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This is how the variable portion of your Qyren invoice — the “lift fee” — is calculated. It’s designed to be transparent: you can reproduce the number from data you have direct access to.

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The core idea

When you turn on Qyren, we automatically split your players into two groups:
  • Qyren group — 90% of players. They get personalized recommendations from Qyren.
  • Holdout group — 10% of players. They get your pre-Qyren offer logic (or a neutral default if you had no logic). They do not see Qyren recommendations.
The split is random and sticky per player. A player assigned to the holdout stays there. Both groups play the same game with the same offer catalog. The only difference is who picks which offer to show.

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The math

Over a billing period (monthly), we compute:
  • ARPU_qyren = total revenue from Qyren-group players ÷ Qyren-group player count.
  • ARPU_holdout = total revenue from holdout-group players ÷ holdout-group player count.
  • Lift % = (ARPU_qyren − ARPU_holdout) / ARPU_holdout.
  • Incremental revenue = (ARPU_qyren − ARPU_holdout) × Qyren-group player count.
  • Lift fee = Incremental revenue × your lift rate (20% on Growth, 15% on Founding, negotiated on Scale).
If ARPU_qyren ≤ ARPU_holdout, the lift fee is $0. You only pay on proven uplift.

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Worked example

A Growth-plan studio, one month:
  • Qyren group: 45,000 players, $18,900 revenue. ARPU_qyren = **$0.42**.
  • Holdout group: 5,000 players, $1,550 revenue. ARPU_holdout = **$0.31**.
Calculation:
  • Lift % = (0.42 − 0.31) / 0.31 = +35.5%.
  • Incremental per-player = $0.42 − $0.31 = $0.11.
  • Incremental revenue = $0.11 × 45,000 = **$4,950**.
  • Lift fee = $4,950 × 20% = **$990**.
That month’s invoice:
  • Growth base fee: $499.
  • Lift fee: $990.
  • Total: $1,489.
For that $1,489, the studio earned $4,950 in incremental revenue — a net gain of $3,461 they would not have had without Qyren. If they were on the Founding rate (15%), the lift fee would be $742.50 and total $991.50.

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If lift is zero or negative

It happens — especially in the first 2–3 weeks while the engine is still learning. Your bill in those months is just the base fee ($499 on Growth, $249 on Founding). We don’t charge for losses. If lift stays non-positive for three consecutive months, we’ll reach out directly. Usually it means the integration is missing an event type (most often offer_impression), which prevents the engine from learning.

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Why a holdout is mandatory

Without a holdout, we’d have to claim lift using modeling tricks — “we predict you would have earned X without us.” That’s not honest. With a holdout, the math is a simple subtraction anyone can audit. The cost to you: you’re leaving roughly 10% of your personalization upside on the table. At typical lift values, that’s a small price for being able to prove the number is real. If the holdout ever becomes an issue (e.g. for a specific A/B test), it can be paused for a defined window by support request — the paused window is excluded from billing that month.

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Where to see this on the dashboard

The Billing tab shows:
  • Current-period ARPU for both groups, updated daily.
  • Projected lift fee for the month.
  • Historical monthly lift trends.
  • A downloadable CSV of the raw numbers so you can reproduce our math.