The Bitcoin Beacon
The largest prediction market wired in instant, self-custodial bitcoin deposits — cleared in under a second by Spark.
Polymarket switched on instant bitcoin deposits over Lightning on Tuesday, built on payments infrastructure from Spark. Deposits that used to wait through on-chain confirmations now clear in under a second — and the wallet keys stay the user’s.
The mechanics matter. Spark runs a “zero-conf” model: when a bitcoin transaction is broadcast, it checks double-spend risk, fee adequacy and replace-by-fee signals, credits the deposit immediately, and carries the confirmation risk itself. Polymarket never runs a Lightning node.
Prediction markets did $44.8 billion in volume in June, and World Cup contracts pushed Polymarket-linked trading past $5 billion. Odds move mid-match; a deposit that lands in ten minutes is a bet you didn’t get to place. The feature works from Cash App, Coinbase, Kraken, Wallet of Satoshi and most other Lightning-enabled apps.
A deposit that lands in ten minutes is a bet you didn’t get to place.
The platform itself remains under scrutiny — a CFTC investigation at home, a gambling-law deadline in South Korea. The rails, though, are indifferent to the referee.
Polymarket added on-chain bitcoin deposits last October; Lightning makes them usable in live markets. Every fast rail bitcoin plugs into makes it a little more like money and a little less like inventory.
Editor’s note: volume figures are the platforms’ and trackers’ own. Zero-conf crediting shifts risk to Spark rather than eliminating it; the model is young. Prediction-market contracts are not available in every jurisdiction.
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