Introducing Spark: The Lightning-Fast, Zero-Fee Way to Build Financial Apps on Bitcoin

Today, we’re launching Spark.

This started as a small experiment inside the Lightspark offices. It very quickly became the thing we couldn’t stop thinking about. After years of building on Bitcoin and Lightning, trying everything and running into walls — Spark felt like a breakthrough. Once we had our first internal MVP, we knew there was no turning back.

Now it’s real.

Spark is the fastest, cheapest, and most UX-friendly way to build financial apps and issue assets on Bitcoin.

It’s the high-speed settlement stack for Bitcoin — a trust-minimized payment protocol that lets you move Bitcoin and native assets (like stablecoins) instantly and at near-zero cost. All purely natively on Bitcoin, with no bridges or wrapped assets.

Built for developers

Spark is lightweight, efficient, and designed for developers who want to move fast without compromising Bitcoin’s core strengths.

We’ve spent the last few months working with partners to design the best developer experience we could think of. Today, we’re shipping two SDKs that hide all the complexity — so you can do what you do best – just build.

With Spark, developers can:

Easily integrate Bitcoin into any app or service.

Issue new assets (like stablecoins or tokens) on Bitcoin.

Settle transactions instantly and cheaply.

Contribute to a trustless, open financial system.

It’s early

This is a beta. Things will break. Some parts will feel rough. You’ll hit limits we already know about — and probably some we don’t.

We’re not here to overpromise or pretend Spark is finished. It’s not. But it’s real enough, fast enough, and powerful enough that we think it’s worth your time to start building.

We’ll be moving fast, listening hard, and shipping relentlessly. So please keep us honest — your feedback will help us make Spark better.

Start building today

If you’re interested in building a wallet, a payment app, moving money on Bitcoin, or working anywhere at the intersection of money and tech — the best way to get a feel for Spark is to dive into the docs → https://docs.spark.info/

If you have any questions or feedback, tag us on X or reach out directly through the site. We’re moving fast — and we’d love to hear what you’re thinking and building.