mBit has taken Bitcoin since 2014, which makes it one of the oldest BTC casinos still open. There are no deposit fees, the AskGamblers-reported per-coin minimum is 0.35 mBTC, and your first BTC deposit is the one that triggers the welcome package worth up to 4 BTC + 325 free spins.
Why Bitcoin is the default here
mBit is crypto-only - there is no Interac, no card rail, no fiat wallet at all. Bitcoin is the coin the site was built around in 2014, so if you are picking a single method to fund an account, BTC is the path of least resistance. Every other coin mBit accepts (Ethereum, Litecoin, Dogecoin, Bitcoin Cash, Tether and Ripple) is essentially a variation on the same crypto-only setup.
The minimum BTC deposit
AskGamblers lists the Bitcoin minimum at 0.35 mBTC (that is 0.00035 BTC). I have only seen that figure from AskGamblers, so treat it as their reported number rather than something confirmed independently. Note it is separate from the bonus threshold: the welcome package needs a qualifying deposit of at least 30 USDT or the crypto equivalent, so a bare-minimum 0.35 mBTC transfer may fund your account without arming the offer.
Fees
mBit charges no deposit or withdrawal fees on crypto. The only cost you carry is the Bitcoin network fee your own wallet attaches when it broadcasts the transaction - that goes to miners, not to the casino, and it swings with mempool congestion. On a busy day a small BTC send can cost more in network fees than a stablecoin transfer would.
How the deposit flows
You request a deposit address in the cashier, send BTC from your wallet, and the balance lands after the network confirms. Bitcoin confirmations are slower than most of the altcoins mBit supports, so if you want funds credited faster, Litecoin or Dogecoin settle quicker on-chain. For the full menu of coins and their minimums, see the minimum deposit page.
A word on getting the money back out
Depositing BTC is the easy half. Withdrawals are where mBit's reputation splits: many Trustpilot reviewers (4.4/5 across 483 reviews) report crypto payouts inside hours, but Reddit, Bitcointalk and the AskGamblers forum carry recurring complaints about delayed or withheld cashouts and slow KYC. I would read the withdrawal page before you deposit anything you can't afford to wait on.
Pros
- No deposit fee on BTC - you only pay the network miner fee
- AskGamblers-reported minimum is a small 0.35 mBTC
- Bitcoin funds the up-to-4-BTC welcome package
Cons
- BTC confirmations are slower on-chain than mBit's altcoins
- 0.35 mBTC minimum is single-source (AskGamblers)
- Withdrawal reliability is contested - deposit is the smooth part