Polymarket adds instant Bitcoin deposits through Lightning

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Polymarket adds instant Bitcoin deposits

Highlights

Polymarket now supports instant Bitcoin Lightning deposits.
Deposits can be credited in under one second.
The old Bitcoin flow could take 10 to 60 minutes.
Kalshi recently overtook Polymarket in April taker volume.

The new deposit route is powered by Spark, a protocol built by Lightspark, and replaces the slower on-chain Bitcoin funding flow Polymarket added in October 2025. Under the previous system, deposits required three to six confirmations before funds were credited, often taking 10 to 60 minutes and carrying higher minimums tied to bridging costs, according to Bitcoin.com.

Faster funding for traders

The Lightning upgrade changes the user experience at a basic but important point: getting money onto the platform. Polymarket says deposits can now be credited in under one second with near-zero fees, while minimum deposits remain low.

Spark works by validating a Bitcoin transaction when it is broadcast, checking for double-spend risk, fee adequacy, and replace-by-fee flags before crediting the account. The system is built on statechain technology, which moves Bitcoin ownership off the main chain while keeping custody tied to the user’s own keys.

That design also reduces Polymarket’s operational burden. The platform does not need to manage its own Lightning nodes or confirmation thresholds, because Spark’s software development kit can handle on-chain, Lightning, and stablecoin rails.

Competition pushes infrastructure upgrades

The timing is not accidental. Prediction markets are becoming a more competitive business, and funding speed is now part of the product.

Kalshi posted $5.42 billion in April taker volume, overtaking Polymarket’s $1.99 billion as total monthly sector volume reached $8.6 billion. Polymarket has also expanded beyond standard event contracts by adding perpetual futures trading for U.S. markets.

Bitcoin deposits give Polymarket direct access to one of crypto’s deepest pools of capital. They also remove a conversion step for users who previously had to move into stablecoins before funding accounts.

Speed becomes a market advantage

The change matters because prediction markets depend on fast reactions. Traders often need to fund accounts quickly when political, sports, or financial events move prices in real time.

For Polymarket, Lightning deposits may help reduce friction at a moment when Kalshi is gaining volume. With Kalshi at $5.42 billion in April taker volume and Polymarket at $1.99 billion, small differences in funding speed, fees, and supported assets could affect where active traders send capital next.

We also reported Kalshi sports prediction markets hit by loss in New York injunction bid.

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