CPA Tune: AI Optimization & Automated Bidding

Introduction
How CPA Tune Works
Enabling CPA Tune
Best Practices on CPA Tune for Product Campaigns
Best Practices on CPA Tune for Search Feed Campaigns
FAQ

Introduction

CPA Tune is MGID’s AI-powered, automated bidding algorithm, designed to help you achieve more conversions at your target cost-per-acquisition (CPA). It dynamically adjusts bids using real-time and historical data to win impressions that are most likely to convert.

While you will still pay per click, the optimization focus shifts from clicks to conversions. The aim here is to hit the target CPA on average with a positive ROI. 

CPA Tune includes Target CPA and MaxConversions bidding strategies.

We recommend using CPA Tune:

• For a performance-focused advertiser whose key goal is conversions with a fixed CPA goal;
• If you seek to automate bidding with a certain CPA KPI or are already using CPA strategies on other platforms;
• Brand clients seeking to allocate the campaign budget to maximize conversions (MaxConversions).

How CPA Tune Works

Data guides conversion prediction — not guesswork. 

The model bids only when the algorithm predicts a medium to high probability of conversion.

Dynamic CPC adjusts bids in real time.

Using conversion predictions, competitive landscape analysis, user context and behavioral patterns, CPA Tune ensures budgets are directed to the most promising traffic.

Optimization is continuous and automated.

The CPA bidding strategy remains a CPC-bidding model that aims to achieve a specific target CPA. The algorithm automatically explores new opportunities and fine-tunes delivery to hit the given CPA goal. The model starts at a higher-than-average CPC to acquire relevant traffic as quickly as possible and transition into the optimization phase.

Let’s review each strategy.

Target CPA

Target CPA strategy is designed to help you achieve or outperform your desired cost per acquisition (CPA).  When Target CPA is enabled, the system initially places higher bids to generate sufficient traffic and collect data for optimization. This early exploration phase helps the algorithm better understand which traffic sources are most likely to convert.

During this period, campaign spend and actual CPA may fluctuate. This is expected behavior, as the algorithm continuously balances two objectives: generating enough volume and aligning performance with the target CPA.

The target CPA set by the advertiser is the primary control lever for bidding, guiding the algorithm in optimizing campaign performance.

Success with this strategy means maintaining the advertiser’s factual CPA as close to the target CPA as possible on average and ensuring a positive return on investment.

MaxConversions

MaxConversions strategy focuses on maximizing the total number of conversions while fully utilizing your daily budget. When Max Conversions is enabled, the target CPA serves as a directional bidding benchmark and helps reduce the exploration phase. This strategy spends the allocated budget and aims to generate as many conversions as possible. This is a hybrid approach that combines the control of traditional Target CPA with the scale of a pure MaxConversions model.

Budget Requirements:

To ensure stable performance and effective optimization, campaigns need a sufficient budget relative to the target CPA:

• For product campaigns, the budget must be at least 5× tCPA.
• For search feed campaigns, the budget must be at least 30× tCPA.

These minimum thresholds allow the algorithm to collect enough data and optimize bidding more accurately.

The campaign budget is the primary lever of bidding control for the advertiser within this strategy.

CPA Tune requires setting up conversion tracking for the main goal, at least. CPA Tune was designed to optimize towards the main conversion goal.

Enabling CPA Tune

Before you proceed, please note that we require self-registered advertiser accounts to have a minimum of $650 in their account in order to access CPA Tune in the dashboard.

To enable CPA Tune in MGID Ads, follow these steps:

1. During campaign setup, open Budget and limits. Under the Bidding strategy, select Target CPA or MaxConversions to activate CPA Tune.

2.  Add a realistic target CPA (tCPA).

• As an affiliate, consider the payout for a successful conversion in your network to estimate a comfortable target CPA.
• As a product owner, set the maximum amount you’re willing to spend to acquire one conversion.

Also, please take a look at the best practices listed below.

3. Allocate a daily budget that is at least 5-7x tCPA to capture enough conversions during one day. Or keep it unlimited.

4. Keep targeting settings broad enough to allow volume.

5. In Conversion tracking, enable at least the main conversion goal (consider additional goals to diagnose the funnel better and optimize accordingly).

Switching Between Manual Bidding and CPA Tune

You can switch between Manual Bidding and CPA Tune at any time using the radio buttons in the “Budget and Bidding” section when editing your campaign.

There are no limits on how often you can change the bidding strategy. However, once you select a different strategy, you will need to update the related settings required for that option.

Best Practices on CPA Tune for Product Campaigns

To get the most out of CPA Tune for product campaigns, follow these key recommendations.

• Set a realistic CPA target

Start with a CPA target that’s around 20% higher than your ideal tCPA. This gives the algorithm flexibility during the learning phase and helps prevent premature bidding restrictions that can limit scale. 

• Use the main control levers to guide bidding performance

Target CPA: the primary lever is tCPA. A higher target CPA gives the algorithm more flexibility to bid higher and capture additional conversion opportunities, while a lower tCPA makes bidding more conservative.

MaxConversions: the primary lever is the campaign budget. Increasing the budget allows the algorithm to generate more conversions by expanding reach and traffic volume.

• Set a sufficient daily budget

Aim for 5–7x your CPA target. A higher budget ensures enough conversions, which gives the algorithm more opportunities to learn and optimize faster.  We suggest slightly increasing daily limits, in the event they are not achieved initially. Increasing daily limits will prevent the advertising campaign's breaking mechanism from blocking the model's ability to reach the initially expected daily limit.

