You indicate that :
"Usage is free for all users, up to 100 queries per day.
you will be billed for all requests at the rate of $5 per 1000 queries, for up to 10,000 queries per day."
We don't understand if it means:
if i use 1000 requests per day for 2 days (2000 requests) , will i be charged for 5$ or 10$. ?
If i use one day 150 requests, and the day after i use 200 requests how much will i be charged ?