fomo Perps: How They Actually Work (Hint: fomo Doesn't Run Them)
Table of Contents
If you open fomo's perpetual futures tab expecting fomo to be the exchange on the other side of your trade, it isn't. Here's what's actually happening when you place a perps order on fomo, and why it matters for what you're paying.
fomo's perps are Hyperliquid trades, placed through a mechanism called a builder code. fomo adds roughly 0.05% on top of Hyperliquid's own fee — about double the cost of trading Hyperliquid directly. The tradeoff is convenience: Hyperliquid currently has no proper native mobile app, and fomo does.
What's actually happening when you trade perps on fomo
hyperliquid fomo's own terms of service are direct about this:
"Perps accessible through the Services are offered, operated, matched, and settled entirely by independent, third-party decentralized protocols."
In practice, that third party is primarily Hyperliquid, one of the largest decentralized perpetual futures exchanges. fomo isn't the counterparty to your trade, doesn't custody your position, and doesn't set the core mechanics of how the market works — Hyperliquid does all of that. fomo is a front-end: the app you're tapping in, wired up to Hyperliquid's actual exchange underneath.
Source: fomo -- official product image. fomo hasn't published a screenshot of its perps order screen specifically; this shows the same buy-panel-and-fee layout its spot trading uses.
How fomo still gets paid: builder codes
Hyperliquid has an official mechanism called a builder code that lets other apps add their own small fee on top of a trade placed through their interface — the reward for building the front-end you're actually using, and for handling everything Hyperliquid itself doesn't (the mobile app, the social feed, the Apple Pay funding). You approve the fee once, and Hyperliquid's own systems still settle and secure the trade itself.
Per fomo's help center, the fee structure is:
| Component | Fee |
|---|---|
| fomo's builder fee | 0.05%, charged on both opening and closing a position |
| Hyperliquid's own fee | ~0.045% for a typical taker order |
| All-in cost per side | ~0.095% |
That's roughly double what you'd pay placing the identical trade directly on Hyperliquid.
fomo isn't uniquely expensive here
0.05% is the standard builder fee across mobile apps that route to Hyperliquid this way -- 
Phantom charges the exact same rate. Some apps charge more (
MetaMask charges the maximum allowed, 0.1%) and some charge less (
Axiom charges 0.01%). fomo sits in the middle of the pack, not at the expensive end.
Why you'd use fomo instead of just going to Hyperliquid
The honest answer is convenience, not price. Hyperliquid currently has no full native mobile trading app — its official Android release is an early, notifications-only version, and there's no official iOS app at all. Trading Hyperliquid directly from a phone means using its mobile website. fomo bundles Hyperliquid's order book into a proper native app, alongside the social feed, Apple Pay funding, and spot trading — for a real fee premium.
Whether that trade-off is worth it depends on how you actually trade. If you're placing large, infrequent perps positions, the 0.05% builder fee adds up and going direct to Hyperliquid (accepting the rougher mobile experience) saves real money. If you're trading smaller amounts and value having spot and perps and the feed in one app, the premium is arguably what you're paying for.
What perps are not available for
Not available to U.S. Persons
fomo's terms of service state plainly that "Perps functionality is not available to U.S. Persons... and may be restricted in additional jurisdictions at our sole discretion." This isn't a fomo-specific restriction — Hyperliquid itself restricts US access — but it means US-based traders will only see fomo's spot trading, not perps.
Understand the fee before you trade
See exactly what a fomo perps trade costs, worked out against Hyperliquid's own rate.
Get the fomo appRelated reading
- fomo Fees Explained — the full fee schedule, spot and perps
- What Is fomo? — the full picture of the app
- Our sister site HyperliquidGuide — for trading Hyperliquid directly
Frequently Asked Questions
No. fomo's own terms of service state that perps are offered, operated, matched, and settled entirely by independent, third-party decentralized protocols — primarily Hyperliquid. fomo is a front-end that routes your order there and adds its own fee.
A mechanism Hyperliquid provides that lets other apps, like fomo, add a small fee on top of trades placed through their interface, in exchange for building the front-end you're actually using. You approve the fee once; Hyperliquid still settles and custodies the trade.
No. fomo's terms explicitly state perps functionality is not available to U.S. Persons, and may be restricted in additional jurisdictions.
Yes, on fees specifically. fomo adds roughly 0.05% per side on top of Hyperliquid's own fee, which works out to about double the cost of trading Hyperliquid direct. What you lose by going direct is Hyperliquid's own mobile experience, which is limited — it currently has no full-featured native trading app.
Disclaimer: This content is for informational purposes only and does not constitute financial advice. Trading memecoins involves substantial risk of loss, and most of them go to zero. Past performance is not indicative of future results. Always do your own research before trading. This site contains referral links: signing up through our referral link earns us a share of the trading fee you pay, at no extra cost to you, and gives you a permanent 10% discount on your own trading fee.
Ready to Start Trading?
Sign up to fomo through our link and your trading fee is permanently 0.45% instead of 0.50%.
Get 10% off fomo fees