There are some exchanges that are more decentralised (and older) than Hyperliquid. Hyperliquid, while being the most popular one, is not the only horse in the town.
E.g. GMX on Arbitrum chain is no longer prohibitively expensive.
Ethereum and similar chains run arbitrary computation on-chain. You can make a futures exchange on Ethereum (or Solana, etc). However, the fees for doing so are very large, and confirmation times are very long, like any other on-chain transaction.
> HyperCore includes fully onchain perpetual futures and spot order books. Every order, cancel, trade, and liquidation happens transparently with one-block finality inherited from HyperBFT. HyperCore currently supports 200k orders / second, with throughput constantly improving as the node software is further optimized.
Key part:
> fully onchain perpetual futures and spot order books
> Importantly, HyperCore does not rely on the crutch of off-chain order books. A core design principle is full decentralization with one consistent order of transactions achieved through HyperBFT consensus.
And in fact they did just this when their vaults started bleeding money on an unfavourable position (JellyJelly). They handed out a closed source binary and the validators ran it immediately, closing out the market at an arbitrary price.