Perp DEXs: Uncovering the Three Architectures Behind Cryptocurrency Futures

The concept of a perpetual decentralized exchange (perp DEX) has been explained in many guides, but few delve into its three distinct architectures. A perp DEX allows traders to take leveraged long or short positions on assets without owning them, using contracts with no expiry date and settled by smart contracts from a self-custodial wallet.

The key mechanism that keeps perpetual futures prices near spot prices is the funding rate, a periodic payment between longs and shorts. When a contract trades above spot, longs pay shorts, making the crowded side expensive to hold and pulling the price back. When it trades below, the flow reverses.

There are three different architectures: on-chain order books matching traders against each other, pooled-liquidity venues where depositors take the other side against an oracle price, and hybrids that separate matching from settlement. The counterparty in a perp DEX trade depends entirely on which architecture is used, and understanding this is crucial for navigating stress events.

The risk chain shared by all three architectures includes margin to liquidation to backstop to auto-deleveraging. Knowing where a venue sits in this chain is more important than any yield or fee comparison.