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Pay-per-use APIs powered by Lightning Network. Perfect for testing AI agent payments or building micropayment-powered applications.
L402 (formerly LSAT) is an HTTP-native payment protocol. Request a resource, pay a Lightning invoice, and get instant access. No API keys needed — just pay and access.
Three L402-protected APIs with standard and premium tiers. Pay only for what you use.
/api/l402/fortune
AI-generated Bitcoin-themed fortunes and prophecies. Premium includes lucky numbers and extended readings.
/api/l402/joke
Tech, Bitcoin, and dad jokes. Premium tier includes AI-generated variations and explanations.
/api/l402/quote
Inspirational quotes from tech leaders, philosophers, and Bitcoin pioneers with context.
curl https://lightningfaucet.com/api/l402/fortune?category=bitcoin
{
"error": "payment_required",
"price_sats": 10,
"tier": "standard",
"invoice": "lnbc100n1pj...",
"macaroon": "AgELbGln...",
"payment_url": "https://lightningfaucet.com/pay/aBcDeFgH"
}
# After paying and receiving preimage...
curl -H "Authorization: L402 <macaroon>:<preimage>" \
https://lightningfaucet.com/api/l402/fortune
Select an endpoint and pay with Lightning. Pay per request — no API keys needed.
Use our Agent Wallet API to fund your agents and let them pay L402 APIs automatically.