As the price of bitcoin hovers well below its all-time high of over $108,000, some bettors on the crypto-based prediction market Polymarket are wagering that the crypto’s price will see a “Santa Claus rally” before the end of year.

A so-called Santa Claus rally is an overall increase in stock prices from the past five trading days in December through the first two trading days in January. It’s a phenomenon that’s happened in the crypto world before, with CoinGecko identifying crypto Santa Claus rallies in 8 of the past 10 years.