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Overview

Ostium offers two ways to connect: email login (smart account) or Web3 wallet. Both methods are non-custodial and require no KYC. Trading is settled on .
FeatureEmail LoginWeb3 Wallet
Setup time~30 seconds~1 minute
KYC requiredNoNo
Gas feesPlatform-sponsored (no ETH needed)You pay gas in ETH
CustodySmart account on ArbitrumYour own wallet
1-click tradingBuilt-inEnable separately
Ostium login screen

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How to Connect

Email login creates a smart account on Arbitrum, managed by you but with gasless transactions. Your funds remain under your control; Privy manages the account infrastructure without accessing your keys.
1

Open app.ostium.com and click Connect

Open app.ostium.com and click “Connect.”
2

Select Email

Choose the “Email” option.
3

Enter your email address

Type your email address.
4

Check your inbox for verification code

Look for a code from no-reply@privy.io. Check spam if it doesn’t arrive within a minute.
5

Paste the verification code

Copy the code and paste it back into Ostium.
6

Account created

Your smart account is created and ready to fund. Your address appears in your profile.
Smart accounts deduct 2 USDC from your balance to ensure you can always withdraw. This covers gas fees for future withdrawal transactions.

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Enable 1-Click Trading

1-click trading pre-approves transactions so Ostium can execute trades faster without requiring manual approval for each order.
1

Go to your profile settings

Open your profile settings page.
2

Enable 1-Click Trading

Find “1-Click Trading” and click to enable.
3

Approve the required transactions

Follow the module steps and approve in your wallet. Requires a small amount of ETH for gas.
Once enabled, future trades execute without additional prompts. Disable anytime from your profile.

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Security & Non-Custody

Both connection methods are non-custodial. With email login, Privy manages the smart account infrastructure but cannot access your funds; only you can authorize transactions. With Web3 wallet login, you hold your private keys and full control. In both cases, Ostium never stores or accesses your authentication credentials or keys.
Only send Arbitrum USDC to your account address. Sending other tokens or using a different chain risks permanent loss of funds.

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Troubleshooting

Email verification code not arriving? Check your spam folder. If still missing, wait 5 minutes and request a new code. Privy support is available at Privy Help. Wallet connection fails? Ensure your wallet is on Arbitrum network. Try disconnecting and reconnecting. If issues persist, clear your browser cache and try a different wallet or browser. Not enough ETH for gas? Web3 wallet users need a small amount of ETH on Arbitrum to approve transactions and execute trades. If your transactions are failing, check your ETH balance. You can bridge ETH to Arbitrum using the Arbitrum Bridge or buy ETH directly on Arbitrum through an exchange that supports Arbitrum withdrawals. Gas fees are typically under $0.01 per transaction, so even a few dollars of ETH will last a long time.

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FAQ

Email login requires no gas fees and includes built-in 1-click trading. Web3 wallet provides full self-custody. Both are equally secure and non-custodial.
No. Email and Web3 wallet logins create separate accounts. You cannot merge them. If you want to use a different method, create a new account.
Yes, if you use the same login method (same email or same wallet). Your balance and positions sync across all devices automatically.
With email login, no; Ostium covers all gas. With Web3 wallet, you pay small gas fees in ETH for transactions (approval, trades). Arbitrum gas is typically under $0.01 per transaction.