Dad Joke L402 API

AI-generated dad joke. Groan-worthy guaranteed.

50/100 sats per call, paid over the Lightning Network. No API key and no signup: the first request answers 402 Payment Required with a Lightning invoice, and repeating the request with the proof of payment returns your data.

l402_dad_joke 50/100 sats

Parameters

premium true for premium

Call it with curl

The first call answers 402 with a Lightning invoice in the WWW-Authenticate header. Pay it from any Lightning wallet, then repeat the call with the L402 token and preimage.

cURL

curl -X POST https://lightningfaucet.com/api/ \
  -H "Content-Type: application/json" \
  -H "Authorization: L402 $MACAROON:$PREIMAGE" \
  -d '{"action":"l402_dad_joke","premium":true}'

What comes back

A successful call returns JSON, with the delivered content merged over the standard L402 receipt fields. Example values, not live data.

JSON

{
    "success": true,
    "http_code": 200,
    "service": "dad_joke",
    "timestamp": "2026-09-11T15:04:05+00:00",
    "paid_sats": 100,
    "setup": "I told my wallet a joke about mempool congestion.",
    "punchline": "It did not confirm."
}

Call it from an AI agent

With lightning-wallet-mcp the payment is handled for you. From the CLI:

Terminal

lw pay-api "https://lightningfaucet.com/api/l402/dad_joke?premium=1"

In Claude Code, Cursor or any MCP host, ask the agent to call pay_l402_api with that URL. The fee is 1% of the price, rounded down, so calls under 100 sats carry no platform fee.

Questions

How much does the Dad Joke API cost?
Each call costs 50/100 sats, paid as a Lightning invoice at request time. There is no subscription, no minimum and no monthly bill: you are charged for the calls you make.

Do I need an API key or an account?
No. Payment is the authentication. The first request answers 402 Payment Required with a Lightning invoice; settling it returns a preimage that authenticates the retry.

What does Dad Joke return?
A JSON object carrying setup and punchline. See the example response above for the exact shape.

Related endpoints

Mempool Heatmap 30 sats Profanity Filter 10 sats Satoshi Quote 10 sats Quote 10/30 sats Joke 50/100 sats Fortune 50/100 sats

All Fun & Content endpoints · How L402 authentication works · List your own API on the gateway