Providers

Two modes

Mode	Provider	Fee	Testnet / Sandbox	Setup
Managed ⭐	`ManagedProvider`	0.3% per sat	❌ (use mock in tests)	Lightning address only
Soberano	Blink	0%	❌ mainnet only	Free custodial account
Soberano	LNbits	0%	✅ RegTest / signet	Self-host or public instance
Soberano	OpenNode	0%	✅ `testMode: true`	Free sandbox account
Soberano	Alby Hub	0%	✅ via Hub testnet wallet	Self-custodial cloud node
Soberano	BTCPay	0%	✅ RegTest support	Self-hosted node
Soberano	Custom	0%	✅ whatever you wire up	Any Lightning backend

Managed mode — l402kit.com hosts the Lightning node. You add your Lightning address. We forward 99.7% of every sat to you automatically. Soberano mode — You connect your own Lightning wallet/node. 0% fee, full custody, works with any provider.

ManagedProvider (Recommended)

No Lightning node needed. Add your Lightning address and start earning — l402kit.com handles all invoice creation and payment routing. Fee: 0.3% per sat received. 99.7% lands directly in your Lightning wallet. No monthly fee.

import { l402, ManagedProvider } from 'l402-kit';
import express from 'express';

const app = express();
const lightning = ManagedProvider.fromAddress('you@yourdomain.com');

app.get('/premium', l402({ priceSats: 10, lightning }), (req, res) => {
  res.json({ data: 'Payment confirmed ⚡' });
});

app.listen(3000);
// 0.3% fee · no node setup · works immediately

from l402kit import l402_required, ManagedProvider
from fastapi import FastAPI

app = FastAPI()
lightning = ManagedProvider.from_address("you@yourdomain.com")

@app.get("/premium")
@l402_required(price_sats=10, lightning=lightning)
async def premium():
    return {"data": "Payment confirmed ⚡"}
# 0.3% fee · no Lightning node required

import (
    "fmt"
    "net/http"
    l402kit "github.com/shinydapps/l402-kit/go"
)

func main() {
    provider := l402kit.NewManagedProvider("you@yourdomain.com")
    http.Handle("/premium", l402kit.Middleware(l402kit.Options{
        PriceSats: 10,
        Lightning: provider,
    }, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintln(w, `{"data":"Payment confirmed ⚡"}`)
    })))
    http.ListenAndServe(":8080", nil)
}

use axum::{middleware, routing::get, Router};
use l402kit::{l402_middleware, Options, ManagedProvider};
use std::sync::Arc;

#[tokio::main]
async fn main() {
    let provider = ManagedProvider::new("you@yourdomain.com".into());
    let opts = Arc::new(Options::new(10, provider));
    let app = Router::new()
        .route("/premium", get(|| async { r#"{"data":"Payment confirmed ⚡"}"# }))
        .route_layer(middleware::from_fn_with_state(opts, l402_middleware));
    let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
    axum::serve(listener, app).await.unwrap();
}

How it works:

Your API calls ManagedProvider.fromAddress("you@domain.com")
When a caller hits your endpoint, l402kit.com creates a Lightning invoice
Caller pays → Lightning settles → 99.7% forwarded to your Lightning address instantly
Your API verifies the cryptographic proof and returns 200 OK

The 0.3% routing fee is the only cost. No monthly fee. No account registration. Any Lightning address works (Blink, Phoenix, Alby, Strike, Wallet of Satoshi, etc.).

Trust & availability

Who runs l402kit.com? ShinyDapps (open source, MIT). The managed infrastructure runs on Cloudflare Workers — globally distributed, no single server to go down. Uptime: Monitored 24/7 at stats.uptimerobot.com/57uOzF17jK. SLA target: 99.9%. What if l402kit.com disappears? Your verification logic is local — SHA256(preimage) == paymentHash runs in your process, zero network calls. Only invoice creation touches l402kit.com. If the managed service goes down, switch to any soberano provider in one line:

// Before (managed)
const lightning = ManagedProvider.fromAddress("you@yourdomain.com");

// After (soberano — 0% fee, full custody)
const lightning = new BlinkProvider(process.env.BLINK_API_KEY!, process.env.BLINK_WALLET_ID!);

No other code changes. Already-paid tokens keep working — verification is purely cryptographic. Can I self-host the managed layer? Yes. The full source is on GitHub under MIT. cloudflare/ contains the managed API worker — deploy it to your own Cloudflare account in 5 minutes.

