I think the current limit is 150 datapoints/day/goal. (https://forum.beeminder.com/t/is-there-a-limit-on-daily-api-use-for-a-goal/4737)
Lots of times, if you’re running into that limit, you can edit the day’s datapoints rather than make hundreds of individual points, but maybe there are times that can be tricky or just not make sense. What are you working on?