What's private
One shared wallet makes every trade for every account. On chain you see Sanctum trading, never who asked. Here is exactly what the chain does and doesn't see at each step.
StepPublicHidden
Sign upNothing (a key is made in your browser, or derived from one wallet signature)–
Deposit to your addressSender, amount, that the address is Sanctum'sWhat you do next
Buy / sellSanctum traded on JupiterThat it was you
Limit, take profit, stop loss, DCANothing until it fillsYour targets
Pay a @nameNothingEverything
Withdraw to any walletSanctum paid that address, amountThat it was you
What it costs you in trust
Sanctum holds funds while you trade, like an exchange does. That is the trade for privacy, so it has to be checkable: a proof of reserves every five minutes, an audit every 30 seconds that halts everything on any shortfall, and a withdraw button that pays any wallet.
Limits and fees
Up to 2 SOL per trade and per withdrawal. 1% per trade plus the network cost. 0.002 SOL per withdrawal. Payments between accounts are free. Coins with a freeze authority or risky token extensions are refused.