When running mobile ads, it’s important to understand the three main bidding models: CPA Goal, SmartCPM, and CPM. Knowing how they work will significantly increase your chances of finding a winning campaign early on.
This is core knowledge for anyone doing CPA affiliate marketing—especially if you want to scale campaigns, optimize your budget, or simply stay profitable in the long run.
This article is adapted from a video I shared in my course. You can use it to better understand the concepts, or keep it as a reference whenever you set up a new campaign on PropellerAds.
CPA Goal – Automated Optimization for Conversions
CPA Goal is an automated bidding model from PropellerAds. They often describe it as “AI-powered,” but in reality, it’s simply a set of pre-defined algorithms designed to help you optimize your cost per conversion (CPA).
How Does CPA Goal Work?
You simply set a target CPA—meaning how much you’re willing to pay for each conversion.
For example:
- The offer you’re promoting pays $1 per conversion
- You want a 50% profit margin → so you set your CPA Goal at $0.5
From there, the system will automatically run your ads and try to keep your cost per conversion at $0.5 or lower.
If the system detects profitable Zone IDs, it will increase the CPM bid on those zones to bring you more traffic (and more profit—both for you and for PropellerAds).
On the other hand, if certain Zone IDs are not performing well, it will lower the CPM bid to reduce traffic. In some cases, it may even stop traffic from those zones entirely.
Here’s another example:
If I’m promoting an offer that pays $0.30 per conversion, I would typically set my CPA Goal at $0.15. If the system optimizes well, I’m making $0.15 profit per conversion.
PropellerAds recommends setting your CPA Goal at around 70–80% of the payout, but I personally never do that. Here’s why:
- You lose about 3% when depositing funds
- Another 3% when withdrawing
- And around 3% more when transferring to your bank (at least in my case, based in Vietnam)
That’s close to 10% lost in transaction fees.
So if you’re running ads with a CPA set at 80% of the payout, you’re basically breaking even—or worse.
That’s why I usually aim for around 50% of the payout to maintain a healthy margin.
In some cases, when scaling aggressively, I might push the CPA up to 70% to dominate traffic from high-performing Zone IDs.
When Should You Use CPA Goal?
CPA Goal works best when you want the system to handle optimization for you with minimal manual effort.
It’s especially useful during the testing phase—when your goal is to control costs and quickly identify a profitable campaign (or cut losses early if it’s not working).
One downside, however, is that CPA Goal usually delivers limited traffic. At the beginning, the system tends to send you the best traffic first to generate conversions quickly and gather data for optimization.
But over time, performance often declines.
This happens because of saturation. The system doesn’t account for ad fatigue. If a Zone ID is profitable, it will keep pushing traffic from that same source continuously—because it benefits both you and the platform.
The result:
Your ads get shown more frequently, but the quality drops, and conversions start to decrease.
To handle this, you can schedule your campaigns to run only during specific hours instead of running them 24/7. More importantly, once you identify your top-performing Zone IDs, you should extract them and create separate SmartCPM campaigns for better control and scaling.
Another limitation of CPA Goal is when you’re promoting high-payout offers (which means a higher CPA target). In these cases, optimization becomes harder because conversions are less frequent.
And the fewer conversions you have, the less data the system can use—making optimization less effective overall.
SmartCPM – Smart Bidding with Better Cost Control
SmartCPM is the most commonly used bidding model on PropellerAds. From my experience, it’s also the most flexible and reliable option for CPA marketers—especially during the testing phase of a campaign.
How Does SmartCPM Work?
With SmartCPM, you set a maximum bid per 1,000 impressions (CPM)—for example, $6. But the system won’t actually spend the full $6. Instead, it automatically adjusts your bid just enough to beat competitors at each auction.
That might sound a bit abstract, so here’s a simple way to think about it:
Let’s say you set your bid at $6 CPM (which equals $0.006 per impression).
