Here are some of the best APIs to return public national holidays:
Pricing varies depending on the API. For example, HolidayAPI has a tiered pricing plan, ranging from $0 per month to $39 per month depending on the usage you require.
API stands for Application Programming Interface. APIs act like building blocks, and allow you to create applications much faster. It is more efficient and convenient to use the capabilities of one of the APIs than to try to independently implement similar functionality. See a simple API example here.
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