMAC-signed webhooks. Real-time payment notifications to your backend. Built for SaaS platforms and marketplaces.
Smart contract payments are irreversible by design. No more revenue reversals arriving months after settlement.
AuthOnce runs on Base Network — a public blockchain accessible to anyone in the world. Any merchant, any subscriber, anywhere.
Receive USDC directly or convert to euros via a licensed partner. Funds settle to your bank account in 1–2 days.
Pricing
AuthOnce charges 0.5% per successful payment pull. That's it. No monthly fees, no setup costs, no hidden charges.
Transparency
Both core smart contracts are deployed and verified on Base Sepolia testnet. Mainnet launch follows an independent security audit in Q3 2026.
Join as a pilot merchant. Zero protocol fee for your first 3 months — every payment goes to you in full. We ask only for honest feedback and a testimonial.