Polymarket has introduced instant Bitcoin deposits over the Lightning Network, using payment infrastructure from Spark. The integration allows users to fund their accounts with BTC in seconds, bypassing the typical on-chain confirmation delays that can take 30 minutes or more.
Spark, a Bitcoin Layer 2 payment protocol, handles deposits through a zero-conf model—verifying transactions at broadcast by checking for double-spend risk, fee adequacy, and replace-by-fee signals before crediting the deposit in under a second. This keeps the funding flow self-custodial, with each wallet linked to the user’s own keys, while Spark manages the payment route in the background.
The upgrade builds on Polymarket’s earlier support for standard Bitcoin deposits launched in October 2025, which required several on-chain confirmations. Now, Bitcoin holders can move funds nearly instantly from exchanges and wallets that support Lightning withdrawals—including Cash App, Coinbase, Kraken, Binance, OKX, Wallet of Satoshi, Tether Wallet, and Cake Wallet—without the friction of bridging or converting to stablecoins.
The timing coincides with surging activity in prediction markets. World Cup trading pushed Polymarket-linked contracts past $5 billion, and broader prediction market volume reached $44.8 billion in June. Faster deposits are especially critical for time-sensitive contracts on elections, sports, crypto prices, and macro events, where minutes of delay can mean missed opportunities.
While the feature adds privacy advantages—Lightning deposits leave no direct on-chain footprint—Polymarket remains under regulatory pressure. The CFTC has opened a broad investigation into its operations, South Korea delayed enforcement while giving the platform a chance to respond to gambling-law concerns, and two users have sued over disputed payouts on a Strategy Bitcoin market.
By integrating Spark, Polymarket strengthens its Bitcoin payment rails, signalling that prediction markets are now competing not just on contract design but also on the speed and convenience of funding assets.
