The short version. Arbiter has no accounts: no sign-up, no email, no password. Your keys, seed phrase and PIN never leave your device. A few features run on servers we operate, and those keep your wallet address together with what the feature needs — section 1 lists each one and how long it is kept. The app also talks to third parties to work, and your wallet address goes to them.
1. What we collect
There is no sign-up, no email required, no password, and no profile. We do not ask for your name, postal address or identity documents.
Some features run on servers we operate (hosted by Cloudflare). They are identified by your wallet address, never by your name or device identity, and each keeps only what it needs:
Usernames and leaderboards (optional)
If you claim a username we store it with your wallet address, the time you claimed or changed it, and the message you signed to claim it (which records that you confirmed you are an adult). If you give a name up, it is held for your wallet for 90 days so no one else can take it straight away.
If you join a leaderboard:
- Live trading board: every hour our server reads your account from Hyperliquid's public record and stores your 7- and 30-day return, account value and 30-day trading volume.
- Practice board: the app sends your practice results — the practice balance, 7- and 30-day gain, number of trades and trading days, and worst drop. We keep each report for 90 days so results can be checked before any prize is awarded.
Leaving a board deletes the figures stored for it. Deleting your username takes you off both boards and deletes those figures too.
Notifications and price alerts (optional)
If you turn notifications on, we store your wallet address, your device's push token (issued by Apple or Google), which notifications you chose, the price alerts you set, and a list of your last 100 notifications (which include amounts and prices, for the in-app list). Our server reads your Hyperliquid and Arbitrum activity to know when to notify you. Turning notifications off in Settings deletes all of it.
Gas-free transactions
When the app pays network fees for you — deposits, sends, USDC swaps and cross-chain USDC — the transaction you signed passes through our relay server, which records its progress (your address, the amount and transaction hashes) for 1 to 30 days depending on the kind of transaction. We also keep a short record of which of these features a wallet has used and when it last used them, for 12 months after its last use. Gift and reward claims are recorded against the wallet that claimed them.
Position Radar
Opening Position Radar adds your wallet address to the list of Hyperliquid accounts it follows, so your rank can be shown. Your address is removed 90 days after you last open it. Radar only reads positions that are already public on Hyperliquid.
What our servers do not keep
Your IP address is used only to limit how often requests can be made and is discarded within two minutes. We do not keep request logs, and we never receive your seed phrase, private keys or PIN.
2. What stays on your device
- Your seed phrase and private keys, held in the device's secure storage. They are never transmitted anywhere.
- Your PIN or biometric setting.
- App preferences — display settings, node choice, which tokens you show.
- A local cache of balances and transaction history read from public blockchain data.
- Your practice (paper trading) account — its balance, orders and history. Only the practice results you choose to send to the practice leaderboard leave the device.
Uninstalling the app deletes all of it. Because it never leaves the device, we cannot recover any of it for you.
3. What is shared with third parties
Arbiter cannot function without contacting external services. What each one receives:
Hyperliquid
Your wallet address, and the details of every order you place — market, size, price, leverage, and any stop-loss or take-profit. This is necessary to trade, and orders are signed by your device and sent directly to Hyperliquid. Your address, positions and trading history are recorded on Hyperliquid's public ledger. Orders also carry Arbiter's builder code, which is how the fee described in our terms is attributed.
On-ramp providers
If you buy crypto with a card or bank transfer, you are handed to a regulated third-party provider. They receive your wallet address and the amount, and they will collect identity and payment information directly from you under their own privacy policy. That information does not pass through Arbiter and we never see it.
Exchange providers
When you swap, the providers we query receive the pair, the amount, and the destination address in order to quote and settle. Different providers apply different identity requirements; some ask for none. Swaps routed through LI.FI also send your wallet address as the sender, and the swap itself is carried out by LI.FI's contracts on the blockchain.
Circle
Moving USDC between blockchains uses Circle's cross-chain transfer service, which receives the transaction details needed to complete the transfer.
Apple and Google
If you turn notifications on, your device's push token is used to deliver them through Apple's or Google's push service. The notification itself carries no amounts — it asks you to open the app for the details.
Blockchain nodes
Reading your balance and broadcasting transactions means sending your wallet address to a public Arbitrum node. As with any wallet, the node operator can see that an address was queried and from roughly where.
Price and market data
Exchange rates and market data are fetched from public APIs. These requests carry no wallet address.
4. Crash and error reports
If the app crashes, a diagnostic report containing device model, operating system version and a technical stack trace may be sent so the fault can be fixed. These reports are not intended to contain your address, balances, keys or seed phrase.
5. What is public by design
Arbitrum and Hyperliquid are public networks. Your address, balances, transactions, open positions and trading history are visible to anyone who looks, permanently, whether or not you use Arbiter. This is a property of the blockchain, not of this app.
If you claim a username and join a leaderboard, your username, rank and percentage results are shown to every Arbiter user (on the practice board, also your number of trades, trading days and worst drop). Leaderboards never show your wallet address or dollar amounts. A username you put on a share card is visible to whoever you share it with.
6. Children
Arbiter is not intended for anyone under the age of majority in their jurisdiction, and we do not knowingly collect information from them.
7. Your choices
- Don't want an address shared with an on-ramp? Don't use Buy — fund the wallet by transferring in instead.
- Don't want Hyperliquid to have your address? Use Arbiter as a wallet only and don't deposit to trading.
- Prefer a different node? Change it in Settings → Nodes.
- Don't want a username or a place on a leaderboard? Don't claim one — or leave the board or delete the name in Settings → Trading account settings, which deletes what we stored for it.
- Don't want notifications stored? Leave them off, or turn them off in Settings → Trading account settings → Notifications.
- Want everything gone? Uninstall. Save your seed phrase first — it is the only way back to your funds.
8. Changes
We may update this policy. Material changes will be reflected in the "last updated" date above.