If you're trusting an app with your money, you should know how it's protected. That's true for banking apps, brokerage accounts, and it's especially true for crypto, where the security model is fundamentally different from traditional finance.
fomo is a non-custodial crypto trading app, which means you maintain full custody over your own assets. But what does that actually look like in practice? This article breaks down how fomo secures your account, how the underlying wallet architecture works, and what happens behind the scenes when you make a trade.
fomo uses a non-custodial smart wallet architecture where you always control your own private keys. Your account is secured through your email or Apple ID, with FaceID biometric authentication required for sensitive actions like withdrawals and private key exports. Under the hood, your wallet keys are sharded and distributed so that no single party (including fomo) can access your funds.
In crypto, "custody" refers to who controls the private keys that authorize transactions from a wallet. There are two broad models.
With custodial platforms, the company holds your private keys on your behalf. You trust them to keep your assets safe and to process your transactions. If the company gets hacked, goes bankrupt, or freezes your account, your funds are at risk because you don't directly control them. The collapses of several major crypto platforms in recent years underscored how dangerous this model can be for users.
With non-custodial platforms, you hold your own private keys. The app facilitates trading and provides the interface, but it doesn't have the ability to move your funds without your authorization. If the company disappeared tomorrow, you could still access your assets because the keys belong to you.
fomo is non-custodial. Your private keys are tied to your account (secured via your email or Apple ID login), and you remain in complete control of them at all times. You can even export your private keys if you ever want to move to a different wallet.
Key point: fomo cannot access, move, or freeze your funds. Only you can authorize transactions from your wallet.
When you create a fomo account, you sign up using your email address or Apple ID. This is your primary authentication method, and it's what ties your identity to your wallet.
This approach replaces the traditional crypto onboarding flow where you'd need to write down a 12 or 24-word seed phrase and store it somewhere safe. Seed phrases are powerful from a security standpoint, but they're a terrible user experience. People lose them, store them insecurely, or get confused by the concept entirely. By linking your wallet to your existing email or Apple ID, fomo removes that friction while keeping the self-custodial security model intact.
Your login credentials serve as the authentication layer that proves you are the rightful owner of your wallet. The key management system (explained in the next section) handles the cryptographic side of securing your private keys.
On Apple devices, fomo uses FaceID as an additional security layer. Biometric authentication is required for:
This means that even if someone had access to your unlocked phone, they couldn't withdraw your funds or export your keys without passing the biometric check. It's the same security model that Apple Pay and banking apps use for authorizing sensitive financial actions.
This is where things get a bit more technical, but it's worth understanding at a high level because it's what makes the "no seed phrase, but still self-custodial" model possible.
fomo uses an embedded wallet architecture. Instead of requiring you to install a separate wallet app (like MetaMask or Phantom) and connect it, your wallet is created and managed directly inside fomo the moment you sign up. This is what allows you to go from creating an account to making your first trade in under 30 seconds.
Your embedded wallet works across all the blockchains fomo supports: Solana, Base, BNB Chain, and Monad. You don't need separate wallets for each chain. A single wallet, secured by a single set of credentials, works everywhere.
The most important question in any self-custodial system is: where are the private keys, and who can access them?
fomo's wallet infrastructure uses a key sharding approach based on well-established cryptographic techniques. Here's the simplified version of how it works:
The practical result: your private keys are never stored in one place, fomo can't unilaterally access them, and the underlying cryptography is mature and battle-tested.
On EVM-compatible chains (like Base and BNB Chain), fomo uses smart contract wallets that comply with the ERC-4337 account abstraction standard. Without getting too deep into the technical details, smart wallets are programmable wallets that enable features traditional wallets can't offer:
This is what allows fomo to offer a trading experience where you fund your account once (via Apple Pay, debit card, or crypto deposit) and trade on any supported chain instantly.
When you slide to buy a token on fomo, several things happen in rapid succession:
The entire process takes seconds. From your perspective, it feels like tapping a button in any fintech app. But behind the scenes, you're executing a self-custodial, on-chain transaction with your own keys on a decentralized blockchain.
This is worth emphasizing because there's often a perception that ease of use and security are at odds. fomo's architecture is designed to deliver both: the speed and simplicity of a centralized exchange, with the self-custody guarantees of a non-custodial wallet.
fomo's security architecture handles the heavy lifting, but there are practical steps you can take to maximize your account's security:
Keep your email account secure. Your fomo account is tied to your email or Apple ID. Use a strong, unique password for your email and enable two-factor authentication if you haven't already. Your email account is effectively the gateway to your fomo wallet.
Keep FaceID enabled. Biometric authentication is your strongest line of defense against unauthorized access. Don't disable it for convenience.
Be cautious with your private keys. If you export your private keys for any reason, treat them with the same care you'd give a bank password. Don't share them, don't store them in plain text, and don't screenshot them.
Watch out for phishing. fomo will never ask you for your private keys, passwords, or seed phrases via email, DM, or any other channel. If someone claims to be from fomo and asks for this information, it's a scam.
Keep your device updated. iOS security updates patch vulnerabilities that could compromise apps on your device. Stay current.
fomo is fully non-custodial. You maintain complete control over your private keys and funds at all times. fomo cannot access, move, or freeze your assets.
Because fomo is non-custodial, your assets are stored on the blockchain and controlled by your private keys. You can export your keys and access your funds through any compatible wallet, independent of fomo.
No. fomo's wallet architecture secures your private keys through your email or Apple ID login and a key sharding system. You don't need to manage a seed phrase, though you can export your private keys at any time if you want a backup.
FaceID is used to open the app, authorize withdrawals, and authorize private key exports. It ensures that only you can perform sensitive actions on your account, even if someone else has access to your device.
fomo sponsors gas fees for your transactions. You don't need to hold native chain tokens (like ETH or BNB) to trade. The smart wallet architecture handles gas sponsorship automatically.
Your account is tied to your email or Apple ID, so you can access it from any device where you can authenticate. Biometric security settings apply per-device.
fomo currently supports trading on Solana, Base, BNB Chain, and Monad, all from a single unified USD balance.
No. Only your wallet address and transaction data are on-chain. Your personal information (email, identity) is handled off-chain by fomo's authentication system and is not published to any blockchain.
This article is for informational purposes only and does not constitute financial, investment, or security advice. While fomo employs robust security measures, no system is completely immune to risk. Crypto assets are volatile and speculative. Always do your own research and exercise caution when trading digital assets.
