> I have no idea if they prorate charges if you use less than 1000 calls so lets assume they don't, so the minimum daily cost for a user is $0.24.
The way these things work nearly everywhere is that $0.24 for 1000 API calls means your cost in a given billing period for N API calls during a billing period is 0.24 ⌈N/1000⌉ or 0.24 N/1000. The first is if they do not prorate, the second is if they do.
If it takes on average 345 requests per day per user, that would be 10 500 per month per user, which would be $2.64 per month per user if they do not prorate and $2.52 per month per user if they do prorate.
The way these things work nearly everywhere is that $0.24 for 1000 API calls means your cost in a given billing period for N API calls during a billing period is 0.24 ⌈N/1000⌉ or 0.24 N/1000. The first is if they do not prorate, the second is if they do.
If it takes on average 345 requests per day per user, that would be 10 500 per month per user, which would be $2.64 per month per user if they do not prorate and $2.52 per month per user if they do prorate.