lnget is Lightning Labs' official CLI for L402 APIs — handles request, payment, and authentication in a single command. Install: go install github.com/lightninglabs/lnget/cmd/lnget@latest

Copy and paste any of these examples:

lnget -X POST https://sats4ai.com/api/l402/generate-image \
  -d '{"prompt":"A cat on the moon"}'

lnget -X POST https://sats4ai.com/api/l402/generate-text \
  -d '{"input":[{"role":"user","content":"Explain Bitcoin"}]}'

lnget -X POST https://sats4ai.com/api/l402/transcribe-audio \
  -d '{"file":"<base64-audio>","type":"transcription"}'

lnget auto-pays the Lightning invoice, caches the token, and returns the result. Subsequent calls to the same endpoint reuse the cached token.

L402 tokens expire after 10 minutes — pay the invoice and submit your request within that window. Media URLs (images, video, audio) expire after 2 hours. Download or display them promptly.

Building autonomous agents? CLW is a Bitcoin wallet built for AI agents — lets them receive, hold, and spend sats programmatically.

These open-source libraries handle L402 payment automatically — your code makes a normal HTTP request, the library detects the 402 challenge, pays the invoice, and retries with proof. No payment logic needed.

import { get } from 'l402-requests';

// That's it. The library pays the Lightning invoice automatically.
const response = await get("https://sats4ai.com/api/l402/generate-text", {
  method: "POST",
  body: JSON.stringify({ input: [{ role: "user", content: "Explain Bitcoin" }] })
});