AI models.
Paid in sats.

Try it first

1,000 free sats.
Or pay 1 sat.

Sign in with your email at gateway.loopxxi.com. Your first sign-in creates an API key with 1,000 free sats of credit.

Or skip the account: pay a single request by L402, from 1 sat.

Status

Buying is open.

Both payment rails, prepaid top-up and per-call L402, were paid end to end on production on 2026-10-08 by Loop XXI's own wallet. No external customer yet. Check products.json before paying; if it reports purchasing closed, do not pay.

What you get

Credit for AI requests.

Your payment buys prepaid usage credit and an API key. Use that key in your app or agent to request responses from available AI models.

Gateway suits developers who want AI access funded with Bitcoin Lightning. It is an API for software, rather than a consumer chat app or a custom development service.

What it costs

Pay for the usage.

Top up between 5,000 and 1,000,000 sats per invoice. Credits never expire. There is no subscription. Request costs depend on the selected model and usage; a fixed top-up does not buy a fixed number of responses.

Requests need settled credit and enough balance for the estimated usage. If your balance is too low, add credit before trying again.

Check models and prices ↗

Confirm current prices and payment availability before paying. Credit is for Gateway usage; it is separate from Lightning tips.

Get started

Choose credit.
Pay. Use your key.

1. Choose an amount on the purchase page (minimum 5000 sats).
2. Pay the invoice from your own Lightning wallet.
3. Copy your key, check your settled balance, and connect your app.

No account needed. Keep your key private: it controls access to the purchased credit.

Connect your software

One familiar API.

Use OpenAI-compatible requests with your chosen model and Gateway key. Integration instructions, model discovery and payment checks live in the developer guide.

Questions? business@loopxxi.com