Perps on fomo: How They Work and Who Actually Runs Them

When you open a perpetual future in the fomo app, fomo is not the exchange, and fomo says so itself. Its Terms of Use state that perps are "offered, operated, matched, and settled entirely by independent, third-party decentralized protocols," and that "Fomo does not operate, control, intermediate, custody, or settle Perps trading." fomo's own launch post, dated June 11, 2026, names the venues behind the feature as Hyperliquid and Trade[XYZ]. What fomo charges for the app around it is documented separately: 0.05% per perps trade, per its help center, taken when you open and again when you close. Hyperliquid publishes its own schedule, with a base taker rate of 0.045%. Add the two and a taker order routed through the app runs about 0.095% per side, against 0.045% placed directly. Every figure here was checked on August 14, 2026, and the source for each one is named next to it.

What fomo's own terms say about who runs perps

hyperliquid The clearest source on this is fomo's Terms of Use, which are unusually blunt for a legal document:

"Perps accessible through the Services are offered, operated, matched, and settled entirely by independent, third-party decentralized protocols. Fomo does not operate, control, intermediate, custody, or settle Perps trading."

Read that carefully, because it rules out most of what people assume a trading app is doing. Not matching. Not settling. Not custodying. Not intermediating. What is left is the part fomo does build: the app, the order screen, the balance view, the feed the position shows up in.

For the venue on the other side, fomo's launch post from June 11, 2026 says the feature is "powered by Hyperliquid and Trade[XYZ]." Two names, not one. The fee numbers below come from fomo's help-center article on perps fees and from Hyperliquid's published schedule, so they describe the Hyperliquid side. We have not found a published rate card for the Trade[XYZ] side, which is where the equity, index and commodity perps appear to sit, so treat the arithmetic here as covering crypto perps and nothing more.

Source: fomo, official product image. fomo has not published a screenshot of its perps order screen specifically, so this shows the same buy-panel-and-fee layout its spot trading uses.

The builder code, and what Hyperliquid documents about it

A builder code is Hyperliquid's own mechanism, and Hyperliquid documents it publicly. Per Hyperliquid's builder-codes docs, an interface can attach an optional fee to the orders it sends, but only after the trader has signed an approval setting the maximum fee that interface may charge. The same page caps what any builder can take: "Builder fees charged can be at most 0.1% on perps and 1% on spot." A trader can have up to ten builders approved at once and can revoke any of them.

That is the mechanism fomo uses. Per fomo's help center, "fomo charges 0.05% per trade on perps," deducted "both when you open a position and when you close it," and the same page says "Hyperliquid fees also apply and are shown on the order screen before you confirm."

Placing the same taker order directly on Hyperliquid means paying the 0.045% and not the 0.05%, so the app roughly doubles the fee on that order. Use limit orders that rest and Hyperliquid's base maker rate of 0.015% applies instead, which makes fomo's 0.05% the larger of the two components rather than the smaller one.

Where the money sits at each stage

This is the part worth understanding before you need it, because the answer changes partway through a trade.

Before you trade. Your balance is in the fomo wallet, the self-custodial one generated at signup. fomo's terms name Privy as the third-party provider involved in the key handling, and state that "the keys will be transmitted to you unencrypted by Privy." Our security guide covers what that does and does not protect you from.

When you open a position. Collateral goes to the venue. fomo's terms say fomo does not custody or settle perps trading, which means the money backing an open position is not sitting with fomo the way your spot balance is. If you want the specifics of how a given venue holds margin and when it liquidates, the venue's own documentation is the source for that, not us and not fomo.

While the position is open. fomo shows you a view of it and takes its documented fee on the way in and on the way out. The order screen displays the venue's fee alongside fomo's before you confirm, per fomo's help center.

When you close. The venue settles, proceeds come back to your balance, and fomo's 0.05% has now been charged twice, once on each leg. That is the arithmetic behind the round-trip cost.

What happens if one side goes down

This follows from the structure above rather than from any outage we have watched, and it is worth thinking through before you need the answer instead of during.

Two independent systems are involved, so either can fail on its own. If fomo's app is unavailable, an open position does not evaporate, because fomo's terms say fomo is not the one holding or settling it. If the venue is unavailable, a working app cannot help, because the thing doing the matching is the thing that is down. A front-end is not a substitute for an exchange.

The honest limit: we have not tested reaching a fomo-opened position through Hyperliquid's own interface during a fomo outage, so we will not tell you it works. What is documented is that fomo wallets are self-custodial with an exportable key, and that fomo does not settle perps. Whether those two facts add up to a usable recovery path in practice is exactly what you want to know before you carry leverage you would mind losing sight of.

Why you would use the app instead of going direct

The honest answer is convenience, not price. Trading through fomo puts spot, perps, the feed and one funding balance in a single phone app, and fomo's fee is what that packaging costs. Going direct to the venue removes the 0.05% and also removes all of that.

Which side of the trade-off you land on depends mostly on size. Large, infrequent positions make 0.05% a real number, and going direct saves real money. Smaller positions, opened because you saw something in the feed, are mostly paying for the app you were already in.

There is also the question of whether you want leverage at all. Plenty of tokens people reach for perps to bet on trade spot in the same app, at the spot fee, with nothing to liquidate. PUMP market data shows what that looks like for one of them, with live pool depth and the fee worked out at real trade sizes.

What fomo's documents say about access

Related reading

• fomo Fees Explained: the full fee schedule, spot and perps
• What Is fomo?: the full picture of the app
• fomo on Robinhood Chain: the other recent addition to the app
• Our sister site HyperliquidGuide: for trading Hyperliquid directly