I refer to the c$ charts
here and then use the conversions from c$->FR gems to price pets.
Prices on each site:
80c$ = 5 USD
500g = 5 USD
The proper conversion would be:
6,25 g = 1 c$ *edit: (whoops)
I also still see people commonly trade 1:4 or 1:5 gems (because the price for chicken dollars has gone up in the last year or so)
Ie. a new store pet worth 20c$ would be worth 80-125 gems (you can multiply that by 1000 for treasure also)
Here's the forum you want to use to advertize cross trading:
Trades & Auctions for Other Websites and I would highly suggest reading the
Offsite Trading Rules. It's always a good idea to communicate clearly in your trade messages that this is an off-site trade (on BOTH websites). Communicate in suggestions until you have come to an agreement! Include username for both sites and what you are supposed to receive, so if you get scammed you can report it and prove it was meant to be an off-site trade (and hopefully get your stuff back). I have yet to have an issue trading off-site, almost everyone seems honest!
Hope this helped ^^"