Add an ad source to a mediation group

After you’ve set up an ad source and mapped your ad units, you can add the ad source to an existing mediation group. 

To add an ad source to an existing mediation group:

1. Sign in to your AdMob account at https://admob.google.com.
2. Click Mediation in the sidebar.
3. In the Mediation group tab, click the name of the mediation group to which you're adding the ad source. 

4. Choose what type of ad source you're adding:

   Add a bidding ad source to a mediation group

   1. In the Bidding ad sources table, click Add ad source.
   2. Find the ad source in the list that appears or begin typing the name of the ad source in the search box. Click Select next to the ad source you want to add. 
      If you haven’t set up a partnership with this ad source, follow the prompts to sign a partnership agreement and acknowledge the bidding agreement.
   3. Select an existing mapping for your ad unit or click Add additional mapping to set up a new mapping. If you haven't set up any mappings yet, click Add mapping. 
   4. Click Done.

   Add a waterfall ad source to a mediation group

   1. In the Waterfall ad sources table, click Add ad source. 
   2. Find the ad source in the list that appears or begin typing the name of the ad source in the search box. Click Select next to the ad source you want to add. 
   3. If your ad source supports optimization, the optimize toggle is on by default. If you don’t want to optimize this ad source, click the toggle to turn optimization off.
   4. Enter a manual eCPM.

      • For optimized ad sources, this eCPM value is used to order this ad source while AdMob gathers enough historical data for optimization. Once this ad source is optimized, the optimized eCPM is used to order the ad source.
      • For ad sources without optimization, this eCPM value is used to order the ad source in the mediation waterfall.
   5. Select an existing mapping for your ad unit or click Add additional mapping to set up a new mapping. If you haven't set up any mappings yet, click Add mapping. 
   6. Click Done.

   Add a custom event to a mediation group

   1. In the Waterfall ad sources table, click Add custom event. 
   2. Enter a descriptive label for the event. 
   3. Enter a manual eCPM to use for this custom event. The eCPM will be used to dynamically position the event in the mediation waterfall where it will compete with other ad sources to fill ad requests. Additionally, the eCPM will be factored into estimated earnings in the Ads Activity report and LTV metrics in the Cohort report.
   4. Click Continue.
   5. Select an existing mapping to use for this custom event or click Add mapping to set up a new mapping. To use multiple custom events, you’ll have to create an additional mapping for each custom event.
   6. Click Done.
5. Click Save. The mediation group will be saved.