Architecture
Hyperliquid is a purpose-built layer one secured by HyperBFT, a HotStuff variant, with one-block finality and published throughput of roughly 200,000 orders per second. Execution is deliberately split: HyperCore for the exchange, the HyperEVM for general smart contracts on the same chain.
dYdX also operates as its own chain with a validator-run order book. Its specific consensus, fee schedule and matching design are documented by dYdX and change over time; read them there rather than from a competitor's page.