I often strategically buy &/or acquire items for trading that others will like.

Cerato: Pumpkin
Scientist: Botany

Human, Raptor, Flyer, Spitter, & Bruiser items: (Very High)
Tyrant items w/ 1+ copies: (Very High)
Tyrant market items w/ no copies: (Very High)
Tyrant store items w/ no copies: (Very Low - Low)
DO NOT ASK for the last one unless you're offering:
a. Unobtained Tyrant store items
b. 2-for-1 Tyrant store muts (or sometimes 2 muts of any superclass for 1 Tyrant store mut)
c. 3-for-1 Tyrant store skins (or 2 muts of any superclass for 1 Tyrant store skin)
Basically, these items would normally be under a person's NFTs. If it seems too high, it's because I really don't want to trade them in the first place, but I won't pass up CONSIDERING a good deal. Also, note that items offered must be "good", & that even still, there is no guarantee the no-copy Tyrant item will be traded. "Good" means one or more things like: items that I have low or no copies of, items that look cool, items that sell well, etc.

a. Renamed items
b. Steam-designated untradable items that are visible in Inventory but not in trade windows
c. Some store items have clones that are neither orange nor marketable
d. Most bandannas, collars, etc. don't have any type OR class
e. Some Human skins are in Human Cosmetic type
f. Some items have the wrong image or broken images applied, such as my Green Rush spino thumbnail showing the thumbnail of Empress Spino, & Empress Spino's thumbnail showing nothing at all
g. Some mutations don't have 'mut' in the name, such as 'RECENSUS Acro' or 'Confragosus Rex'. Similarly, some skins don't always have the right species name, such as 'Tarakona Tyrannosaurus' instead of 'Tarakona Rex'

Keep abreast of upcoming event items w/ PCE's Special Event Items [trello.com]Trello board! You can also search the board's archived cards to find information &/or confirm the existence of many items you've been searching for; if you don't already have or know such information.

If other avenues of trade compensation aren't enough, I also recognize ADEQUATELY demanded market items from both PCE as well as other games. General fulfillment acceptance probabilities are denoted in parentheses in the cost intervals below:
a. <$0.10: (Zero Chance)
b. $0.10-$0.19: (Very Low)
c. $0.20-$0.39: {Low)
d. $0.40-$0.99: (Medium)
e. $1.00-$1.99: (High)
f. >$2.00: (Very High)
If the item is unobtained AND also belongs to any PCE superclass aside from Tyrant (see info about Tyrant in the next Custom Info Box), its probability is raised by 1 degree.