Price does not always scale with what you ask for
Some endpoints charge a flat fee regardless of payload, which cuts both ways: generous on bulk requests, terrible on small ones.
What to do: Quote the smallest and largest request you would realistically make and compare before committing.
One market data endpoint charges the same cent for one coin or twenty. A gift card endpoint quotes a flat $25.00 whether you want a $5 card or a $1 top-up, and $500.00 for a malformed body.