I am currently making a bitcointalk API for bounty managers.
Almost all of the features that a bounty hunter needs will be added like user posts (detailed), post date, post location, etc.
You're a bit unclear on the second line but I'm guessing, you meant "bounty manager".
How much do you think I should charge users per thousand api calls?
IIRC, few users tried to do the same thing but never succeeded (in making bounty managers using it since it doesn't cover everything [it can't check the quality of each post, when it comes to signature campaigns]), so charging for something that they still need to do some steps manually, might not be the best option.