Obtain symbol list for tradable token pairs

The endpoint GET /api/v3/allOrders and GET api/v3/myTrades requires a valid “trading token pair” aka symbol. What resource(s) should be used to acquire a list of valid symbols?

If not, what is the best strategy to compute such a list in order to build a valid symbol-list?

How is the Weight(IP) affected my multiple subsequent calls? Is Weight affected by concurrent or subsequent calls?

My use case is to obtain all orders for 2021 for taxable purposes. I’m building my own app managing taxes.

get_exchange_info has key “symbol”, it has all symbols information