MTA incrementality signals in partner postbacks

The partner visibility gap in last-click attribution

For years, ad networks have been flying blind. When a partner’s click drove a user to the app but didn’t win its attribution, the network had no way to know about it. Was the user uninterested? Was the creative off? Or did another partner simply capture the final click, even though the network drove a meaningful touchpoint earlier in the journey?

The result is an ecosystem where almost every bidding and optimization algorithm is trained exclusively on last-click outcomes. Networks that drive real incremental value are systematically undervalued by their own optimization systems. The signal they need to learn from isn’t there.

What postback macros has Singular added?

Singular has released two new install macros, now available in every partner postback:

• single_attributed=true/false: flags installs where the partner was the only touchpoint in the user journey. This is a strong signal of incremental value at the user-level.
• assist=true/false: flags general install postbacks where the partner had a touchpoint but didn’t win last-click attribution. The partner still influenced the conversion; they just weren’t the final step.

Together, these signals give networks something they’ve never had before: a clear, real-time view of where they’re driving unique audiences, where they’re contributing assists, and where their impact has been hidden by last-click methodology.

Here’s what a partner postback looks like with the new macros in place:

https://partner.example.com/postback?event=install
  &app=com.example.app
  &clickid=abc123
  &single_attributed=true    ← NEW
  &assist=false              ← NEW
  &install_time=1729612800

What the data shows

• 94% of Meta’s attributed installs were single-attributed: no prior touchpoints from other channels
• Up to 29% additional assisted installs on top of last-click volume: value that was there all along but invisible to partners optimizing against last-click alone

Applied across the analysis, MTA surfaced up to 50% higher ROAS than last-touch. Not because MTA inflates performance, but because it reallocates credit to channels that last-click systematically undervalues.

The pattern isn’t limited to Meta

Singular’s MTA framework applies across every channel partners work with, and the numbers look different depending on where a network sits in the user journey. Intent-capture channels (search, for example) often look strong under last-click because they appear at the final moment before conversion. Discovery-driven platforms influence users earlier in the funnel, which is exactly where last-click buries contribution.

Our Q4 2025 analysis of Snapchat performance illustrates the point:

• 84% single-attributed install rate: unique audience reach, well above the 30–80% range most mobile ad channels show
• 51% assist rate: for every 10 installs directly attributed to Snap, it also assisted roughly 5 more that other channels closed
• 20% higher ROAS under MTA than last-touch, once the full journey is credited

Together, these patterns show up formally in the Singular ROI Index 2026, which now includes dedicated MTA leaderboards across three metrics: Exclusive Reach (unique audience delivery), Assist Power (journey influence without last-touch credit), and MTA Uplift (the gap between last-touch and multi-touch measured contribution). 

This is the industry frame the new postback macros plug into.

• {single_attributed=true} is the signal behind Exclusive Reach
• {assist=true} is the signal behind Assist Power.

Together they give partners the same visibility advertisers already use to read these leaderboards.

Why this matters for partners

With Singular’s new postback signals, networks can:

• Identify and double down on unique inventory. Partners with a high rate of single-attributed installs are reaching audiences no other channel is touching: a measurable signal of incremental value that deserves more budget, not less.
• Surface channel overlap and optimize for differentiation. Networks seeing many assists but few last-click wins can rethink bid strategies, segmentation, or creative approach to capture more closing conversions.
• Train smarter optimization algorithms. When models can see why they didn’t win, and when they drove genuine incremental lift, the entire feedback loop gets smarter. Optimization stops rewarding recency and starts rewarding real contribution.

“Last-click attribution has been the default for a decade, but it doesn’t give networks the full picture of the value they drive. By surfacing assist and single-attributed signals directly in partner postbacks, we’re giving networks the data they need to move past last-click thinking and start optimizing for the outcomes that actually drive growth: incremental audiences and true channel value.”
-Eran Friedman, CTO & Co-Founder, Singular.

Why this matters for advertisers

Advertisers don’t just benefit indirectly. They benefit materially. Here’s what changes:

• Better partner conversations. When your media partners can see their own assist and single-attributed rates in the postbacks you send them, QBRs shift from “did we hit last-click ROAS?” to “which partners are actually driving unique audiences?” You gain a shared language and a shared data source for scaling the networks that deserve it.
• Smarter scaling across every channel where last-click misattributes value.With assist and single-attributed signals flowing back to networks, your partners finally have the data they need to help unlock lift that last-click has historically buried.
• A healthier partner ecosystem where networks are rewarded for the value they actually deliver, not just the clicks they happen to win. Partners optimizing against incrementality signals means their algorithms get smarter on your campaigns, automatically.

Built on Singular’s Assists and MTA foundation

“Measurement and activation need to work as one system,” said Friedman. “Assists gives advertisers clear visibility into channel overlap and incremental lift. Extending those signals into partner postbacks puts the same intelligence in the hands of the networks, so the entire ecosystem can optimize with better data.</em>”

Move beyond last-click. Start optimizing for multi-touch incremental value.

Surfacing these signals requires unified measurement and activation working as one system: measurement that sees the full journey, activation that feeds it back to partners in real time.

For the advertisers who already rely on Singular for Advanced Attribution, it’s the natural next step in how the platform closes the loop between measurement and activation: an ecosystem where last-click stops being the ceiling on optimization and becomes just one data point in a far richer picture.

Learn more

For partners:
→ Postback Macros and Passthrough Parameters for Ad Networks

For advertisers:
→ Understanding Assist MTA Attribution
→ Assist and Install MTA FAQ
→ Singular ROI Index 2026