The visitor's country, grouped into tiers that broadly track payout and traffic cost — Tier-1 highest, Tier-3 cheapest.
"Geo" is the geographic market a lead belongs to, resolved from IP and phone country. Media buyers group geos into tiers: Tier-1 covers high-income, mostly English-speaking markets (US, UK, CA, AU, and Western Europe) with high payouts and high competition; Tier-2 covers mid-income markets; Tier-3 covers low-cost, high-volume markets.
Payout, conversion behaviour and fraud patterns differ by geo, so offers are targeted per market and routing sends each geo's leads to advertisers that accept it. A geo mismatch — an IP in one country and a phone in another — is itself a fraud signal.
In d0pe routes match leads by geo condition in priority order, so each market's traffic reaches the right recipient.