What does it cost?
There is a permanent free tier, and two paid tiers are planned.
The free tier stays free: build a list, compare it and see where it costs less, within a daily usage limit. You can start without an account; registering, also free, raises the limit and keeps your lists. The two paid tiers — Subscribed and Premium — will add things like the full ranked table across every chain, per-item breakdown, price history and alerts. Note that the paid tiers do not exist yet, and we will never charge you without you explicitly choosing to subscribe.
The public pages carry advertising slots, always labelled as advertising. That advertising is part of the revenue model that keeps the free tier free.