Polymarket Adds Spark for Instant Bitcoin Lightning Deposits | BanklessTimes

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Polymarket is making it much faster to move Bitcoin into prediction markets by turning on Lightning Network deposits powered by Spark. The platform now lets users fund their accounts with self-custodial BTC almost instantly, instead of waiting for on-chain confirmations.

Users can now select a "Bitcoin via Lightning" option within the deposit flow, according to announcements from Spark and Polymarket. If they do, Spark creates a Lightning invoice, the user pays it from any compatible wallet, and the system credits the funds in under a second. Until this, BTC deposits had to go via regular network confirmations, which may take 10 to 60 minutes depending on fees and congestion.

Spark calls its model "zero-conf" because it validates the Bitcoin transaction as soon as it is broadcast, rather than waiting for a block. Before approving a deposit, the protocol checks for double-spend risks, fee levels, and replace-by-fee signals. Then it takes the confirmation risk itself, so Polymarket may report a funded balance nearly immediately.

Self-Custodial Design and Supported Wallets

At the same time, Polymarket keeps the setup self-custodial, which is important to many crypto-native traders. Each user's wallet still links to their keys on the platform's side, while Spark only handles the Lightning payment route in the background. That design means users do not have to park coins on a centralized exchange just to bet on events.

Spark also said the feature is compatible with a long list of popular apps that already enable Lightning withdrawals. These include, but are not limited to, Cash App, Coinbase, Kraken, Binance, OKX, Wallet of Satoshi, Tether Wallet, and Cake Wallet. So now many Bitcoin users can jump directly from their normal wallet into Polymarket with just a tiny Lightning payment.

Since Polymarket already converts deposits into its pUSD collateral on Polygon, the new BTC path is primarily about speed and convenience rather than trading mechanics. Now, Bitcoin traders who like to hold Bitcoin can use it as their funding asset without worrying about large delays each time they move money. In fact, this can make it easier to react to fast-moving news as users can deposit and place trades within seconds.

As Lightning continues to grow, more platforms are experimenting with instant BTC flows into DeFi and betting apps. Polymarket's move suggests that prediction markets want to tap into that liquidity while keeping users in control of their coins.