Unfortunately, as far as I know, there’s no way to get GPT-3 to “read” the content of url links. You should be able to use a programming language to make an http request for the url links, then convert the text to readable text, then summarize that. The total of summaries + completion must be less than 2048 tokens (1500 words), so the more summarized article you provide, the less completion you get back.
Its definitely possible however you need to have the ability to put the stock data in the prompt somehow. If you can do that, you can create an article automatically. See how I used open AI to do similar tasks (not exactly the same purpose as yours)