With Auto Wallet Transfer, your Bitcoin automatically moves to your own wallet – self-custody on autopilot. You set a balance limit, and as soon as it's reached, 21bitcoin automatically withdraws your Bitcoin to your external wallet. For example, you can add your BitBox hardware wallet and set your Bitcoin to be withdrawn as soon as your balance reaches ~€500.00.
Why Auto Wallet Transfer?
21bitcoin makes self-custody easier and cheaper than any other platform:
Fixed, low withdrawal fee: You always pay just 1,000 sats (0.00001 BTC) per withdrawal – no matter how high network fees are at the time. No guesswork, no surprises.
Withdrawal in the next block: Your Bitcoin arrives in your wallet in about 10-30 minutes – instead of waiting hours or even days, as is common with many other providers.
True self-custody, automated: Your Bitcoin regularly lands in your own wallet without you having to think about manual withdrawals. Not your keys, not your coins.
Smart UTXO management: Instead of many small withdrawals, you first accumulate a balance and withdraw it in one batch. This reduces the number of your UTXOs – and saves you fees on future transactions from your wallet.
How to set up an Auto Wallet Transfer
Navigate to the home screen and scroll to the Auto Wallet Transfer card
Tap "Set limit"
Choose a limit and tap "Add wallet"
Select an existing wallet or add a new one
Tap "Confirm" to set up the automatic withdrawal
You can adjust your limit at any time – and pause or deactivate the Auto Wallet Transfer whenever you like.
Images are for illustration purposes only and are not a recommendation.
Common use cases
You want to self-custody your Bitcoin: Your Bitcoin automatically lands in your own wallet (e.g. hardware wallet) – you stay in full control.
You want to save on transaction fees: One batched withdrawal at a fixed fee of 1,000 sats instead of many individual transfers.
You want to reduce the number of your UTXOs: Fewer UTXOs in your wallet mean lower fees when you move your Bitcoin later on.
How to deactivate an Auto Wallet Transfer
Navigate to the home screen
Scroll down to the Auto Wallet Transfer card
Tap the card
Tap the "Deactivate" button
Confirm the deactivation
Notes
Bitcoin transfers are final and cannot be reversed. Please always double-check the wallet address when sending Bitcoin to an external wallet.
The Auto Wallet Transfer is triggered as soon as your balance reaches the set limit plus 1,000 sats (fixed withdrawal fee covering the Bitcoin network fee). Example: With a limit of 2,100,000 sats, the automatic withdrawal is triggered once your balance reaches 2,101,000 sats.