Credits are simple: you pay to process a pack of numbers. If 30% of a list is dead, a large share of that pack did no useful work. A WhatsApp number filter on an opted-in export is often cheaper than sending first and discovering bounces later.
A plain example
Suppose your 10K pack price is set in admin (the public site shows that 10K figure only). You run the filter, keep the live opted-in rows, and message that subset. You are not paying to “discover” strangers — you are cleaning a list you already had permission to use.
What not to do
Do not inflate lists with purchased dumps to “make the filter worth it.” That is spam infrastructure, not list hygiene. WaleadGoal forbids it.
See live 10K prices on the homepage. After you register, 50K and 100K packs follow a fixed ratio from that 10K price (the same structure as $5 / $20 / $35).