Spark is a Bitcoin-native L2 designed for instant, low-cost payments — including native stablecoins. Spark makes Bitcoin useful again, not just valuable. Developers can build self-custodial wallets and apps that scale, interoperate with Lightning, and settle in any currency or sats.

Sixteen years ago, Bitcoin introduced something radical: a peer-to-peer electronic cash system. At the time, it sounded like science fiction, but today, it’s a trillion-dollar asset. It’s held by institutions, written about in central bank reports, and debated on Senate floors. Everyone knows what Bitcoin is; whether they use it or not, they know it’s real. And that alone makes it one of the most successful pieces of software ever written.

But while Bitcoin has wildly succeeded as a monetary asset—a decentralized store of value that no one can print more of—it hasn’t become the medium of exchange many imagined early on. People do move Bitcoin, but on the scale of global payments, it’s a footnote. Sending it is slow and costly: a basic transfer can take thirty minutes and cost you real money. And that’s not a bug—it’s by design. People have tried to build on it. We’ve seen attempts to scale: bigger blocks, sidechains, second layers. But every solution has come with more complexity.

The most well-known of these attempts is Lightning. It’s arguably the most adopted scaling solution for Bitcoin. It proved you could move Bitcoin fast and cheap without breaking the core promises of trust. But Lightning is limited by design. Alone, it can't scale to billions of people. The clunky UX makes scaling difficult, liquidity is fragmented, and — most importantly — spinning up new wallets is too costly for developers.

While all these efforts to scale Bitcoin were unfolding, something else started to take off: stablecoins. They succeeded not because they were part of the original vision, and not because they were philosophically pure — but because they solved a real problem. What people want is money that doesn’t swing 5% a day — money they can send, store, and build with. They want dollars that settle instantly, anywhere in the world.

For developers, stablecoins became a kind of superpower. With just a few lines of code, you can launch wallets for users in any country. You can build new kinds of apps — marketplaces, tools for savings, creator payouts — without asking permission or touching a bank. Stablecoins turned crypto from a speculative asset into an actual financial rail — something you could use, not just bet on — and demand followed; today, they move more value than PayPal.

The twist? None of the stablecoin activity that crypto enjoys today happens on Bitcoin. For the exact reasons we’ve already covered — Bitcoin wasn’t built for it. It’s not expressive. It doesn’t have smart contracts like other networks.

And yet — this might be the most exciting primitive still left to unlock. Bitcoin isn't just an asset, it's a network. One with unmatched staying power -- over 200 millions users, it makes up more than 60% of all crypto liquidity, and has a brand that transcends the space. On every timeline, people will still be building on Bitcoin; no one can confidently say the same about other networks.

Today, we’re introducing Spark.

Spark is a return to first principles. It’s a way to build on Bitcoin, instead of building around it. An attempt to bring applications back to the mother protocol: Bitcoin.

First, by delivering the best UX ever built on Bitcoin. Whether you're a wallet, a game, or a marketplace — you get the simplest, fastest, and cheapest rails in crypto.

Second, by unlocking new primitives — like stablecoins — directly on Bitcoin. Not through wrappers or bridges, but as native assets you can move instantly, self-custodially, and at scale.

Spark is a Bitcoin-native L2 built for payments and settlement. No bridges. No custodians. Just a lightweight signing protocol that makes digital cash — whether BTC or stablecoin — actually usable.

With Spark, developers can:

• Move BTC and Bitcoin-native assets (e.g. stablecoins) instantly, at near-zero cost
• Build self-custodial wallets & apps that scale
• Interoperate natively with the Lightning Network

What we’re launching in Q2

• Wallet SDK: Build fast, Bitcoin-powered wallets with stablecoin support
• Issuance SDK: Give issuers the rails to mint and manage assets directly on Bitcoin

Learn more

Spark is going live at the end of April. If you’re a wallet developer or stablecoin issuer, reach out to us directly through our contact form.