Whitelist
A whitelist is a list of proven traffic sources that showed the best CPI or ROI during testing, and it's what a buyer narrows spend down to instead of running broad targeting. It's the next step after testing, not a substitute for it.
How a whitelist gets built
A campaign first runs broad, across every available placement inside a geo and vertical, while the tracker logs stats per source individually. Sources with consistently solid CPI and a low fraud rate move onto the whitelist, and spend gradually narrows to just those.
Whitelists in PWA arbitrage
Moving to a whitelist cuts traffic volume in exchange for more predictable ROI — a deliberate trade-off, not a free upgrade. Before locking spend down, it's worth checking whether a source's good numbers came from its own quality or just happened to align with a strong creative — APEX split-tests with sticky visitor bucketing separate those two factors.
FAQ
- When is it time to move from broad targeting to a whitelist?
- Once most placements have enough volume for a confident CPI and ROI comparison — usually a few days of active testing, not the first few hours. Narrowing too early risks cutting sources that simply hadn't had time to show their potential.
- Does a whitelist guarantee stable results forever?
- No — even a proven source's quality can drift over time, so a whitelist needs periodic rechecking rather than being treated as a closed list. Full trust with no follow-up review is a common reason a once-reliable source suddenly starts burning budget.
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