S2S Postbacks Explained: How to Track Your iGaming Campaigns Like a Pro

Tracking is everything in performance marketing. If you run casino or sports betting campaigns, understanding S2S (server-to-server) postbacks can be the difference between a profitable campaign and a money pit. Without them, you're optimising blind: you see clicks, but not the registrations and first deposits that actually pay.

In this guide, we break down what S2S postbacks are, how they work, and how to use them properly in iGaming. We'll also show how Traffic Nomads lets you track separate events, like sign-ups and deposits, so you can optimise on the numbers that matter and scale faster.

What are S2S postbacks?

S2S (server-to-server) postbacks are a method of conversion tracking where the operator, affiliate network or tracker tells the ad platform about a conversion directly, server to server, without relying on browser cookies or pixels.

Unlike pixel tracking, S2S postbacks are more accurate, cookie-less and well suited to mobile traffic and to campaigns where privacy settings block third-party cookies. That matters in iGaming, where most play happens on phones: mobile devices generated 58% of European online gambling revenue in 2024, according to EGBA.

How do S2S postbacks work?

Each time a user completes a tracked action (like registering or making a deposit), the following happens:

1. The click is recorded by your tracker with a unique click ID.
2. That ID is passed to the affiliate network or operator with the click.
3. When the user completes an action, the operator records the event against that ID.
4. The affiliate network or operator fires a postback to your tracker.
5. Your tracker fires a postback to the ad platform (like Traffic Nomads).
6. The conversion appears in your campaign dashboard, tied to the right source, GEO and device.

Why should you use S2S postbacks in iGaming?

S2S postbacks are essential for serious media buyers. Here's why:

• Accuracy: no reliance on browser cookies or pixels
• Mobile friendly: ideal for mobile and app-based funnels
• Real-time optimisation: data arrives fast enough to adjust bids and creatives
• Multiple event tracking: track more than one event per funnel, from registration to first deposit
• Late conversions: deposits that arrive days after the click still get credited to the right source

In iGaming, the last point is critical. A registration can happen minutes after the click, while the first deposit may come days later. Our guide to tracking an iGaming funnel when the conversion arrives a week late explains how to handle that lag.

How does Traffic Nomads track sign-ups and deposits?

At Traffic Nomads, we know that affiliates and operators need more than one conversion event. In casino and betting, the real ROI happens after the user signs up.

That's why the platform lets you track separate conversion events via S2S postbacks:

• Event 1, sign-up: see how many users registered after clicking your ad
• Event 2, deposit: see which users went on to deposit and generate revenue

This separates lead quality from revenue-generating behaviour and lets you optimise on real performance, not surface-level metrics. It is also what powers FTD Magnet AI, which optimises campaigns toward first-time deposits instead of clicks.

How do you set up S2S postbacks on Traffic Nomads?

Setting up postbacks on the platform is simple:

1. Create your campaign and make sure your tracker supports postback URLs.
2. Copy the postback URL from the campaign settings, located under the Ad URL field.
3. Configure the postbacks in your tracker. If possible, set up two: one for sign-up and one for deposit.
4. Ask for a test. Contact support or your account manager for a test link, and fire a test conversion.
5. Check your dashboard to confirm both events are tracked against the right campaign and SubID.

What does a postback URL look like?

A postback URL is a web address your tracker or affiliate network calls when a conversion happens. At minimum it carries the click ID that Traffic Nomads passed with the original click, so the conversion can be matched to the right campaign, publisher and creative. It starts like this:

https://node2.trafficnomads.com/conv/?clickid={clickid}

The part in curly brackets is a macro: your tracker replaces it with the real click ID when it fires. Each campaign has its own postback URL, including the parameters for separate events such as registration and deposit. Always copy it from the campaign settings, under the Ad URL field, rather than building it by hand.

Which trackers support S2S postbacks for iGaming?

All the trackers commonly used by iGaming media buyers support S2S postbacks, including Voluum, Binom, Keitaro and RedTrack. The workflow is similar in each:

1. Add Traffic Nomads as a traffic source and map its click ID macro.
2. Add the operator or affiliate network as an offer source, and pass your tracker's click ID to it.
3. Paste the Traffic Nomads postback URL into the traffic source settings.
4. Map each conversion type (registration, deposit) to the right event.

If you work directly with an operator without a tracker, the operator's affiliate platform can usually fire the postback to Traffic Nomads directly.

How does postback data improve campaign optimisation?

Once events flow back in real time, you can make decisions that are impossible with click data alone:

• Cut publishers early that produce registrations but no deposits
• Raise bids on zones and creatives with the lowest cost per FTD
• Compare formats (pop, push, in-page push, native, banner) on deposits, not CTR
• Feed automated optimisation, so tools like SmartBid and FTD Magnet AI work toward the goal you actually pay for

Without postbacks, every one of those decisions is a guess.

What are the most common postback mistakes?

• Firing the deposit postback on registration. The algorithm then optimises toward sign-ups, not depositors.
• Missing the click ID macro. Without it, conversions can't be matched to clicks.
• Not passing SubIDs. You see conversions but can't tell which publisher or creative produced them. See our guide to SubID tracking.
• Never testing. Always fire a test conversion before the campaign spends real budget.
• Duplicate postbacks. Make sure each event fires once, or your conversion rate will look better than it is.

Which events should an iGaming funnel track?

Final thoughts: start tracking like a pro

S2S postbacks are a must for any serious affiliate or media buyer in 2026. With Traffic Nomads, you're not tracking just one event: you get sign-ups and deposits, per source, so you can make smarter decisions and grow your ROI.

Ready to set up your postbacks?