Blink (Soberano — 0% fee)

Blink is a free custodial Bitcoin Lightning wallet with a GraphQL API. No KYC, no monthly fee, instant setup. Use it to run in soberano mode with 0% fee.

Contingency plan: Blink is a free service — their pricing can change. If Blink adds fees or limits the API, switch to another soberano provider in one line of code (no other changes required, already-paid tokens keep working). Zero lock-in. Good alternatives: LNbits (self-hosted, 0% forever), OpenNode (commercial SLA), Alby Hub (self-custodial), or BTCPay (fully sovereign).

Get started:

Create account at dashboard.blink.sv
Go to API Keys → create a new key
Copy your BTC Wallet ID from the wallet page

import { BlinkProvider } from 'l402-kit';

const blink = new BlinkProvider(
  process.env.BLINK_API_KEY!,    // blink_xxx...
  process.env.BLINK_WALLET_ID!,  // UUID
);

from l402kit.providers.blink import BlinkProvider

blink = BlinkProvider(
    api_key=os.environ["BLINK_API_KEY"],
    wallet_id=os.environ["BLINK_WALLET_ID"],
)

import "github.com/shinydapps/l402-kit/go"

provider := l402kit.NewBlinkProvider(
    os.Getenv("BLINK_API_KEY"),
    os.Getenv("BLINK_WALLET_ID"),
)

Environment variables:

BLINK_API_KEY=blink_xxxxxxxxxxxxxxxxxxxxxxxx
BLINK_WALLET_ID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

LNbits (Soberano — 0% fee)

LNbits is an open-source Lightning wallet server. Self-host it or use a public instance. Get started:

Set up LNbits (self-host or use legend.lnbits.com)
Create a wallet → copy the Invoice/read key

import { LNbitsProvider } from 'l402-kit';

const lnbits = new LNbitsProvider(
  process.env.LNBITS_KEY!,
  process.env.LNBITS_URL ?? 'https://legend.lnbits.com',
);

from l402kit.providers.lnbits import LNbitsProvider

lnbits = LNbitsProvider(
    api_key=os.environ["LNBITS_KEY"],
    base_url=os.environ.get("LNBITS_URL", "https://legend.lnbits.com"),
)

Environment variables:

LNBITS_KEY=your-invoice-read-key
LNBITS_URL=https://your-lnbits-instance.com

OpenNode (Soberano — 0% fee)

OpenNode is a Lightning provider with a free sandbox for testing. Get started:

Create account at app.opennode.com
Go to Integrations → API Keys → create a key

import { OpenNodeProvider } from 'l402-kit';

const opennode = new OpenNodeProvider(
  process.env.OPENNODE_KEY!,
  process.env.NODE_ENV !== 'production', // testMode
);

from l402kit.providers.opennode import OpenNodeProvider

opennode = OpenNodeProvider(
    api_key=os.environ["OPENNODE_KEY"],
    test_mode=os.environ.get("NODE_ENV") != "production",
)

Alby Hub (Soberano — 0% fee)

Alby Hub is a self-custodial Lightning node in the cloud. Your keys, your sats — no custodian. Get started:

Create a Hub at hub.getalby.com (or self-host)
Go to Settings → Access Tokens → create token with invoices:create + invoices:read scopes
Copy your Hub URL and access token

import { AlbyProvider } from 'l402-kit';

const alby = new AlbyProvider(
  process.env.ALBY_ACCESS_TOKEN!,  // Hub → Settings → Access Tokens
  process.env.ALBY_HUB_URL!,       // e.g. "https://your-name.getalby.com"
);

