X API v2 has a Post consumption cap that limits the number of Posts that can be retrieved from specific endpoints on a monthly basis. Post caps apply at the Project level, meaning that any requests to the endpoints listed below using the keys and tokens from developer Apps within that Project will count towards the Project Post cap.
The Post cap volume varies based on your access level:
Access Tier
Monthly Post Cap
Free
1,500 Posts per month
Basic
10,000 Posts per month
Pro
1,000,000 Posts per month
Enterprise
50+ million Posts per month
You can check your usage towards the monthly Post cap by viewing the main dashboard page in the developer portal. Under the name of your Project, you’ll see a status bar that shows your current month’s usage in relation to the Post cap, including the total Posts pulled, the percentage of Posts used, and the reset date for your usage.