entity
Polygon.io
Polygon.io
Polygon.io is the market-data API used in Brevvie Python + AI — Section 4: APIs, Postman & Calling the Web. It demonstrates a keyed API with terse field names and date-ranged financial data.
Role in the source
- fetches QQQ daily aggregate bars
- introduces compact field names like
o,c,h,l,v, andt - reinforces the need to read API docs because naming conventions vary