2. For example, Sina Finance has opened its own API interface.

3. paid. For example, Weishang is providing a special real-time market API for finance (stock/futures/foreign exchange). Your developers use their API to develop corresponding programs/web pages, and then display them on your own website.

4. If the website to be called is a personal website and is not used for commercial purposes, call it according to your own needs.

If the website you want to call is a commercial website, you need to consider negotiating with a company with a data interface.

5. Calling other people's data at will by reading the address obtained from the source code of other people's web pages will involve copyright issues.