Depending on the number of searches you plan to make, you could load your account balance in multiples of N1000. Each search will reduce your checkmypeople.com balance by N1000, while a NIN Verification will reduce balance by N200. until you exhaust your balance.
Once you are down to a balance < N1000, you will need to load your account balance again to perform additional searches. You may continue verification with a balance of N1000 until your balance goes below N200.