Polymarket, the crypto-native prediction market, has begun supporting instant Bitcoin deposits over the Lightning Network. The feature uses infrastructure from Spark, a Bitcoin protocol built for payments and stablecoins.
In a post on X, Spark told users they can deposit BTC to the platform with more speed and more privacy than the older method offered.
The move extends a funding push that started in October 2025, when Polymarket switched on standard on-chain Bitcoin deposits. Those deposits carried a wait: most on-chain Bitcoin transactions need three to six confirmations, a window of 10 to 60 minutes, before a platform credits an account.
The on-chain route carried a higher minimum deposit, a reflection of bridging costs. For a trader who wants a position on a live market, both the delay and the fee are a cost.
Lightning and Spark close the gap. Spark validates a Bitcoin transaction at the moment it broadcasts, checking for double-spend risk, fee adequacy, and replace-by-fee flags.
The protocol credits the deposit in under a second and absorbs the confirmation risk, a design Spark markets as zero-conf.
Polymarket does not have to manage confirmation thresholds or run its own Lightning nodes; a single Spark SDK handles on-chain, Lightning, and stablecoin rails.
Spark keeps deposits self-custodial. Each wallet ties to the user’s own keys, so the protocol, not Polymarket, carries the operational load, and users retain control of funds until a trade.
Spark counts wallet providers such as Breez, Xverse, and Cake among the teams building on the same rails, and Tether chief Paolo Ardoino has praised the protocol as a route to programmable Bitcoin over Lightning.
Polymarket’s boom over the years
Timing matters for a company in a growth phase.
Founded in 2020, Polymarket rose to prominence during the 2024 U.S. presidential election and has added Chainlink oracles, earnings markets, and a fresh contest with regulated rival Kalshi.
Faster, cheaper funding lowers the barrier for the Bitcoin holders who make up a large share of the crypto audience, and it hands Polymarket a fresh answer to a rival that has pressed it on volume.
