Lightning Payment API
The fastest way to integrate Lightning Network payments. Full send and receive via API with no nodes, no channels, and sub-second settlement.
Lightning infrastructure is too complex for most teams
Integrating Lightning means running nodes, opening channels, managing inbound liquidity, provisioning capacity, handling routing failures, monitoring uptime, and rebalancing constantly. Most payment platforms can't justify the operational burden. Even Lightning service providers charge high fees, require custodial setups, or impose strict limits. The result is that Lightning adoption stalls at the infrastructure layer: teams want instant bitcoin payments but can't afford the complexity. Spark eliminates the entire stack between your API call and the Lightning Network.
What we do
Lightning payments with one API call
Full Lightning send and receive
No nodes to run, no channels to manage, no liquidity to provision. Call the API, get an invoice, receive a payment. Send to any Lightning address or invoice. Full interoperability with the Lightning Network.
Sub-second settlement
Lightning payments settle instantly. No block confirmations, no routing delays, no payment retries. Funds are spendable the moment the payment completes. Real-time money for real-time applications.
Self-custodial by design
You never touch user funds. Every payment flows directly to the user's self-custodial wallet. No custodial risk on your balance sheet, no trust assumptions, no regulatory overhead from holding customer assets.
Bitcoin and stablecoins in one integration
Lightning payments work with BTC, USDT, and USDB in the same API. Your users can receive bitcoin over Lightning and hold it as stablecoins without leaving the protocol. One integration, instant settlement across all assets.
Why Spark
Lightning Network interoperability without the infrastructure
Initialize the SDK
Install the Spark SDK for your platform (TypeScript for web and Node.js, native bindings for mobile). Configure your API key and you're ready to transact.
Generate Lightning invoices
Request a Lightning invoice for any amount. Your users can pay it from any Lightning wallet. Payments settle instantly, no routing failures, no failed HTLCs.
Send Lightning payments
Send to any Lightning invoice or address. Spark handles routing, liquidity, and capacity. The payment either succeeds instantly or fails fast: no stuck payments, no manual intervention.
Receive webhooks for settlement
Payments trigger webhooks the moment they settle. You get instant confirmation: no polling, no syncing, no waiting for blocks. Update your app state in real time.
Scale without infrastructure
Handle 10 payments or 10 million: Spark manages the Lightning layer. No nodes to scale, no liquidity to provision, no ops burden as your volume grows.
Products
Instant Bitcoin Deposits
Receive on-chain bitcoin in seconds with 0-conf
Self-Custodial Lightning
Full Lightning send and receive, no nodes or channels
Bitcoin Buy and Sell
The cheapest way to buy and sell bitcoin directly to a self-custodial wallet
Bitcoin Rewards
Distribute bitcoin rewards and incentives at scale
Cross-Chain Bitcoin Swaps
The fastest, cheapest way to move bitcoin into stablecoins and other assets
Stablecoin Issuance
Issue and manage stablecoins natively on Bitcoin
Spark is transformative. It redefines what Bitcoin can be, evolving it from a monetary network into an application platform.
FAQ
Payments settle in under a second. Lightning transactions on Spark are final the moment they complete: no block confirmations, no pending states.
Lightning payments within Spark are fee-free. You only pay Bitcoin network fees when depositing to or withdrawing from Spark. No per-transaction markup, no hidden costs.
Yes. Spark is fully interoperable with the broader Lightning Network. Your users can send and receive payments to any Lightning wallet, node, or service. No walled garden: payments route across the entire network.
The Spark SDK supports TypeScript (Node.js, browser, React Native). Breez also offers a Rust SDK with bindings for Swift, Kotlin, Python, Flutter, Go, C#, and WebAssembly.
Spark supports Lightning payments up to the limits of the Lightning Network itself. For larger amounts, you can batch payments or fall back to on-chain bitcoin with instant 0-conf deposits.
Spark eliminates the most common failure modes of Lightning: insufficient inbound liquidity, channel capacity issues, and routing failures. Payments either succeed instantly or fail fast with a clear error. No stuck transactions.
Add Lightning payments to your app
Spark handles the complexity of Lightning so you can focus on building your product. One API for instant bitcoin payments.