Bitcoin slides as Polymarket Clarity Act odds drop to 19%
Bitcoin reversed Monday's advance on Tuesday, September 15, as Polymarket traders pushed the Clarity Act passage probability down to a low of 19%. The cryptocurrency had rallied to $79,427 on Monday. It fell to $76,862, down 1.7%, according to Cryptonews.net, tracking the decline in legislative odds. The odds dropped from 31% earlier, per MarketWatch, as Democrats and Republicans remain divided on digital-asset legislation. The vote is pending.
The Clarity Act contract has become a live macro signal that spot crypto traders are tracking in real time. Anyone who bought Bitcoin on Monday's legislative optimism is now underwater and must decide whether to hold through the vote or cut exposure. The 19% pricing leaves little room for further downside in the contract itself, so the next Bitcoin leg depends on whether the Senate surprise or confirms that pessimism. For Polymarket, the linkage between its political contracts and asset prices is a new kind of systemic attention that it did not have a year ago.
The platform's settlement of this contract will be scrutinized by traders who treated the odds as actionable. Kalshi's parallel contract, which spiked to 64% before retreating, shows the same event can produce wildly different signals across venues. That divergence creates arbitrage temptation that may fail on differing settlement criteria, leaving traders exposed if they assumed the two markets agreed on what passage means. The venue that settles closest to actual outcome gains authority for future legislative markets.
The Clarity Act contract joins a packed week of macro-relevant prediction-market pricing, with Polymarket and Kalshi also diverging sharply on Fed hike odds and Bitcoin month-end targets as traders treat the venues as real-time sentiment gauges.