Quick answer: Compute each side's total value, surface the comparison and any large imbalance to both players, and require a fresh confirmation whenever either offer changes.
A trade UI that swaps items the instant both confirm, without showing value, invites scams and mis-trades. Evaluating and displaying each side's value and re-confirming on changes fixes it. Here is how.
How to fix it
1. Evaluate each offer
Sum a reference value for the items and currency on each side so the system and both players can see what each is giving and receiving.
2. Surface imbalance
Show the totals and warn when one side is worth far more, so an honest player is not tricked into a lopsided swap by a last-second edit.
3. Reset confirmation on change
Any modification to either offer must clear both confirmations, preventing the classic swap-after-confirm scam.
4. Validate server-side
For online trades, recompute values and re-check both confirmations on the server at commit time, so a tampered client cannot force an uneven trade.
Catching the ones you can't reproduce
The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.
Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.
This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.
The bug you can't reproduce isn't gone — it's just invisible until you capture it from the player's device.