[Note: If this tool existed, I would use it. But I think it’s also fair to suggest that the game might be better without this tool.]
Player X is up for auction. I’m thinking about bidding Y. If I could look up for similar leagues to mine what Player X has auctioned for (in all history or just last 10, for example), that would be useful as I consider bid Y.
I think adding a rolling average of the last 10 adds would do a good job of quickly showing what a player is going for across the Ottoneu universe right now. That could be a low-impact quick addition to the player page.
A list of all transactions across all leagues that is searchable would be quite large and resource-intensive. If the value-add is understanding what a player is going for, a rolling average is a much easier way of indicating that.
I’m open to the idea that the rolling average should be over X days instead of X transactions.
For trades, there is a live trade feed thread that can be searched.