Environment variables:

ALBY_ACCESS_TOKEN=your-alby-access-token
ALBY_HUB_URL=https://your-name.getalby.com

BTCPay Server (Soberano — 0% fee)

BTCPay Server is fully self-sovereign Bitcoin + Lightning. Your node, your keys, zero custody. Compatible with: self-hosted (Umbrel, Start9, VPS) or managed (Voltage, LunaNode). Get started:

BTCPay store → Lightning → Settings
Account → API Keys → generate key with scope btcpay.store.cancreatelightninginvoice
Copy your Store ID from the store URL

import { BTCPayProvider } from 'l402-kit';

const btcpay = new BTCPayProvider(
  process.env.BTCPAY_URL!,       // e.g. "https://btcpay.yourdomain.com"
  process.env.BTCPAY_API_KEY!,   // Account → API Keys
  process.env.BTCPAY_STORE_ID!,  // from store URL
);

Environment variables:

BTCPAY_URL=https://btcpay.yourdomain.com
BTCPAY_API_KEY=your-api-key
BTCPAY_STORE_ID=your-store-id

Custom provider (Soberano — 0% fee)

Implement the LightningProvider interface to use any Lightning backend:

import type { LightningProvider, Invoice } from 'l402-kit';

class MyProvider implements LightningProvider {
  async createInvoice(amountSats: number): Promise<Invoice> {
    // Call your Lightning node API
    const result = await myNode.createInvoice(amountSats);
    const macaroon = Buffer.from(
      JSON.stringify({ hash: result.hash, exp: Date.now() + 3_600_000 })
    ).toString('base64');
    return {
      paymentRequest: result.bolt11,
      paymentHash: result.hash,
      macaroon,
      amountSats,
      expiresAt: Date.now() + 3_600_000,
    };
  }

  async checkPayment(paymentHash: string): Promise<boolean> {
    return myNode.isPaid(paymentHash);
  }
}

from l402kit.types import LightningProvider, Invoice
from datetime import datetime, timedelta
import base64, json

class MyProvider(LightningProvider):
    async def create_invoice(self, amount_sats: int) -> Invoice:
        result = await my_node.create_invoice(amount_sats)
        exp = int((datetime.now() + timedelta(hours=1)).timestamp() * 1000)
        macaroon = base64.b64encode(
            json.dumps({"hash": result.hash, "exp": exp}).encode()
        ).decode()
        return Invoice(
            payment_request=result.bolt11,
            payment_hash=result.hash,
            macaroon=macaroon,
            amount_sats=amount_sats,
            expires_at=exp,
        )

    async def check_payment(self, payment_hash: str) -> bool:
        return await my_node.is_paid(payment_hash)

Getting Started

SDKs

Agent SDK

Agent Integrations

Guides

Reference

Built with l402-kit

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Two modes

ManagedProvider (Recommended)

Trust & availability

Blink (Soberano — 0% fee)

LNbits (Soberano — 0% fee)

OpenNode (Soberano — 0% fee)

Alby Hub (Soberano — 0% fee)

BTCPay Server (Soberano — 0% fee)

Custom provider (Soberano — 0% fee)

​Two modes

​ManagedProvider (Recommended)

​Trust & availability

​Blink (Soberano — 0% fee)

​LNbits (Soberano — 0% fee)

​OpenNode (Soberano — 0% fee)

​Alby Hub (Soberano — 0% fee)

​BTCPay Server (Soberano — 0% fee)

​Custom provider (Soberano — 0% fee)

Two modes

ManagedProvider (Recommended)

Trust & availability

Blink (Soberano — 0% fee)

LNbits (Soberano — 0% fee)

OpenNode (Soberano — 0% fee)

Alby Hub (Soberano — 0% fee)

BTCPay Server (Soberano — 0% fee)

Custom provider (Soberano — 0% fee)