PERPLEX

MechanicsWhat this venue actually does

Four jobs, and only two of them are ours.

Most perpetual front ends built on somebody else's venue quietly become a fifth party in the trade: they hold the key, they hold the balance, they batch the orders, and the moment they go down your position goes with them. This one is arranged so that cannot happen, and the arrangement is worth spelling out because it is the whole product.

The quote is the book, not a model of the book

A quote is produced by consuming the venue's resting orders in price order until the size is filled, and reporting what that costs. That is a different thing from taking a mid price and adding an estimate: on a book with a wide top level the two answers differ by more than the fee. Everything that follows from the fill is derived from it rather than from the mark, including the liquidation price on the ticket, which is why that number moves when the book thins even though the mark has not moved at all.

When the visible ladder cannot fill the size, the ticket refuses and says so. Extrapolating past the last resting order produces a number that reads like a price and is not one, and the trader finds out which it was after they have already signed.

Markets are classified by what the venue says they are

The list here is not a hardcoded list of tickers. Every market comes from the venue's own book listing, and each one is sorted by its own metadata: the base interest rate the venue charges it, the margin ceiling it enforces, and whether it carries a funding premium at all. A book with an equity funding profile is an equity, a book at the crypto rate with a low margin ceiling is a meme, and a book the venue prices privately is labelled as such rather than dressed up. New listings appear on their own, because nothing in the classification needs a human to have heard of the ticker.

Leverage is read the same way. The slider stops where the venue's own initial margin requirement stops, because a slider that offers more than the venue accepts is an interface that lies to you and then blames the transaction.

Two signatures, and they do different jobs

Lighter will not accept an order signed with an Ethereum key. It wants a signature over its own curve, from a key registered to your account, so every trader needs one. Yours is derived from a single message your wallet signs: the bytes of that signature are hashed and that hash is the key. Nothing is generated at random and nothing is sent anywhere, so the same wallet on a different machine derives the same key from the same message. Losing this browser loses nothing.

Registering it takes a second signature, over plain text your wallet displays, naming the public key and the account. The first proves the key works, the second proves the account owner asked for it, and neither on its own is enough. After that, orders are signed in the tab by the venue's own signer, compiled to WebAssembly and shipped with this site, and the signed order goes from your browser to the venue without passing through anything of ours.

What that key can do is bounded. It signs orders, and it signs a withdrawal that can only ever pay out to the account's own registered address. It cannot pay a stranger and it cannot change who owns the account. PERPLEX takes a key slot of its own and leaves the one Lighter's own app uses alone, so setting up here does not sign you out of there.

Non custodial, by the shape of the code

There is no deposit address on this site, no custody account, and no key on the server with authority over anyone's collateral. Funding your account is one transaction from your wallet to the venue's own contract on Robinhood Chain, and for a wallet that has never traded on Lighter that same transaction is what opens the account. The approval built for it is for the exact amount of that deposit rather than the unlimited allowance most venues ask for, because an infinite approval is a standing permission over every token that wallet will ever hold, and the convenience it buys is one signature.

The server can be switched off and your position is unaffected. It is not in the path.

A market order still carries a price

Every market order sent from here is bounded, and the bound travels with the order. Sending one without a bound means accepting whatever the book has become between the quote and the fill, which on a thin book at three in the morning is not a theoretical difference. Stops and targets are separate reduce only orders held by the venue: reduce only is what makes it safe to leave one resting, because it can shrink a position and can never open one.

What can still go wrong

Leverage liquidates. On most of these markets a single ordinary hour is enough to take out a position at high multiples, and the liquidation price on the ticket is the venue's own, so it is the real one rather than a flattering one. A book can be thin, and a large order into a thin book pays for it in slippage that the ticket shows before you sign and not after. The venue can halt a market, and equities on it follow the hours and the halts of the thing they track. None of that is hidden here, and none of it is ours to override.

$PLEX is an experimental token on a meme launchpad. It is attached to this technology, it is not a claim on it, and it is not an investment.