Illegal Profits, Legal Liquidations: The Exchange Playbook

I’m writing this mostly as a public-service primer on the most basic tricks in the exchange playbook — so that fewer of you get your money lifted by some fly-by-night casino.

No need to spend much time here. The most common revenue lines:

• –Trading fees — a cut of every buy and sell, usually on a taker-maker model.
• –Fiat on/off-ramp fees — deposits and withdrawals priced well above what the payment rails actually cost the exchange. A nice, steady stream of passive income.
• –The spread — “one-click buy,” “instant convert,” and other easy-mode products don’t show you an order book; they just quote you a price. The spread baked into that quote is far fatter than the fees on the pro trading interface.
• –Listing fees — projects will pay serious money (or tokens) for the liquidity and exposure a listing brings.

There’s more — staking, lending, IEOs — but I won’t belabor it. If you’re genuinely curious, go read Coinbase’s annual report. It’s basically the compliance template.

The definition is simple: deliberately push the price to a specific level for one purpose only — triggering the mass of stop-loss orders traders have pre-placed there. The mechanics:

• –Psychological clustering — retail herds. Stops pile up at predictable levels: just under key support, or at round numbers.
• –Liquidity mapping — the exchange’s prop desk, affiliated whales, or market makers can see exactly where those stops cluster through their systems and the order book. Some exchanges go further and show market makers users' stop and liquidation prices outright.
• –The attack — a massive market sell smashes the price straight through the cluster.
• –The cascade — triggered stops convert into market sells, which adds sell pressure, which dumps the price further, which triggers the next layer of stops. A liquidation waterfall.
• –The harvest — with the price at an artificial low, the manipulator who set it all off starts buying, scooping up the cheap chips coughed up by everyone who was forced out.

To see how an exchange weaponizes its liquidation engine, start with how it defines price. There are three:

The exchange’s public story: mark price exists to “prevent unnecessary liquidations” and “malicious manipulation,” because it anchors to the more stable index price and smooths out the last price’s short-term spasms.

The formula is usually: mark price = index price + the EMA of the basis between the index price and the contract price.

And the exchange runs its wicks precisely by corrupting the formula’s two inputs:

• –Corrupt the index — the exchange unilaterally decides what goes into its “index price.” Slip an affiliated venue (or any thin, shallow-depth one) into the weights, manipulate that little exchange’s spot price, and the index is polluted.
• –Corrupt the basis — the basis is the gap between last price and index price. The whole point of the wick is to violently blow that gap open for an instant. The spasm contaminates the mark-price calculation and drags the mark price toward the last price.

When your margin drops below the maintenance level, your position is handed over to the liquidation engine. The engine tries to close it at a liquidation price better than your bankruptcy price — the price at which your margin hits zero — and the exchange starts liquidating while you still have margin left. If there’s value left over after the close, it does not go back to you. It goes into the exchange’s insurance fund.

In extreme conditions, if the insurance fund can’t cover the losses from positions that blew through bankruptcy, the exchange triggers ADL — auto-deleveraging — force-closing the profitable side of the trade (the counterparties) at the bankruptcy price.

“Every liquidation feeds the insurance fund — and that fund’s growth may flow straight into the exchange’s bottom line.”

During violent moves — exactly when users most need to trade — the servers go down, the API stops responding, logins fail. While the price is crashing you can’t add margin, can’t close, can’t even cancel orders. You just sit there and watch yourself get liquidated.

The defensive motive: in an extreme move, liquidation orders flood the system. If the price falls fast enough, the insurance fund may not cover all the bankruptcy losses — and the shortfall is supposed to be socialized onto the winners via ADL. But do that and your profitable users leave in droves. So the exchange pulls the plug instead: freeze the market and buy the liquidation engine time to chew through the queue. It sacrifices the trapped users to save itself from insolvency.

The offensive motive: at the shadier venues, the exchange itself is every user’s counterparty — client losses are direct exchange profit. There, pulling the plug is an active profit tool: when the market turns against most clients, cut the connection so they can’t stop out, make sure they get liquidated, and maximize the take.

The profit logic here runs three ways:

• –Attract real users — high volume, real or fake, reads as liquidity. It pulls in real investors and high-frequency funds, and those users pay real fees.
• –Justify the listing fees — exchanges charge projects fat listing fees on the promise of volume. Wash trading is how the promise gets “kept.”
• –Volume as a service — market makers sell wash trading to projects directly: it solves the cold-start problem and hits the volume thresholds required to list on bigger exchanges.

Boil it all down and the real money is in perps. The top exchanges all converged on perps; the on-chain DEXs are all perps too. And for a casino that wants to win in this game, there’s only one move left:

“The referee steps onto the field.”

So here’s my sincere advice: don’t trade perps. And if you absolutely must, at least don’t do it at some fly-by-night casino.