L402 API Registry

A curated directory of APIs powered by Lightning Network micropayments.
No API keys. No subscriptions. Just pay per request.

3 Providers

31 Endpoints

5 Categories

Our APIs

All 25 endpoints →

GET 10 sats

Bid Board - View

View the current board state. Returns all 10 slots ranked by bid amount, plus the current minimum bid price.

https://lightningfaucet.com/api/l402/bid_board

curl curl -s https://lightningfaucet.com/api/l402/bid_board

cli lw pay-api "https://lightningfaucet.com/api/l402/bid_board"

GET 100+ sats (dynamic)

Bid Board - Bid

Place a message on the public bid board. 10 slots available -- outbid the lowest to claim a spot. Dynamic pricing: minimum 100 sats on empty board, must beat lowest bid by 20% to displace.

https://lightningfaucet.com/api/l402/bid_board

curl curl -s https://lightningfaucet.com/api/l402/bid_board

cli lw pay-api "https://lightningfaucet.com/api/l402/bid_board"

GET 50-100 sats

Fortune API

Get a random fortune cookie message. Premium tier (100 sats) for richer fortunes.

https://lightningfaucet.com/api/l402/fortune

curl curl -s https://lightningfaucet.com/api/l402/fortune

cli lw pay-api "https://lightningfaucet.com/api/l402/fortune"

GET 50-100 sats

Joke API

Get a random joke. Premium tier (100 sats) for longer jokes.

https://lightningfaucet.com/api/l402/joke

curl curl -s https://lightningfaucet.com/api/l402/joke

cli lw pay-api "https://lightningfaucet.com/api/l402/joke"

GET 10-30 sats

Quote API

Get an inspirational quote. Premium tier (30 sats) for curated quotes.

https://lightningfaucet.com/api/l402/quote

curl curl -s https://lightningfaucet.com/api/l402/quote

cli lw pay-api "https://lightningfaucet.com/api/l402/quote"

GET 10 sats

Time & Block Info

Get current time and latest Bitcoin block info.

https://lightningfaucet.com/api/l402/time

curl curl -s https://lightningfaucet.com/api/l402/time

cli lw pay-api "https://lightningfaucet.com/api/l402/time"

GET 5-50 sats

UUID Generator

Generate 1-10 UUIDs. 5 sats per UUID.

https://lightningfaucet.com/api/l402/uuid

curl curl -s https://lightningfaucet.com/api/l402/uuid

cli lw pay-api "https://lightningfaucet.com/api/l402/uuid"

GET 5-10 sats

Entropy Generator

Generate cryptographic random bytes (32-256). 5 sats for <=64 bytes, 10 for larger.

https://lightningfaucet.com/api/l402/entropy

curl curl -s https://lightningfaucet.com/api/l402/entropy

cli lw pay-api "https://lightningfaucet.com/api/l402/entropy"

GET 5 sats

HTTP Headers Echo

Echo back your HTTP request headers. Useful for debugging.

https://lightningfaucet.com/api/l402/headers

curl curl -s https://lightningfaucet.com/api/l402/headers

cli lw pay-api "https://lightningfaucet.com/api/l402/headers"

GET 30 sats

Node Info

Get Lightning node information and statistics.

https://lightningfaucet.com/api/l402/node_info

curl curl -s https://lightningfaucet.com/api/l402/node_info

cli lw pay-api "https://lightningfaucet.com/api/l402/node_info"

GET 30 sats

Invoice Decode

Decode a Lightning invoice (BOLT11) and return structured data.

https://lightningfaucet.com/api/l402/invoice_decode

curl curl -s https://lightningfaucet.com/api/l402/invoice_decode

cli lw pay-api "https://lightningfaucet.com/api/l402/invoice_decode"

GET 30 sats

LNURL Metadata

Fetch and decode LNURL metadata from a Lightning address or LNURL.

