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Base URL: https://l402kit.com All responses are application/json. CORS is enabled for all origins.

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Invoices

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Create Invoice

POST /api/invoice Creates a BOLT11 Lightning invoice. Called automatically by ManagedProvider — you rarely need to call this directly. Request body
FieldTypeRequiredDescription
amountSatsnumber✅Amount in satoshis (min 1)
ownerAddressstring—Your Lightning Address. Required for the split to execute.
Response 200 
{
  "paymentRequest": "lnbc10n1p...",
  "paymentHash":    "a1b2c3...",
  "macaroon":       "eyJoYXNoIjoiYTFiMm..."
}
Errors
CodeReason
400Missing or invalid amountSats
429Rate limit exceeded (20 requests/min per IP)
503Lightning provider temporarily unavailable

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Verify Token

POST /api/verify Validates an L402 token server-side without the SDK. Request body 
{ "token": "<macaroon>:<preimage>" }
Response 200 
{ "valid": true }

{ "valid": false, "error": "Token expired" }

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Split & Payments

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Execute Split

POST /api/split Manually trigger a 99.7/0.3% split payment to a Lightning Address. Requires x-split-secret header.
In most cases the split is triggered automatically via the Blink webhook. Use this endpoint only for manual recovery or custom integrations.
Headers
HeaderValue
x-split-secretYour SPLIT_SECRET env variable
Request body 
{
  "amountSats":   1000,
  "ownerAddress": "you@blink.sv"
}
Response 200 
{ "ok": true, "ownerSats": 997 }
Response 200 (skipped — below minimum) 
{ "ok": true, "skipped": true }

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Dashboard & Stats

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Get Stats

GET /api/stats Returns payment analytics. Requires LNURL-auth session token in Authorization header. Response 200 
{
  "totalPayments": 42,
  "totalSats":     8400,
  "shinydappsFee": 25,
  "walletSats":    12345,
  "walletUsdCents": 456789,
  "byOwner": {
    "dev@blink.sv": { "count": 42, "sats": 8400 }
  },
  "byDay": {
    "2026-04-24": { "count": 5, "sats": 1000 }
  },
  "trend": {
    "payments7d": 12,
    "sats7d": 2400
  },
  "recent": [
    {
      "id": "uuid",
      "endpoint": "/api/data",
      "payment_hash": "a1b2...",
      "amount_sats": 100,
      "owner_address": "dev@blink.sv",
      "paid_at": "2026-04-24T10:00:00Z"
    }
  ]
}

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Pro Tier

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Check Pro Access

GET /api/pro-check?address=you@blink.sv Returns whether a Lightning Address has an active Pro subscription. Response 200 
{ "active": true,  "expiresAt": "2026-05-24T10:00:00Z" }
{ "active": false }

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Subscribe to Pro

GET /api/dev-token?address=you@blink.sv Returns a Lightning invoice to purchase a 30-day Pro subscription (~9,000 sats). Response 200 
{
  "priceSats": 9000,
  "invoice":   "lnbc90n1p...",
  "macaroon":  "eyJoYXNoIjoiY..."
}
POST /api/dev-token Activate Pro after paying the invoice. Request body 
{ "macaroon": "...", "preimage": "..." }
Response 200 
{ "access": true, "expiresAt": "2026-05-24T10:00:00Z" }

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Authentication (LNURL-auth)

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Initiate Login

GET /api/lnurl-auth Returns a LNURL-auth challenge for dashboard login. Scan the QR in the dashboard.

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LNURL-pay Endpoint

GET /.well-known/lnurlp/:username Standard LNURL-pay metadata for Lightning Address resolution. Used internally by the split mechanism.

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Demo

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Demo Index

GET /api/demo Returns info about the available demo endpoints.

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BTC Price (paid)

GET /api/demo/btc-price Returns live BTC price. Requires a valid L402 token (1 sat). Returns 402 with invoice + macaroon on first call. Retry with Authorization: L402 <macaroon>:<preimage>.

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Reveal Preimage

GET /api/demo/preimage?hash=<paymentHash> After paying the demo invoice, call this endpoint with the paymentHash to retrieve your preimage and construct the L402 token.

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Webhooks

POST /api/blink-webhook Internal endpoint. Receives signed payment confirmations from Blink (Svix HMAC-SHA256). Triggers the split and logs the payment. Not intended for direct use.

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API Directory

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Register an API

POST /api/register Register your L402-protected API in the public directory. Called automatically by ManagedProvider.fromAddress() when registerDirectory is provided. Idempotent — safe to call on every server start. Request body
FieldTypeRequiredDescription
urlstring✅Public URL of your L402 endpoint
namestring✅Display name
price_satsnumber✅Price per call in satoshis (min 1)
lightning_addressstring✅Your Lightning Address
descriptionstring—Short description
categorystring—data, ai, finance, weather, compute, storage, or other
Response 200 
{ "ok": true, "id": "uuid" }

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List APIs

GET /api/apis.json Returns all registered APIs. Machine-readable — designed for agents to discover paid APIs. Query parameters
ParamDescription
categoryFilter by category (data, ai, finance, weather, compute, storage, other)
Response 200 
{
  "version": "1",
  "count": 3,
  "apis": [
    {
      "url": "https://api.example.com/weather",
      "name": "Weather API",
      "description": "Live weather data, 1 sat per query",
      "price_sats": 1,
      "category": "weather",
      "created_at": "2026-04-26T10:00:00Z"
    }
  ]
}

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Data Privacy

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Delete My Data

POST /api/delete-data Initiates a LNURL-auth challenge. After wallet verification, all payment records associated with the authenticated pubkey are permanently deleted (GDPR right-to-erasure).