Is there a way to identify number of wallets opened by an exchange This is precursor to a data science question. 
Essentially, I am trying to map bitcoin's price to the number of wallets opened today on an exchange. 
It's quite common that the users would put in a buy request tomorrow, so a time series can be applied.
You won't be able to see the number of wallets, but you could get quite an idea by looking at the number of adresses an exchange generated.

( Exchanges such as poloniex only have 1 wallet for all their customers. )

See https://www.walletexplorer.com/wallet/Poloniex.com/addresses

I'm not entirely sure if walletexplorer also tracks coinbase adresses, but in the case it doesn't, you can use http://matbea.net

They currently track over (28.500.000+) coinbase adresses.

https://blockonomi.com/matbea-trace-bitcoin-address/

^^ (I wouldn't recommend using their webwallet though, and i'm also not saying that this is 100% indexing all adresses.)

For example, using matbea.net, i was able to identify 1DUiLkf34q7MVxtRkMAXVtP42UNGRrbftY  as a coinbase adress.

https://www.walletexplorer.com/wallet/000001e522b362b7?from_address=1DUiLkf34q7MVxtRkMAXVtP42UNGRrbftY