https://lightningfaucet.com/api/l402/lnurl_metadata

curl curl -s https://lightningfaucet.com/api/l402/lnurl_metadata

cli lw pay-api "https://lightningfaucet.com/api/l402/lnurl_metadata"

GET 50 sats

Onchain Fee Estimate

Get current Bitcoin onchain fee estimates.

https://lightningfaucet.com/api/l402/fee_estimate

curl curl -s https://lightningfaucet.com/api/l402/fee_estimate

cli lw pay-api "https://lightningfaucet.com/api/l402/fee_estimate"

GET 200 sats

Lightning Network Stats

Comprehensive Lightning Network statistics.

https://lightningfaucet.com/api/l402/lightning_stats

curl curl -s https://lightningfaucet.com/api/l402/lightning_stats

cli lw pay-api "https://lightningfaucet.com/api/l402/lightning_stats"

GET 200 sats

BTC Price Oracle

Get current Bitcoin price in multiple currencies.

https://lightningfaucet.com/api/l402/price_oracle

curl curl -s https://lightningfaucet.com/api/l402/price_oracle

cli lw pay-api "https://lightningfaucet.com/api/l402/price_oracle"

GET 30 sats

Mempool Heatmap

Get mempool fee rate distribution heatmap data.

https://lightningfaucet.com/api/l402/mempool_heatmap

curl curl -s https://lightningfaucet.com/api/l402/mempool_heatmap

cli lw pay-api "https://lightningfaucet.com/api/l402/mempool_heatmap"

GET 50 sats

Sentiment Analysis

Analyze sentiment of text. Requires "text" parameter.

https://lightningfaucet.com/api/l402/sentiment

curl curl -s https://lightningfaucet.com/api/l402/sentiment

cli lw pay-api "https://lightningfaucet.com/api/l402/sentiment"

GET 50 sats

Keyword Extraction

Extract keywords from text. Requires "text" parameter.

https://lightningfaucet.com/api/l402/keywords

curl curl -s https://lightningfaucet.com/api/l402/keywords

cli lw pay-api "https://lightningfaucet.com/api/l402/keywords"

GET 100 sats

Summarize/Title

Generate a title or summary for text. Requires "text" parameter.

https://lightningfaucet.com/api/l402/summarize_title

curl curl -s https://lightningfaucet.com/api/l402/summarize_title

cli lw pay-api "https://lightningfaucet.com/api/l402/summarize_title"

GET 10 sats

Profanity Filter

Check text for profanity. Requires "text" parameter.

https://lightningfaucet.com/api/l402/profanity_filter

curl curl -s https://lightningfaucet.com/api/l402/profanity_filter

cli lw pay-api "https://lightningfaucet.com/api/l402/profanity_filter"

GET 500 sats

LLM Prompt

Send a prompt to an LLM and get a response. Requires "prompt" parameter.

https://lightningfaucet.com/api/l402/llm_prompt

curl curl -s https://lightningfaucet.com/api/l402/llm_prompt

cli lw pay-api "https://lightningfaucet.com/api/l402/llm_prompt"

GET 50-100 sats

Dad Joke

Get a dad joke. Premium tier (100 sats) available.

https://lightningfaucet.com/api/l402/dad_joke

curl curl -s https://lightningfaucet.com/api/l402/dad_joke

cli lw pay-api "https://lightningfaucet.com/api/l402/dad_joke"

GET 10 sats

Satoshi Quote

Get a quote from Satoshi Nakamoto, optionally filtered by topic.

https://lightningfaucet.com/api/l402/satoshi_quote

curl curl -s https://lightningfaucet.com/api/l402/satoshi_quote

cli lw pay-api "https://lightningfaucet.com/api/l402/satoshi_quote"

GET 50 sats

Random Sats

Pay 50 sats, reveal a random amount. Entertainment/gambling.

https://lightningfaucet.com/api/l402/random_sats

curl curl -s https://lightningfaucet.com/api/l402/random_sats

cli lw pay-api "https://lightningfaucet.com/api/l402/random_sats"

GET 5-50 sats

Memory Bank

Key-value storage for agents. Store (10 sats/KB), retrieve (5 sats), query (50 sats), list (10 sats).

https://lightningfaucet.com/api/l402/memory

curl curl -s https://lightningfaucet.com/api/l402/memory

cli lw pay-api "https://lightningfaucet.com/api/l402/memory"

These are a few of our 25 L402 endpoints — Bitcoin data, AI utilities, content generation, and more.

