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Is Spark live?

Yes — Spark’s beta mainnet is now live. Developers can start building and transacting on the network. While this is a beta release, core functionality like sending and receiving Bitcoin, supporting tokens (e.g. stablecoins), and Lightning interoperability is fully operational. That said, Spark is still highly experimental — expect bugs, rapid iteration, and breaking changes as we continue to evolve the network.

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What are the fees like?

For Bitcoin payments
Transaction TypeFee structure
L1 to SparkOn-chain fee paid by the user
Spark to SparkFree. Small flat fee coming in 6-12 months
Spark to Lightning0.25% + routing fee
Lightning to Spark0.15%
Coop ExitL1 broadcast fee x 2
Unilateral ExitOn-chain fee paid by the user
Other asset payments (e.g. stablecoins)
Transaction TypeFee structure
L1 to SparkOn-chain fee paid by the user
Spark to SparkFree. Small flat fee coming in 6-12 months
Unilateral ExitOn-chain fee + bond locked by user
Some of the fees are sourced directly from the Lightspark SSP, specifically for Spark–Lightning interactions and cooperative exits back to L1. Lightspark is the first SSP on Spark, but the system is open — anyone can run an SSP (SSP specs coming soon). If you’re an SSP, reach out, and we’ll include your fee structure.

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How many Spark Operators (SOs) are there, and who are they?

At launch, Spark is supported by a small set of two Spark Operators (SOs): Lightspark and Flashnet. We’ve intentionally kept the set small to simplify debugging and testing during the early phase — more operators will be added soon as we scale.

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Should I expect some limits?

Spark is still very early. Please treat everything as a beta environment — things might not always work as expected. With that in mind, limits may be applied. Our first priority is making sure everything stays secure.

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What happens if Spark operators go offline?

This is not live yet — unilateral exit is coming in a few weeks.
You can always exit to Bitcoin L1 using your pre-signed exit transaction. If only a small subset of operators are offline, you can still make transfers using other operators thanks to our threshold signature scheme. If all operators go offline, you won’t be able to make new Spark transfers until operators are back online, but your funds remain in your custody and are redeemable at any time.

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What are the SSPs present?

Lightspark is running the first SSP on Spark. Anyone can become an SSP — we want to maximize the diversity of SSPs to make the network more competitive and redundant.

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Does Spark have a token or a planned airdrop?

Spark does not have a token. Spark has not announced plans for any airdrop or token generation event. Be wary of scams claiming airdrops, giveaways, etc.

If in doubt, refer to official Spark communication channels: Web: https://spark.info Twitter / X: https://x.com/buildonspark

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Does Spark support smart contracts?

No, Spark does not support smart contracts.

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Is Spark open source?

Yes. Spark is open source — you can read the code or contribute directly here.

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Does Spark require KYC / KYB?

No. Spark is an open protocol that provides infrastructure for moving Bitcoin and tokens (e.g. stablecoins). Like Bitcoin, it does not impose any KYC requirements at the protocol level.

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How can I get in touch with the Spark team?

DM us at @buildonspark or reach out directly through our website. We’ll set up a dedicated channel between your team and our engineering and product teams.