So there is actually more than one exchange that generates these bars for Yahoo, Google, etc...??? I didn't know more than one source had to be required to cover all these 1 min bars.
Well there are 14+ public exchanges. The CTA + UTP feed are a consolidated feed of all those exchanges, which has 100% market coverage. Unless you're creating your own consolidated feed ( extremely expensive ) you'll need access to the CTA+UTP for full market coverage.
Yes, Polygon offers the CTA+UTP and OTC ( pink sheets ) as well. Our minute aggregate bars go back to the year 2000.
Ah, so I have to build my own tick bars in Multicharts and then export those bars to an external CSV file. BTW: Do you link/connect with Multicharts ? If not, which platforms connect to Polygon.io as a data source ?
Most of our clients use Polygon to build their own custom trading applications. We provide standardized REST and websocket APIs. It may work with some trading software, but it's not something we test currently.