Browse Full Catalog AI Agent Docs MCP + CLI

Community Directory

L402 Protocol

Finance 1 endpoint

GET Stock Ticker ~100 sats/credit

https://stock.l402.org/ticker/{SYMBOL}

Real-time stock data (price, P/E, revenue)

Auth: Bearer {user_id} from /signup

Requires pre-registration. Not a pure L402 flow.

Maximum Sats

AI / ML Data 5 endpoints

Maximum Sats DVM

POST AI Text Generation (DVM) 21 sats

https://maximumsats.com/api/dvm

AI text generation endpoint (Llama 3.3 70B). Accepts JSON body {"prompt":"..."}. First query per IP/day is free; paid access via Lightning L402 and x402.

Auth: L402 (pay-per-request, no API key). x402 also supported.

Maximum Sats AI Image Generator

POST Image Generation 100

https://maximumsats.com/api/imagegen

AI image generation powered by FLUX.1 Schnell (12B). Send a text prompt, pay 100 sats via Lightning, get a PNG image. No API keys required.

Auth: L402 (none required - pay per request)

Nostr Web of Trust Scoring API

GET Trust Score 1 sat (/score) after 50 free/day per IP

https://wot.klabo.world/score?pubkey={hex}

Nostr trust scoring API backed by a 51k+ pubkey graph. Query /score for a 0-100 trust score and use /pricing for the full endpoint matrix and costs.

Auth: L402 (pay-per-request, no API key)

Maximum Sats Nostr Summary

POST Maximum Sats Nostr Summary 50 sats

https://maximumsats.com/api/nostr-summary

Summarize Nostr events into concise structured insights.

Maximum Sats Lightning Analysis

POST Lightning Network Analysis 1000 sats

https://maximumsats.com/api/ln-analysis

Lightning Network analysis endpoint. Submit queries for detailed Lightning network data and analytics.

Auth: L402 (pay-per-request, no API key)

List Your L402 API

Have an L402-enabled API? Get discovered by AI agents and developers worldwide.

1,000 sats listing fee Reviewed within 24h

Submit Your API

What is L402?

L402 (formerly LSAT) is a protocol that enables APIs to charge per-request using Bitcoin's Lightning Network. When you call an L402-protected endpoint:

1 Server returns HTTP 402 Payment Required with a Lightning invoice
2 Client pays the invoice (~milliseconds)
3 Client retries request with proof of payment
4 Server returns the requested data

Our AI Agent Wallet handles this automatically — via MCP pay_l402_api() or CLI lw pay-api <url>.

L402 API Registry

Our APIs

Bid Board - View

Bid Board - Bid

Fortune API

Joke API

Quote API

Time & Block Info

UUID Generator

Entropy Generator

HTTP Headers Echo

Node Info

Invoice Decode

LNURL Metadata

Onchain Fee Estimate

Lightning Network Stats

BTC Price Oracle

Mempool Heatmap

Sentiment Analysis

Keyword Extraction

Summarize/Title

Profanity Filter

LLM Prompt

Dad Joke

Satoshi Quote

Random Sats

Memory Bank

Community Directory

L402 Protocol

Maximum Sats

Maximum Sats DVM

Maximum Sats AI Image Generator

Nostr Web of Trust Scoring API

Maximum Sats Nostr Summary

Maximum Sats Lightning Analysis

List Your L402 API

What is L402?

L402 Resources

API Catalog

L402 Documentation

Awesome L402

Aperture