Case: a currency mismatch made every EUR offer look 8% more profitable than it was

Case: a currency mismatch made every EUR offer look 8% more profitable than it was

The slow bleed: an account ran offers paying in EUR while the tracker recorded revenue as plain numbers and spend in USD. Nobody set a conversion rate, so the tracker compared EUR revenue against USD cost one-to-one.

The reconciliation that caught it:
1. Compared tracker-reported profit against the actual bank statement at month-end
2. Tracker showed +$6,400 profit; the real figure was +$4,100 — a $2,300 phantom
3. Traced it: EUR payouts were being booked at face value, but EUR was worth ~0.92 USD at the time, while spend was true USD
4. Every EUR offer looked ~8% richer than it paid

The fix:
— Set the tracker's revenue currency to EUR with a live (or pinned monthly) conversion rate to USD, the spend currency
— Normalized all historical EUR conversions to USD for a clean baseline
— Added the rate to the launch checklist for any non-USD offer

Outcome: reported ROI on the EUR offers dropped ~8% to match reality. Two of them, scaled on the inflated number, were actually break-even — paused before the next budget cycle.

When revenue and spend live in different currencies, set the rate explicitly. A tracker comparing EUR to USD one-to-one is lying by the exchange rate.

Save this SOP. Run this before every launch.