0
$\begingroup$

First time posting on this stack exchange, but I was using Polygon to get some Market Data recently, and I was curious about one thing.

Where do they get their data from? Might be a dumb question, but what's stopping "normal" investors from making their own API? Thanks!

$\endgroup$

1 Answer 1

1
$\begingroup$

You need a connection to the data providers (e.g. exchanges). You can see details on Poligon's website.

enter image description here

A counter question may be, what prevents you from building your own numpy or R charting library? Or a bit broader, bake your own bread, build your own car?

Usually the answer will be that someone already spent a lot of time and resources on building something that just works well, and trying to replicate this will just take unnecessary time.

$\endgroup$
1
  • 1
    $\begingroup$ If you would like to hook up to the NYSE directly, the prices are not cheap nyse.com/publicdocs/nyse/data/NYSE_Market_Data_Fee_Schedule.pdf and that's just 1 data source. There will usually be 1 or 2 intermediaries between that feed and an ordinary user, providing data checking/reformatting, storage, backup, and other necessary functions. $\endgroup$
    – nbbo2
    May 7, 2022 at 12:16

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.