A very underrated strategy is building your own dataset to trade in @Polymarket. I can guarantee it is one of the best ways, if not the best, to find an edge over the market.
But... Why is it so good?
When you have a quality database, you can check information fast, much quicker than opening random sites and browsing multiple pages just to find info that usually does not match exactly what you need.
You can also control data quality, because you have already studied which sources are usually correct or report things faster.
And you can run some crazy filters to experiment and spot potential meta shifts that no one else is aware of.
I’ll share in the comments some of the websites I use.
Quick reminder: Do not abuse requests if you are using an API and please ASK if scraping data is allowed before doing it.