Measurement has always lagged behind the channel, but AI has widened the gap and it is now affecting whether an affiliate gets paid or not, writes Nick Beck from Tug Agency.
An AI agent doesn’t browse. It queries a catalogue, weighs a few options against your stated budget, and either buys or tells you where to buy. Either way, a decision gets made before you ever see a page.
This isn’t a thought experiment. Google’s Universal Commerce Protocol went live at the National Retail Federation (NRF) in January, letting agents pull merchant catalogues and transact directly. Microsoft shipped Copilot Checkout the same month. OpenAI tried full in-chat purchasing with Instant Checkout, then walked it back in March. Chat recommends now.
The merchant’s own site closes the sale. Visa, Mastercard and Amex have all built agent-specific payment rails in the past few months. Nobody is waiting to see if this happens. It’s happening.
The part that should worry the performance marketing industry isn’t that agents buy things. It’s that agents refer things. A comparison site, a review, a creator’s link, that’s who used to send the click and got paid for it.
Now the agent does the comparing. The agent decides where the referral lands. Your tracking infrastructure was built for a browser having a session, not a model making a recommendation.
The technical hurdle
I’ve spent a chunk of my career arguing that measurement in this industry lags the channel by about two years. This is the fastest I’ve seen that gap open. The infrastructure to route billions in commerce through agents already exists. The infrastructure to work out who gets credited for it does not.
Even if we fix attribution, a massive technical hurdle remains: confirmation and validation protocols. In traditional affiliate media, verifying a valid sale versus a returned or fake one was already messy.
In an agentic world – where confirmation might be an API log or a voice recording – who acts as the gatekeeper?
Establishing transparent protocols to validate transactions before payouts happen was the main friction point when voice assistants launched, and it remains the biggest unresolved question in agentic commerce today.
Here’s what actually matters. Being persuasive to a human and being selectable by an agent are not the same skill. Most of the industry is still optimising for the first one.
An agent doesn’t read your homepage copy. It reads structured data, machine-readable pricing, an API with a clean schema. Search once rewarded being findable by a person. It now rewards being callable by a machine.
Get that wrong and you don’t lose the click. You were never in the conversation the agent had with itself before it decided.
Proving value without the click
Measurement has to catch up too, agents or no agents. You cannot A/B test a purchase that happened inside someone else’s chat interface, nor can you attribute a purchase to a click that never occurred.
What you can measure is what would have happened anyway – top-line baseline sales versus total incremental lift. This is where holistic approaches like Tug’s real impact framework and media mix modelling (MMM) become essential. Because true incrementality never needed a user-level click to attach to, it bypasses the AI black box entirely to prove real business growth.
None of this is unique to affiliates. Every part of paid media built on session-based tracking is walking into the same wall. Affiliate feels it first, because affiliate’s entire economic model is a bet that you can trace a purchase back to the party who influenced it. That bet still holds. The mechanism for collecting on it doesn’t, not in its current form.
Twenty years of this industry were spent perfecting the click. The next few will be spent proving value without one, while agents quietly take over the referral decisions publishers used to make themselves.
Nobody has fully solved this yet. The businesses that start solving it now, instead of defending a model the agents have already routed around, are the ones who get paid.
Nick Beck is the chief executive and founder of Tug Agency.
