The Challenge
A regulated crypto exchange was reporting strong registration growth and a falling cost per signup, but revenue was not moving with it. The marketing team optimised every channel against registrations, so the AI-driven bidding on app and search campaigns had learned to find the cheapest possible signups — a large share of which never completed KYC, and of those that did, fewer than a third ever made a funded deposit. Nobody could answer the only question that mattered: what did it actually cost to acquire a trader who deposited and traded.
The funnel leaked worst between KYC and first deposit, where roughly 70% of verified users dropped off, but this was invisible in the dashboards because deposits were tracked on the backend and never reconciled against ad-platform conversions. Paid acquisition, organic, and an under-resourced community channel were all measured in isolation, double-counting demand and starving the one channel whose cost compounded down over time.
The Approach
We re-anchored the entire growth function on a single conversion: the funded trade. Backend deposit and first-trade events were imported into GA4 and the ad platforms with deposit value passed as conversion value, so Smart Bidding, App Campaigns, and Apple Search Ads optimised toward funded traders instead of registrations. Registration was demoted to a secondary, observed event.
With the leak finally visible, we instrumented every step from KYC start to first deposit, reviewed session recordings of the drop-off points, and shipped fixes in priority order: clearer KYC expectations set before signup, a rebuilt fiat on-ramp step with regional payment methods, and trust proof — proof of reserves and security posture — surfaced at the deposit screen rather than buried in a footer.
On measurement, we replaced reported ROAS with contribution margin per funded trader and ran a quarterly geo holdout to separate incremental from reported CAC. The gap was roughly 2.6x. Budget was reallocated away from channels that looked cheap on signups but failed on funded traders, and into branded and high-intent app search plus a properly resourced referral loop and moderated community, with referrals rewarded only on a referred user's funded deposit so the loop could not be farmed.
The Results
Within one quarter, cost per funded trader fell 44% on roughly flat total spend, because budget was no longer buying registrations that never deposited. Deposit conversion rate improved from 31% to 58% as the KYC-to-deposit friction was removed and trust proof was placed at the point of doubt. The geo holdout corrected a 2.6x overstatement in platform-reported CAC, which changed how budget was allocated for the rest of the engagement. The referral loop and community channel, once measured on funded traders rather than signups, emerged as the lowest blended-CAC source by the end of the quarter and was scaled accordingly.
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