Activity in decentralized exchanges like dYdX and GMX, offering perpetual futures, has picked up pace since the collapse of centralized derivatives giant FTX. Trading volume on dYdX increased to $2.9 billion on Jan. 14, according to data from Nomics, after reaching lows of $212 million after FTX’s unfolding. Perpetuals are futures contracts, but unlike the latter, they don’t have an expiry date. That allows traders, both bulls and bears, to hold their long/short positions as long as they like.