'How to fetch data from a website without using API?

I am trying to build a REST API project with spring boot which is getting the available currencies and USD-FX exchange rates and etc. But the problem is that the currency exchange rate-related websites just provide an API only for the Exchange currency rate or the ones with more options don't give it for free. So there is a website that does not provide an API but it presents the data with time series. So is there any way to use time series instead of API in the project?



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