Bitcoin is not a payment system.  It is a speculative gamble token, that people buy to sell to a greater fool mostly.
Apart from some geeks, and apart from dark markets where it becomes dangerous, nobody uses bitcoin seriously as a payment system on any large scale.  It is too unreliable, risky, and the volatility is making it impossible to write serious contracts in.
For casual value transfers that cannot see the daylight, and for the moment still for things where you want privacy, it is a clumsy payment option, yes.  But where bitcoin has been used mostly, and constantly, during the last 8 years, is in pure speculation in greater fool games, also known as trading.

Bitcoin is a trader asset.  Not a payment system.  But if you really want to, and you really have a good reason, with some effort you can also pay with it.

no there is no way. bitcoin is what they call "pseudo-anonymous". which means all you can do is to query the blockchain and find how much bitcoin belongs to what key (how much each bitcoin address has balance).
like this: https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html
but you can never tell if an address belongs to an individual or a service. for example we know the second address in that list (as the tag under it says) belongs to a service called bitfinex which is a bitcoin exchange service.

go through that link, i guess it has the data you are looking for.

Sounds like what you really want is tether, its a digital currency that runs on the blockchain fixed to the US$.

That is the only way to guarantee you have the same value later on as what you put in or received.