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Header Bidding on AMP – A Complete Guide

AMP Header Bidding
What is RTC? How does it help you implement header bidding? And, can you use a wrapper? Let's dive in to get the answers.

Why implementing header bidding on AMP is different? 

As the consumption of content on hand-held devices continues to skyrocket, optimizing for speed has become a priority for the open web. Publishers, regardless of traffic volume, experimented with various frameworks and strategies to double/triple the page load speed on mobile. With the increasing demand, Google eventually launched ‘AMP’. Accelerated Mobile Pages (AMP), in its essence, is about changing the way publishers design web pages for mobile internet. 

While it’s great to have a common, widely-accepted framework to design faster pages, publishers are faced with a new set of problems – Audience tracking, measurement, and most importantly, monetization. As you’re here, we assume you know that monetizing AMP pages isn’t a straightforward process. Why? 

Well, AMP removes third-party JS tags from the pages and instead, uses its own library files.

So, can’t we monetize AMP pages at all? Of course, we can. But not as you monetize regular (non-AMP) pages. In this post, we’ll clear all the questions (comments are always open for more) and help you setup header bidding for AMP pages. 

Real Time Config (RTC)

AMP wouldn’t be adopted by the majority of the open web if there’s no way to effectively monetize the page views. After all, publishers wouldn’t want to trade their mobile ad revenue for incremental pageviews facilitated by Google.

Soon, AMP came up with Real Time Config, shortened as ‘RTC’ to step up AMP monetization. RTC is a simple way to call 5 different vendors to request bids within the span of a second. It allows publishers to connect to 5 different header bidding partners to monetize their AMP pages. That being said, RTC has its own limitations – making it a second choice. 

AMP RTC Setup and Working

Limitation of RTC

Demand partners:

You can use RTC, at its maximum capacity, to send bid request to just 5 demand partners. Typically, publishers would experiment with more than seven bidder partners to find the optimal setup and ensure the best possible CPMs. In fact, a Prebid study shows that page load time for ten bids vs five bids doesn’t differ as much as we think. In addition, user sync can be done for just one of the five demand partners as AMP permits only one non-visible iframe. 

page load time vs bids

Vendors:

As RTC call outs are limited, you can utilize a maximum of five vendors and that includes viewability vendor, DMP, audience tracking vendor, etc. So, you can’t send bid request to five demand partners, if you need to use DMP or a viewability vendor. 

Usability and Reporting:

To be precise, we are pushed back to an era – where a wrapper or container doesn’t exist. You need a developer to add or remove demand partners into your AMP pages, increasing the chances of errors. Further, there’ll be no dashboard or any reporting for you to analyze and optimize. 

Supported vendors:

As per AMP Project GitHub directory, only the following demand partners can be called via RTC implementation: AppNexus, APS, Criteo, IndexExchange, Lotame, Media.net, PubMatic OpenWrap, Purch, Rubicon, Salesforce, and Yieldbot. 

AMP Header Bidding

Yes, you can use a header bidding wrapper to monetize AMP pages. A wrapper can help you overcome all the limitation of RTC. From connecting to multiple demand partners to manageability to reporting, you can do it all via a wrapper interface and dashboards. Apparently, the wrapper should support AMP and use server-side bidding to run auctions seamlessly. Many prebid-based wrappers make use of prebid server to implement s2s auctions. 

So, how header bidding wrapper works with RTC?

You can define the AMP ad element and send a single call to the wrapper’s server (for instance, prebid server) using RTC. Here’s an example:

<amp-ad width=320 height=50

type=”server-type”

data-slot=”/21804848220/Parent_ad_unit/Child_ad_unit”

data-multi-size=”320×50″

rtc-config={“urls”:[“wrapper-server-url”]}>

</amp-ad>

The server then conducts the auctions (server-side header bidding) and returns the key-value targeting to the AMP runtime*. 

*AMP runtime is a piece of JS loaded in the head of every AMP page to provide the implementation for custom AMP elements (like AMP ad elements), manage and prioritize resource loading. 

The best part is, as a publisher, you don’t have to deal with any of the dev. and implementation work involved in setting up a header bidding wrapper. Of course, if you have your own wrapper and an in-house team, it’s on your head. Most managed header bidding providers will take care of the setup and implementation for you.

Now, what about ad server (Here, we refer to the publisher’s primary ad server. For instance, Google Ad Manager) setup? It’s basically the same. 

Fast Fetch

By the time, you should have heard about ‘fast fetch’. Fast fetch is an AMP feature introduced in the mid-2017 to render ads faster to the users. Fast fetch separates ad requests from the rest of the content and in fact, makes them earlier in the lifecycle of the page, as opposed to traditional ad requests where ad request and rendering are done at the same time. 

Fast fetch vs delayed fetch

Besides, fast fetch will only render ads when the ads are likely to be viewed by the user. If you’re familiar with header bidding wrapper, you can correlate this to asynchronous requests and lazy loading. 

RTC is one of the features of fast fetch.

Header Bidding Wrapper Vs RTC

Like everyone, you will be confused with which one to go with – header bidding wrapper or RTC. Unlike client-side and server-side header bidding, here the benefits of wrapper clearly precede over that of RTC.

RTC can be considered for a small publisher who would like to just get bids from a few demand partners. If you need reporting, easy manageability, and intense competition, header bidding wrapper is the one to opt-in. 

Video ads on AMP Pages

It isn’t simple to run video ads on AMP pages. The extensions were released last year and so it (video monetization) is very much in the developing phase. AMP has specific extensions to help you run both in-stream and outstream video ads. 

Instream video ads can be implemented via

– AMP Components: 

A publisher can use <amp-ima-video> extension to specify where to source the ads and where to source the video content with respective attributes. It has all the basic features including auto-play, docking on scroll, and analytics. 

– Using players integrated with AMP:

Some of the video players in the market support AMP and run in-stream ads on AMP pages. 

Outstream video ads can be rendered using the <amp-ad> element. You can check this post for more information on video ads. 

Next Steps

If you’re new to AMP monetization and want to know the best route, opt-in for header bidding wrapper. As we mentioned earlier RTC wouldn’t help you to see expected revenues typically. AMP monetization, as a whole, is still a developing feature. If you would like to experiment video ads (which we don’t recommend at this point – especially without an in-house team), start slow and scale later. 

Have more questions or need help to set up header bidding on AMP pages, we’re a message away.

Automatad Team

At Automatad, we help publishers to monetize better without hampering the user experience. Our products are live across hundreds of publishers, earning them incremental ad revenue with every passing second. You can request a free audit to get an estimated revenue uplift today.

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