You have to exhaust the initial deposit to get the bonus;
About the bonus
The welcome bonus offer is given to new users who create an account and make their first deposit. You are given a 300% welcome bonus of up to ₦100,000. Simply deposit money in your account using the methods provided to get the bonus after playing the full deposit amount.
To get the welcome bonus, play fully with the money you have deposited in either single or multi-bets of odds of 4.0 or more. After exhausting the amount, wait for your bets to be settled and you will get a 300% bonus to a maximum of ₦100,000. For instance, if your initial deposit was ₦5,000, your bonus is ₦15,000. If you deposit more than ₦100,000, your bonus will not be more than ₦100,000.
How to use Blackbet welcome bonus
You can only stake the welcome bonus on single or multi-bets with odds of 4.0 or more. The welcome bonus can only be used for games in the following football leagues; French Ligue 1, English Premier League, Italian Serie A, Portuguese Liga, German Bundesliga, and Spanish Laliga. You cannot withdraw the welcome bonus until you have wagered 15 times on any sports market with odds of 4.0 or more.