There is the minimum to fund your account (a small per-coin amount) and the minimum to arm the welcome package, which is a qualifying deposit of at least 30 USDT or the crypto equivalent. They are not the same number, and confusing them is the easiest way to deposit and then wonder why the bonus didn't attach.
The bonus floor: 30 USDT
mBit's welcome package - up to 4 BTC + 325 free spins spread across your first three deposits - requires a qualifying deposit of at least 30 USDT or crypto equivalent. Since mBit is crypto-only (no fiat, no cards, running since 2014), you meet that floor by sending whichever coin you hold at roughly the 30 USDT mark or above.
Per-coin deposit minimums
The account-funding minimums below come from AskGamblers and are the only published figures I have for them, so treat the whole table as AskGamblers-reported rather than confirmed. Several of these sit well under 30 USDT in value, meaning a bare minimum deposit can leave the bonus untriggered.
| Coin | Minimum deposit |
|---|---|
| Bitcoin (BTC) | 0.35 mBTC |
| Ethereum (ETH) | 0.01 ETH |
| Litecoin (LTC) | 0.14 LTC |
| Dogecoin (DOGE) | 115 DOGE |
| Bitcoin Cash (BCH) | 0.05 BCH |
| Tether (USDT) | 10 USDT |
| Ripple (XRP) | 25 XRP |
Why USDT makes the maths easy
Because the bonus floor is quoted in USDT, a stablecoin deposit is the one where you know exactly where you stand: the funding minimum is 10 USDT, and topping to 30 USDT clears the bonus threshold without price guesswork. With a volatile coin like Dogecoin or Ethereum the fiat value of your deposit moves with the market, so the same coin amount might qualify one day and fall short the next.
Fees on any of these
None from mBit - deposits and withdrawals are fee-free across all seven coins. Your only cost is the network fee your wallet attaches, which is why cheaper-to-move coins like Litecoin can edge out Bitcoin on a small deposit.
One caveat before you fund
Clearing the deposit minimum is the simple bit. Whether you get paid out smoothly is the contested bit: Trustpilot reviewers (4.4/5, 483 reviews) frequently report fast crypto payouts, but Reddit, Bitcointalk and the AskGamblers forum log recurring delayed-withdrawal and slow-KYC complaints. The withdrawal page covers that in full.