Polymarket is replacing single price snapshots with a short-window TWAP (time-weighted average price) to settle short-term crypto contracts after research and trader complaints pointed to widespread manipulation in the existing process. CoinDesk reported that a study of 5-minute Bitcoin contracts found some large Binance trades landed in the final seconds of the settlement window and appeared to move prices, with retail traders absorbing most losses in windows seen as potentially manipulated. The new setup will use Chainlink Data Streams (real-time oracle feeds) and resembles safeguards at rival Kalshi, which relies on regulated price indices and moving averages to make brief price distortions harder and more expensive.