Polymarket enables instant Bitcoin deposits in under 1 second via Lightning

Polymarket began accepting instant Bitcoin deposits over the Lightning Network, using Spark infrastructure to credit funds in under 1 second.

"Users can deposit BTC to the platform with more speed and more privacy," Spark said in a post on X, referring to the Bitcoin protocol built for payments and stablecoins.

The move extends a funding push that started in October 2025, when Polymarket switched on standard on-chain Bitcoin deposits. Those deposits required three to six confirmations, a window of 10 to 60 minutes, before a platform credits an account. The on-chain route also carried a higher minimum deposit, reflecting bridging costs. Spark validates a Bitcoin transaction at the moment it broadcasts, checking for double-spend risk, fee adequacy, and replace-by-fee flags, then credits the deposit in under a second — a design it 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. Each wallet ties to the user's own keys, keeping deposits self-custodial.

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 since 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, handing Polymarket a fresh answer to a competitor that has pressed it on volume. Spark counts wallet providers such as Breez, Xverse, and Cake among the teams building on the same rails, and Tether Chief Executive Paolo Ardoino has praised the protocol as a route to programmable Bitcoin over Lightning.

This article is for informational purposes only and does not constitute investment advice.