Polymarket Switches on Instant Bitcoin Lightning Deposits, Cutting 60-Minute Waits to Under a Second
Polymarket, the world’s largest prediction market, has enabled instant bitcoin deposits over the Lightning Network, with new rails powered by the Spark protocol crediting funds in under one second. Key. . .
Polymarket, the world’s largest prediction market, has enabled instant bitcoin deposits over the Lightning Network, with new rails powered by the Spark protocol crediting funds in under one second. Key TakeawaysPolymarket now credits bitcoin Lightning deposits in under 1 second via Spark, versus 10–60 minutes onchain. Spark validates BTC transfers at broadcast, replacing the 3–6 confirmations Polymarket required since October 2025. Kalshi’s $5. 42 billion April volume lead over Polymarket raises the stakes for faster funding rails in 2026. Opening up New AvenuesPolymarket has switched on instantbitcoindeposits via theLightning Network, a payments layer built on top of theBitcoinnetwork (powered by the Spark protocol). The upgrade replaces a funding flow that previously took anywhere from 10 to 60 minutes, with the new route crediting deposits in under a second with near-zero fees. The change is a sharp departure from the standard onchainbitcoindeposits Polymarket added in October 2025, which required three to six network confirmations before the platform credited an account. They carried a higher minimum deposit that reflected bridging costs, but the Lightning route changes that status quo, settling transactions in seconds while keeping minimums low. Tether CEO Paolo Ardoino, whose company issues theUSDTstablecoin, praised the underlying technology, describing it as:“A route to programmableBitcoinover Lightning. ”How Spark’s Zero-Conf Rails WorkSpark was developed by Lightspark and is built on statechain technology, a design that movesbitcoinownership off the main chain while preserving user custody. The protocol validates abitcointransaction at the moment it is broadcast, checking for double-spend risk, fee adequacy, and replace-by-fee flags before crediting the deposit. The structure also lightens Polymarket’s operational load as the platform does not have to manage confirmation thresholds or run its own Lightningnodes, because a single Spark software development kit (SDK) handles onchain, Lightning, andstablecoinrails. Deposits remain self-custodial, with each wallet tied to the user’s own keys, so traders retain control of their funds until they place a trade. As things stand, wallet providers including Breez, Xverse, and Cake are building on the protocol, indicative of the fact that instantbitcoinsettlement could become a standard feature across consumercryptoapps rather than a niche add-on. A Funding Arms Race With KalshiThe upgrade lands in the middle of an intensifying battle forprediction marketvolumeas rival exchange Kalshi posted$5. 42 billion in April taker volume, overtaking Polymarket’s $1. 99 billion for the first time as the sector’s monthly total hit $8. 6 billion. The latter also recently unveiledperpetual futures tradingfor U. S. markets, broadening its offering beyond simple event contracts as it works to reclaim ground from its regulated rival. Bitcoindeposits give Polymarket access to the deepest pool of capital incryptoand by meetingbitcoinholders where they are, the platform is removing a conversion step that previously pushed some would-be depositors towardstablecoinfunding instead. With Kalshi setting monthly records and both platforms courting the same pool of traders, deposit speed, fees, and asset coverage are likely to decide where the next wave ofprediction marketcapital lands.