How to Limit Bidders by Country (Geo Whitelist)
Many SSPs and exchanges only have meaningful demand in certain regions. Sending them bid requests from every country adds latency and infrastructure cost without generating revenue. The per-bidder geo whitelist lets you limit each client-side Prebid bidder to the countries where it actually buys.
Typical use cases:
- A bidder only has demand in specific markets (for example, a US-only or EU-only SSP).
- Reducing the number of wasted bid requests to improve page performance and bid density.
- Restricting a bidder to markets where your contract or its policies allow it to run.
1. Go to the Prebid Vendors Page
From the sidebar, navigate to Connect > Prebid Vendors. This page requires admin permission and lists all available client-side Prebid bidders for your organization.
2. Enable the Bidder
Tick the checkbox next to a bidder to enable it. Once a bidder is enabled, a country selector appears next to it.
3. Select the Allowed Countries
| Field | Purpose | Options / Configuration |
|---|---|---|
| Country selector (per bidder) | Limits the bidder to users located in the selected countries. Outside these countries the bidder receives no bid requests. | Default: ALL (no restriction, the bidder runs in every country). Select one or more countries to restrict it. Supports multiple selections. |
For example, selecting United States and Canada for a bidder means that bidder only participates in auctions for visitors from the United States and Canada. All other enabled bidders are unaffected.
Notes:
- Leaving the selector empty or set to ALL keeps the bidder active in all countries.
- The whitelist is stored per bidder. Disabling a bidder removes its geo whitelist.
- The setting applies organization-wide to all projects that use the enabled Prebid vendors.
4. Click "Save Changes"
The geo whitelist is saved and included in your ad configuration. It takes effect when the updated configuration is published to your sites.
By combining the per-bidder geo whitelist with your bidder line-up, you send each demand partner only the traffic it can monetize — fewer wasted requests, faster auctions, and a cleaner setup across markets.