Be mindful of your account type while making calls. Different types have different limits on the total API calls you can make, the number of calls/second, and the publication dates of the articles. Here’s a table for quick reference:
Free TrialProEnterprise
10,000 calls250,000 calls/mocustom limits
1 API call/second5 API calls/secondcustom limits
upto 2 week old articlesall available articlesall available articles
You can check your account type in the dashboard