- A competitor bids $0.0008 per impression
→ SmartCPM raises your bid slightly to around $0.0009, just enough to win - Another competitor bids $0.003 per impression
→ The system increases your bid to around $0.0031 so you can outbid them
In short:
You set a high ceiling, and PropellerAds handles the micro-adjustments to ensure you win traffic at the lowest possible cost.
Another advantage of SmartCPM is that you can use it to estimate traffic volume on PropellerAds.
For example, you can set up a campaign targeting a GEO like Pakistan, choose SmartCPM, and the system will show you an estimated number of impressions. Their interface makes this very easy to visualize.
If a GEO has very low traffic, you can simply skip it—because even if it’s profitable, the scale will be too limited to matter.
When Should You Use SmartCPM?
You can use SmartCPM in several key situations:
1. Discover high-quality placements
Since your ads are distributed across many websites, SmartCPM allows you to test broadly and identify which placements are actually profitable.
2. Improve cost efficiency
Compared to using a fixed CPM (manual bidding), SmartCPM helps you avoid overpaying for traffic. The system automatically adjusts your bid, so you only pay what’s necessary to win each impression.
You can also control frequency capping. For example, you might limit your ads to show only once per user every 24 or 48 hours. This helps reduce ad fatigue and keeps your campaign performing longer.
3. Placement domination strategy
When I have a strong campaign with scaling potential, I often try to “take over” the best placements. In this case, I set a high bid cap (for example, $10 CPM) to ensure my ads get priority delivery.
Then I analyze which placements are profitable and optimize or scale from there.
Tip:
If you’re confident your offer converts well, don’t be too conservative during testing. Spend a bit more to gather enough data quickly. Once you’ve identified the best placements, you can switch to manual CPM bidding for tighter cost control.
CPM – Manual Bidding, Paying for Position
If CPA Goal is about handing everything over to the system, and SmartCPM is about bidding intelligently, then CPM is the most straightforward approach: whoever bids higher gets the traffic, and whoever bids lower gets left out.
What Is CPM?
CPM (Cost Per Mille) means you pay for every 1,000 impressions. Whatever bid you set is exactly what you’ll pay—there’s no automatic adjustment, no optimization layer.
For example:
If you bid $0.001 per 1,000 impressions and a competitor bids $0.002, your ads will lose the auction and get little to no traffic. But if you’re the highest bidder, you win the placement. Simple and direct.
Advantages of CPM
- Full control: You always know exactly how much you’re paying per 1,000 impressions
- Great for proven placements: Once you’ve tested and identified high-performing Zone IDs, CPM is perfect for locking in those spots and maintaining stable traffic
Downside: The main drawback is that CPM doesn’t optimize costs like SmartCPM. You always pay your full bid—even in situations where you could have paid less due to low competition.
When Should You Use CPM?
CPM is best used when you already know exactly which Zone IDs are performing well—and you want to secure those placements long-term.
It’s also a strong choice when you want to scale aggressively and focus your budget on proven traffic sources, or when you need full control over spending without relying on automated optimization.
On PropellerAds, these are called Zone IDs, but the general term is placements. On other platforms, you might see names like Site ID—they all refer to the same concept.
A common question is:
If SmartCPM is more advanced, why does CPM still exist?
The answer is simple—priority access.
With CPM campaigns, you often get access to the top ad positions first. And those top positions usually deliver the best traffic quality and highest conversion rates.
Conclusion
In CPA affiliate marketing, understanding bidding models isn’t just basic knowledge—it’s a key factor in saving money and, more importantly, maximizing your profits.
Each bidding option on PropellerAds has its own strengths and weaknesses. There’s no “one-size-fits-all” solution—only the right choice for each stage of your campaign.
If you’re still unsure, I recommend going through the sections above again and making sure you fully understand these three models. In the next video, I’ll show you how to choose the right bidding strategy for real-world scenarios—whether you’re testing offers, scaling campaigns, or working with a limited budget.
See you in the next part.