Polymarket Turns On Instant Bitcoin Deposits Via Lightning Network, Powered by Spark
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.
This post Polymarket Turns On Instant Bitcoin Deposits Via Lightning Network, Powered by Spark first appeared on Bitcoin Magazine and is written by Micah Zimmerman.