Polymarket adds Bitcoin Lightning deposits through Spark
Polymarket added instant Bitcoin deposits through the Lightning Network on July 7, 2026. The integration uses Spark to credit deposits in under a second. Users fund accounts with Bitcoin directly without custodial intermediaries, then trade in USD-denominated balances. Spark provides the Lightning infrastructure while Polymarket handles conversion. The feature offers faster, cheaper transfers than on-chain Bitcoin. Spark announced the partnership alongside the launch.
Lightning deposits remove a core frictions for Bitcoin holders who previously faced slow on-chain transfers or forced conversion through custodial rails. Polymarket, that opens a funding path distinct from Kalshi's conventional banking stack and targets crypto-native users who already hold Bitcoin self-custodially. Spark's sub-second settlement lets traders move capital onto the platform faster than competitors relying on ACH or Ethereum finality, which matters in volatile markets where deposit delays mean missed entries.
The privacy edge of Lightning routing also matters to users who prefer not to leave bank trails on prediction market activity. Rivals must now match the speed or cede this user segment, and any platform without Lightning infrastructure faces a widening gap in onboarding friction. The catch: Spark handles the rail but Polymarket still converts to USD balances, so the Bitcoin touchpoint is funding-only, not natively traded contracts.