• Limit creative ads to 10 or fewer

The algorithm performs best with a limited set of ads — ideally 10 or fewer. Consider pausing underperforming ads and uploading new ones to maintain effectiveness.

• Add new creatives (after the exploration phase)

Refresh creatives periodically to unlock new pockets of traffic. This gives the algorithm a chance to explore opportunities again.

• Enable multiple conversion tracking steps in the funnel

Setting the main conversion goal is required. However, tracking additional conversion events across the funnel (top, mid, bottom) gives the algorithm richer data to work with. Additional events can highlight performance issues and help in basic manual optimization.

• Configure sources optimization

Allow more potentially relevant sources and adjust along the way, unblock sources if you switched from CPC.

• Avoid narrow targeting settings

 Broader targeting settings ensure there is enough volume, giving the model space to explore.

• Allow a learning period of 7-14 days

The algorithm starts with the exploration phase and begins optimizing after getting at least one conversion. Predictions get better after 10-30 conversions. Let the algorithm run for 7–14 days without major changes to your budget, targeting or creatives. The stability helps the algorithm optimize effectively.

• Explore strategies

Start with CPC, then switch to CPA Tune. Switch between Target CPA and MaxConversions to balance volume and fact CPA.

Best Practices on CPA Tune for Search Feed Campaigns

To get the most out of CPA Tune for search feed campaigns, follow these key recommendations.

• You don't have to handle the buyout

The model handles the buyout process automatically for search feed campaigns — no manual steps required.

• Optimize ad creatives and CPA target

Monitor ad creatives: remove low-performing ones and add new ones. Keep no more than 10 ad creatives in active status.

Control the fact average CPA (payout). Set the target CPA 15–20% lower than the actual.

• Manage the budget during the campaign launch
  

Let the first $200–300 run at break-even or even at a small loss. Set a daily limit to around 200x tCPA.

In the first few days, ensure continuous delivery throughout the entire day, without pauses due to lack of budget, to study the full daily cycle.

• Understand target CPA accuracy

Target CPA accuracy is a guideline for the model, not the exact cost per conversion. The model may not meet your exact target (for example, if you set 0.5, it comes out as 0.4). MaxConversions target overspend is limited by 2x tCPA.

• Apply ongoing campaign adjustments

Check the campaign 1–2 times per day.  If the margin is high enough, you should increase the target CPA/budget (Target CPA/MaxConversions).  If the margin is low, you should decrease the target CPA/budget (Target CPA/MaxConversions).

FAQ

1. Is CPA Tune a new pricing model?

No. Campaigns are still billed on a CPC basis. CPA Tune is a set of AI-powered optimization strategies that adjust CPC bids in real time with the goal of achieving your target CPA. You pay for clicks, but the system decides which clicks to buy based on predicted conversion probability.

2. How does CPA Tune decide when to bid?

Each impression is analyzed based on historical performance and real-time factors such as device, location, context and user behavior. The system then estimates the probability of conversion and automatically adjusts the CPC bid. This way, your campaign avoids wasting budget and instead invests in the most promising opportunities backed by data.

3. Which campaign types support CPA Tune?

CPA Tune is currently available for product campaigns and search feed campaigns.

4. Can I manually adjust CPC bids in a CPA campaign?

No, you cannot manually adjust CPC bids in a CPA campaign. Once CPA Tune is activated, manual CPC controls are disabled, as the algorithm requires full autonomy to optimize bidding toward your target CPA. Instead, you can influence bidding by adjusting your CPA target.

5. Can I change my target CPA after launch?

Yes, you can update your target CPA after launch. However, it’s best to avoid doing so during the learning phase (the first 7–14 days or until the campaign collects about 10–30 conversions). Target CPA is your main control lever.

6. What happens if my CPA target is set too low?

If your target is unrealistically low, the system may struggle to buy traffic and deliver conversions. We recommend starting with a CPA target around 20% higher than your actual goal to give the algorithm room to learn and then gradually optimizing downwards.

7. How much budget do I need to run CPA Tune?

To work effectively, the daily budget should be at least 5–7× the CPA target. For example, if your target CPA is $10, you should allocate at least $50–70 per day. This ensures the algorithm can deliver enough conversions within a given tCPA.

8. Why is my actual CPA higher than the target?

This may happen in the early phase while the system is learning. If it persists beyond the learning window, check whether:

• Your target CPA is realistic for your vertical;
• Budget allocation is sufficient;
• Conversion events are firing correctly.

Often, with enough time and data, the algorithm brings down the fact CPA to equal or below the target.

9. Do I lose control over my campaign with CPA Tune?

Not at all. With CPA Tune, you remain in full control of your campaign settings, including target CPA, budget, targeting, creatives and traffic sources. The only aspect automated is CPC bidding. The algorithm adjusts bids within the framework you define, ensuring it optimizes performance while staying aligned with your goals.

10. What should I do if the average CPC is higher than benchmarks at first?

If your average CPC is initially higher than benchmarks, don’t worry, this is expected. In the early stage, the model focuses on gathering quality traffic and conversion data. As the system learns, CPC naturally stabilizes and aligns with performance goals. MaxConversions may have a higher average CPC.

11. Why can’t I see the CPA Tune option in my account?

The CPA Tune option becomes available only after self-registered accounts have a minimum balance of $650. Once the balance is topped up, the feature will appear in your account’s interface.