Average Bids Asks on my site

[Krispykreme]

Hello.
Im looking at doing an alts information site (btc overexposed)
and what I'd like to have on there is a section where average
bids/asks is displayed.. meaning: script would fetch bids/asks of
3 or 4 sites and average that out and display on my site. posted
on freelancer but kept getting the runaround.

thansk ahead of time