trading – Localbitcoins history btc_in_usd rate?

In 2016 Localbitcoins (LBC) introduced a new stable variable for price equations called btc_in_usd. It was/is based on the rates of the seven most famous exchanges, and LBC calculates a median price from all these sources for btc_in_usd.

Is it possible to fetch history btc_in_usd for my trade, i.e. the rate which was active on LBC at the moment buyer bidded my advertisement? Or just at any point of time.

Thinking from the other side, can I get the price equation for any trade I made, to calculate history rate myself using traded amount?

If it is not possible, maybe I can get history rates from all these exchanges for and calculate this median myself? Are there sources for that?

Thanks in advance.