2. Do you do a hard pull of credit?
The Tally algorithm absorbs all this complexity and recommends whatever is in your best interest.
1. With the fact pattern you've provided, there are situations where Tally would only pay the Statement Balance (the smaller amount you mention) so that you can take advantage of your card's grace period.
But if you are not in grace with a card (meaning you haven't paid 100% of your Statement Balances for the previous 2 consecutive statement periods), Tally will suggest paying more/all of the Statement Balance to minimize your interest charges.
Bottom line: Tally is really smart and mathematically suggests whatever is in your best interest.
2. To see if Tally makes sense for you, its a soft pull and then a hard pull to actually open a Tally account.
-Jason (Tally co-founder).
Some of the appeal of the new FinTech startups are that they don't measure customers based off traditional models of risk eval (FICO, etc.) but that they are able to factor in both past and future based on many more data points. I'll keep monitoring Tally and hope in the future you can arrive to this same point.
BTW, I hope you look into marketing to credit card churners. I think they would love your product.