Every mobile app developer wants to maximize advertising revenue while maintaining a great user experience.
One of the most important monetization decisions is choosing between:
- AdMob Waterfall Ads
- AdMob Mediation
Although both approaches allow multiple ad networks to serve ads, they operate very differently and can significantly impact your eCPM, fill rate, and total earnings.
In this guide, we’ll compare AdMob Mediation and Waterfall Ads, explain how they work, and help you choose the best strategy for your app in 2026.
What Is AdMob Waterfall Advertising?
Waterfall advertising is the traditional method of serving ads from multiple networks.
When an ad request occurs, ad networks are contacted one by one based on priority.
Example waterfall:
1. AppLovin ($20 eCPM)
↓
2. Unity Ads ($15 eCPM)
↓
3. Meta Audience Network ($10 eCPM)
↓
4. AdMob Network ($5 eCPM)
The first network that successfully fills the request serves the ad.
How Waterfall Ads Work
- User requests an ad
- Highest-priority network receives the request
- If no ad is available, the next network is contacted
- The process continues until an ad is served
Example:
User Opens App
↓
AppLovin No Fill
↓
Unity Ads No Fill
↓
Meta Audience Network Fills Request
↓
Ad Displayed
Advantages of Waterfall Ads
Easy Setup
Waterfall configurations are simple and beginner-friendly.
Full Manual Control
Developers decide:
- Network priority
- eCPM floors
- Request order
Predictable Ad Delivery
You know exactly which network receives requests first.
Disadvantages of Waterfall Ads
Lower Revenue Potential
A higher-paying network may never get the chance to bid because another network filled the request first.
Increased Latency
Multiple ad requests may occur before an ad is found.
This can lead to:
- Slower loading times
- Poor user experience
Constant Optimization Required
eCPM values change frequently.
Manual adjustments are often necessary.
What Is AdMob Mediation?
AdMob Mediation allows multiple ad networks to compete for every impression.
Instead of checking networks sequentially, mediation uses automated optimization and bidding technology.
Example:
AppLovin
Meta Audience Network
Unity Ads
ironSource
AdMob
↓ Compete
Highest Bid Wins
The network offering the highest value serves the ad.
How AdMob Mediation Works
User Opens App
↓
Networks Submit Bids
↓
Highest Bid Wins
↓
Ad Displayed
No manual ordering is required when using bidding-based mediation.
Types of AdMob Mediation
Traditional Waterfall Mediation
Networks are manually prioritized based on estimated eCPM values.
Bidding Mediation
Networks participate in real-time bidding.
The highest-paying advertiser wins the impression.
This has become the preferred monetization model in 2026.
Advantages of AdMob Mediation
Higher Revenue Potential
More competition often results in:
- Higher eCPM
- Improved fill rates
- Increased revenue
Automatic Optimization
AdMob helps optimize network performance automatically.
Less manual intervention is required.
Better Fill Rates
Multiple networks compete simultaneously, reducing missed opportunities.
Faster Ad Serving
Modern bidding systems can reduce latency compared to traditional waterfalls.
Disadvantages of AdMob Mediation
More Complex Setup
Developers must:
- Create multiple ad network accounts
- Install mediation adapters
- Configure SDK integrations
Ongoing Maintenance
Mediation adapters require regular updates.
Larger App Size
Adding multiple ad network SDKs increases APK and AAB sizes.
Revenue Comparison Example
Assume an app receives:
100,000 impressions per day
Waterfall Setup
Average eCPM:
$4.50
Daily Revenue:
$450
Mediation Setup
Average eCPM:
$6.50
Daily Revenue:
$650
Potential Increase:
+$200/day
Actual results vary depending on geography, audience quality, and ad placement.
AdMob Mediation vs Waterfall Ads Comparison
| Feature | Waterfall Ads | AdMob Mediation |
|---|---|---|
| Setup Simplicity | Easy | Moderate |
| Revenue Potential | Medium | High |
| Fill Rate | Medium | High |
| Manual Optimization | Required | Minimal |
| Latency | Higher | Lower |
| Scalability | Limited | Excellent |
| Real-Time Bidding | No | Yes |
| Maintenance | Moderate | Moderate |
Popular Networks for AdMob Mediation
- AppLovin
- Meta Audience Network
- Unity Ads
- ironSource
- Pangle
- Mintegral
- Liftoff Monetize
- AdColony
Combining multiple high-quality networks increases competition and revenue opportunities.
When Should You Use Waterfall Ads?
Waterfall advertising may be suitable if:
- You are new to mobile monetization
- Your app has low traffic
- You use only one or two networks
- You want a simple setup
When Should You Use AdMob Mediation?
Mediation is ideal if:
- Your app receives significant traffic
- Revenue optimization is important
- You want higher fill rates
- You use multiple ad networks
- You are building a long-term monetization strategy
Common Monetization Mistakes
Using Only AdMob Network
Many developers lose revenue by relying on a single ad network.
Ignoring Bidding Networks
Real-time bidding frequently outperforms traditional waterfall setups.
Not Monitoring eCPM Trends
Even mediation setups require regular performance reviews.
Adding Too Many Networks
More SDKs do not always mean higher revenue.
Focus on proven networks.
AdMob Mediation Best Practices
- Enable bidding whenever possible
- Monitor eCPM regularly
- Track fill rate and match rate
- Update mediation adapters frequently
- Test network performance by country
- Optimize ad placement strategy
Frequently Asked Questions
Does AdMob Mediation Increase Revenue?
In most cases, yes. Competition between networks often produces higher eCPMs.
Is Waterfall Advertising Obsolete?
No, but bidding-based mediation is becoming the industry standard.
Does Mediation Slow Down Apps?
Generally no. Modern mediation platforms are optimized for speed.
Is AdMob Mediation Free?
Yes. Google does not charge additional fees for mediation itself.
Which Option Is Better for Most Apps?
In 2026, AdMob Mediation with bidding usually delivers the best balance of revenue, fill rate, and scalability.
Final Verdict
Both Waterfall Ads and AdMob Mediation can generate revenue, but they are designed for different stages of app growth.
Waterfall setups offer simplicity and manual control, making them suitable for smaller projects.
AdMob Mediation provides higher revenue potential through competition and automated optimization, making it the preferred choice for serious app publishers.
For most Android and Unity developers, enabling AdMob Mediation with bidding partners is the best strategy to maximize earnings in 2026.
