Deposit and Withdraw BNB from the Trading Vault

Understand the difference between your wallet balance and vault balance, and how to move BNB in and out of the TradingVault smart contract.

Quantum Finance keeps two separate balances for each user. Your wallet balance is native BNB held directly in your Web3Auth wallet — it is yours at all times. Your vault balance is BNB you have deposited into the TradingVault smart contract; this is the pool the engine draws from when executing Real mode trades. You must deposit into the vault before the engine can place trades on your behalf.

Wallet balance vs vault balance

	Wallet balance	Vault balance
Location	Your Web3Auth wallet (BNB Chain)	TradingVault smart contract
Used for	Gas fees, sends, swaps	Real mode trade execution
Visible in	Wallet tab and Trading tab	Trading tab (Vault Liquidity)
Access	Always — no lock-up	Withdraw at any time when engine is idle

Deposit BNB to the vault

1. Go to the Trading tab

   Open the Trading tab from the main navigation. Make sure you are in Real mode — vault deposits are only relevant for live trading.

2. Enter a deposit amount

   In the Trading Setup panel, find the Deposit input field (left of the two input fields near the top of the panel). Type the amount of BNB you want to move into the vault.

3. Click Deposit

   Click the Deposit button. Your Web3Auth wallet prompts you to confirm the transaction. Approve it.

4. Confirm the updated vault balance

   After the transaction is confirmed on-chain, the Vault Liquidity figure in the Trading Setup panel updates to reflect your new balance.

A minimum of approximately 0.1 BNB in the vault is recommended to activate Real mode trading. The exact amount required depends on your selected trade amount and the current BNB price.

Withdraw BNB from the vault

1. Stop the engine if it is running

   You cannot withdraw while the engine is active. If STOP ENGINE is shown, click it and wait for the engine to settle open positions before proceeding.

2. Enter a withdrawal amount

   In the Withdraw input field (right of the two input fields), type the amount of BNB to return to your wallet.

3. Click Withdraw

   Click the Withdraw button and confirm the transaction in your wallet. The funds are returned to your Web3Auth wallet balance.

Always leave at least 0.001 BNB in your wallet after any withdrawal to cover gas fees for future transactions. If your wallet BNB falls to zero, you will not be able to submit any on-chain transactions.

How vault requirements are calculated

Before the engine starts a Real mode trade, it checks whether your vault has enough BNB to cover the trade amount:

required BNB = trade amount (USD) ÷ BNB price (USD)

For example, a $100 trade when BNB is priced at$600 requires:

$100 ÷ $600 = 0.1667 BNB

If your vault balance is lower than this threshold, the engine will not start and you will see an INSUFFICIENT VAULT FUNDS error. Either deposit more BNB or reduce your trade amount.

The current BNB price is fetched live from CryptoCompare (with Binance as fallback) and displayed in the market ticker at the top of the Trading tab.