August 4, 2017 | Business | by Christopher Hendrickson

Ads.txt Overview – A Simple Solution to a Complex Programmatic Issue?

This spring, The Interactive Advertising Bureau rolled out ads.txt to improve transparency in programmatic advertising. The initiative gives content owners a way to declare who is authorized to sell their inventory. But ad tech professionals are divided. Supporters of the project say that it is a simple and elegant solution, while some critics argue that it is not the panacea that some believe it to be. Let’s explore those perspectives.


What Is Ads.txt?

Ads.txt is a low-tech solution to a complex issue. It draws inspiration from robots.txt, where plaintext files are posted on the root domains of publishers to prove that the publisher themselves authored the file. This creates a very simple and secure method for publishers to declare who is authorized to sell their inventory, giving publishers the ability to help buyers by improving transparency.

Why Do We Need Ads.txt?

Although programmatic advertising can result in major improvements in revenues and advertising performance for all parties, the automatic nature of the process can open up the opportunity for fraudsters to benefit. Domain spoofing is one of the popular methods that fraudsters use to trick buyers into purchasing misrepresented inventory that will never reach a real audience. Ads.txt is an attempt to fix this.

How Does Ads.txt Work?

Publishers host a plaintext list of the ad exchanges that they work with on their website. Buyers can use web crawlers to find these files and ensure that they are purchasing inventory only through the appropriate exchanges. This means that spend goes to the appropriate publishers while buyers can be confident their ads will reach the desired audience.

Why Do Some Support Ads.txt?

The high-profile increase in programmatic fraud in recent years meant that a viable solution desperately needed to be found. For many, ads.txt represents a step in the right direction. It is a collaborative effort from the industry, and many consider it to be a cost-effective, simple, and elegant method capable of tackling the issue of fraud in programmatic advertising.

Why Are Some Against Ads.txt?

While some in the industry believe that ads.txt represents a great start, they still believe there are issues which mean ads.txt will not succeed. First among those issues is the fact that the success of the ads.txt solution relies upon widespread adoption among publishers. Some critics believe that publishers will be uncomfortable sharing information about the exchanges that they work with, thereby damaging the ads.txt initiative.

Secondly, ads.txt does not currently differentiate between the type of ad space that publishers are selling. This is considered to be a major weakness that still leaves the door open for fraudsters looking to sell fraudulent inventory.

What Is Next For Ads.txt?

Increased adoption
Adoption among publishers is critical to the success of the ads.txt project, and we believe that the adoption rate will continue to increase over time. The incentives for premium publishers to adopt are clear: they will want buyers to be comfortable and confident when purchasing their inventory, and for ad spend to go to them. As awareness of the project continues to grow, we can predict that adoption will increase too.

Accommodation for Ad Formats
Future iterations of ads.txt will implement a method for publishers to signal what type of inventory they are selling on exchanges. This will further reduce fraud, where in some instances the type of inventory being sold is intentionally misrepresented by fraudsters.


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