Multi-touch attribution (MTA)

What is Multi-touch attribution (MTA)?

Multi-touch attribution (MTA) is an attribution methodology that distributes conversion credit across multiple touchpoints in a user's journey, rather than assigning all credit to a single interaction. It recognizes that users typically engage with several ads across different channels before converting. MTA provides marketers with a more complete picture of how each channel contributes to a final conversion event.

How it works

Multi-touch attribution works by tracking every ad interaction a user has before converting, then applying a mathematical model to distribute credit among those touchpoints.

Tracking the User Journey

A mobile measurement partner (MMP) records each impression, click, or engagement a user has with ads across channels. These interactions are logged as touchpoints along the conversion path. For example, a user might see a display ad on one channel, click a retargeting ad on another, and finally convert through a search ad on a third channel. All three interactions are captured and associated with that user's journey.

Distributing Conversion Credit

Once the journey is complete and a conversion occurs, the MTA model calculates how much value to assign to each touchpoint. Different MTA models apply different rules for this distribution.

Common MTA Models

Linear attribution distributes conversion credit equally across all touchpoints. If three channels were involved, each receives one-third of the credit.

Time decay attribution assigns more credit to touchpoints that occurred closer to the conversion event, on the premise that recent interactions had greater influence.

Position-based attribution (also called U-shaped) allocates more credit to the first and last touchpoints, with the remaining credit split among middle interactions.

Data-driven attribution uses machine learning to assign credit based on the actual statistical contribution of each touchpoint, rather than a fixed rule. This model requires sufficient conversion volume to produce reliable results.

Role of the MMP

An MMP sits at the center of MTA by ingesting signals from multiple ad networks, attributing each touchpoint to the correct campaign and channel, and delivering unified reports. This cross-channel visibility is what makes MTA actionable. Without a centralized measurement layer, data from different networks cannot be reconciled into a single user journey.

Why it matters

Single-touch attribution models, particularly last-touch attribution, systematically overvalue the final channel a user interacted with and ignore the channels that drove awareness and consideration. This creates a distorted view of channel performance that leads to misallocated budgets.

MTA corrects this distortion by surfacing the contribution of every channel. Channels that drive early-funnel awareness, such as display or video, often appear to underperform under last-touch models. MTA reveals their true role in initiating and nurturing the user journey, particularly in longer or more complex conversion paths that involve several touchpoints before the final action.

For budget optimization, MTA enables marketers to invest in channels proportional to their actual contribution rather than their proximity to conversion. This improves overall campaign efficiency and reduces the risk of defunding channels that deliver real value earlier in the funnel.

MTA also provides the granular data needed to optimize creative, targeting, and sequencing decisions. Marketers can identify which combinations of touchpoints produce the highest conversion rates and design campaigns accordingly.

How to measure multi-touch attribution

1. Define your conversion events

Before setting up MTA, identify the conversion events you want to measure. These typically include installs, registrations, purchases, or other in-app events that represent meaningful user actions. Clear conversion definitions ensure attribution credit is distributed with respect to the outcomes that matter most to your business.

2. Choose an MMP with cross-channel tracking

Implement an MMP that can ingest touchpoint data from all of your active ad networks and channels. The MMP's SDK or server-to-server integration captures impressions, clicks, and conversion events across the full user journey. Airbridge, for example, uses a last-touch attribution model but offers a Touchpoints Analysis report that shows how many touchpoints preceded each conversion, letting you gauge how much of your traffic reflects multi-touch journeys even without switching to an MTA credit model.

3. Select an attribution model

Choose the MTA model that aligns with your marketing goals. Linear and position-based models are straightforward to implement and interpret. Data-driven models offer greater accuracy but require sufficient conversion volume to function reliably. You can run multiple models in parallel to compare results before committing to one.

4. Set attribution windows

Configure view-through and click-through attribution windows that reflect realistic user behavior for your product category. Windows that are too long capture irrelevant touchpoints; windows that are too short miss meaningful interactions.

5. Analyze and act on channel contributions

Review MTA reports to understand the credit distribution across channels. Identify channels that consistently contribute early in the funnel versus those that close conversions. Use these insights to adjust budget allocation, refine targeting, and optimize the sequencing of ad formats across the user journey.

6. Validate with incrementality testing

MTA models rely on correlation rather than causation. Complement MTA with incrementality testing or holdout experiments to confirm that the channels receiving credit are genuinely driving conversions, not just present in the path.

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