Substack on October 8, 2026 set out three sponsorship formats that let brands pay to give readers access to work that normally sits behind a publisher's paywall, along with Kantar surveys to measure brand awareness, perception and consideration on large campaigns. The details arrived in an essay-style post on the company's On Substack publication, timed to Advertising Week in New York.

In Short

Substack, the newsletter platform where readers pay writers directly, wants brands to pay for readers to get free access to paid writing instead of buying classic ads. That matters because it is a new kind of sponsorship that ties the brand to the reader's subscription, which could give writers a second source of income without ads in the middle of their posts. For now it is a test with small groups of writers and brands, and there are no public prices or results yet.

An essay, not a press release

The post, titled "A new vision for sponsorships" and subtitled "On clubbing, Boston Market, and more ways to earn on Substack," was published under the News & Views section of On Substack. It carries the byline "Dan @ Substack" and is labeled a guest post. The author bio identifies him as Head of Brand Partnerships at Substack. No surname appears in the capture.

The format is unusual for a product update. More than a third of the text is a childhood memory: family "club nights" in a New York living room, '90s dance records, and takeout from the Boston Market chain that freed the family from cooking. "I was always thankful to Boston Market because of club nights," according to the post. "We didn't need to order dinner to dance, but having nothing to cook or clean made it easier."

The anecdote is the argument. Boston Market never interrupted anything, in the author's telling; it made the evening possible. From there the post builds its definition of a sponsorship. "An ad grabs you by the collar; a sponsorship is the wind at your back," it states. The author goes further, arguing that the infrastructure is not what separates the two. "Like an algorithm, advertising tech itself is neutral. A sponsorship business can standardize and scale just as an ads business can. Ultimately, the difference between the two lies more in effect than intent. Advertising captures attention, whereas sponsorship empowers experience. Boston Market was a sponsor."

That framing deserves scrutiny. The distinction offered is one of effect, which is harder to verify than a distinction of placement or format. A reader cannot tell, from the post, how Substack would determine whether a given campaign had the "wind at your back" quality rather than the collar-grabbing one. The measurement section, discussed below, is the company's partial answer.

What was presented on October 8

"Today at Advertising Week, we're unveiling the next phase in our Sponsorships program: three new formats to help participating publishers earn more and reach new readers, plus new ways for brands to measure the trust, awareness, and consideration these partnerships build," according to the post's standfirst. Advertising Week New York ran from October 5 to 8, 2026, according to the event's website, which places the post on the final day.

The images accompanying the formats carry a caption: "Mock-ups shown for illustrative purposes only." The post does not include pricing, revenue splits between Substack and publishers, minimum budgets, availability dates or geographic limits for any of the three formats. It does not name brands that have run any of them.

The upgrade

The first format turns a brand into the payer for a trial subscription. "A brand provides a month of paid access for a publisher's free subscribers, giving them access to the publication at no cost," according to the post. "Readers get to experience the full publication and can become paying subscribers when the sponsored month ends. The brand earns goodwill with key audiences by giving them more of the writing they love."

The mechanism matters for publishers. A free subscriber on Substack already receives some posts but not those behind the paywall. A sponsored month removes that barrier for a defined period, and the conversion question - whether those readers pay once the month ends - is left with the publisher. The post does not say whether the publisher is paid the equivalent of a month's subscription per free reader, a flat fee, or something else. Nor does it say whether readers are told which brand paid for their access, although the stated aim of earning "goodwill" implies the sponsor is visible.

The unlock

The second format applies the same logic to a single piece of writing. "A brand sponsors one of a publisher's paid posts, making it free for everyone to read," according to the post. "The publisher gets paid for their work and can reach new readers who may go on to subscribe, or even become paid subscribers. Readers get to try a post that would otherwise be behind the paywall."

The audience here is wider than the upgrade. A sponsored paid post becomes readable by anyone, including people who have never subscribed, which gives the publisher a sample to circulate. The wording in the post contains a small oddity: it lists new readers who "may go on to subscribe, or even become paid subscribers," treating a free subscription and a paid one as two separate outcomes of the same unlock.

The masthead

The third format is a branded collection. "A brand partners with writers and creators to present work on a theme in a dedicated destination on Substack," according to the post. "Think of it as a digital zine, like a retail brand collecting gift guides, a hotel brand highlighting ambitious travel writing, or a tech brand selecting the best writing about the future."

The post pitches this as an alternative to a brand starting its own publication on the platform. "For most brands, it's a stronger starting point than launching their own publication: they'll partner with publishers that people already follow and tap into a built-in audience." The post does not explain how writers are selected for a masthead, who holds editorial control over the collection, or whether work is commissioned for it or drawn from existing posts.

Taken together, the three formats share one feature: in each case, the brand pays to remove or reduce a barrier between the reader and the writing, rather than to insert a message into it. That is the practical expression of the post's "effect, not intent" argument. Whether the brand's message appears in the post itself, as a banner, as a disclosure line, or not at all is not specified.

The June phase and the Creator Kit

The October formats build on a first phase announced in June. "In June, we announced the first phase of our native sponsorships program and introduced Creator Kits for Substack bestsellers, a customizable media kit that can help brands understand a publication and its audience," according to the post.

The June announcement, linked from the October post, was written by Substack co-founder Chris Best and dated June 15, 2026. It named seven inaugural flagship partners: Yahoo Scout, Whatnot, Granola, Balenciaga, T-Mobile, Polymarket and Uber. According to that post, the partners were investing "millions of dollars" in creators on the platform, without a total. It also stated that more than 100,000 publishers earn money on Substack through subscriptions and that the top 10 collectively earn more than $100 million a year. None of those figures has been independently verified.

The October post names three of the seven partners. "Over the past few months, we've been testing new ideas with brands like Balenciaga, Uber, and T-Mobile so that we can create more opportunities for publishers to earn money while preserving the direct subscriber relationship," according to the post.

Participation is voluntary on the publisher side. "Publishers choose whether they want to participate in sponsorships, and can opt in through their Creator Kit," it states. Substack's help center page on Creator Kits, also linked from the post, sets out how that works. According to the page as it read on October 22, 2026, Creator Kits are available to all Bestsellers publications and to publications with at least 100 paid subscribers. That is a wider group than the "Substack bestsellers" named in the October 8 post; the help page does not carry a visible date, so when the threshold changed is unclear.

The help page describes what a kit contains. Required sections are a publication description, stats, formats and an About section. Publishers choose which stats to show - subscriber count, open rate or active readers - and Substack automatically displays top countries, top US states and reader interest categories. A testimonials section allows up to four subscriber notes selected from a list Substack provides. A private "Not interested" field lets publishers list brand types they will not work with, visible only to Substack.

The page lists ten sponsorship format options, each with a minimum spend set by the publisher. The October 8 post refers to three "new formats" but does not say whether the upgrade, the unlock and the masthead are among those ten or additions to them.

Kits are not public. According to the help page, subscribers cannot see them, and only brands in Substack's sponsorship program that the Substack team has connected with a publisher can view a kit. For now, the Substack team handles all matchmaking; the kit is described as the entry point to a broader partnership platform that has no published launch date.

Measurement: Kantar surveys for large campaigns

The second part of the announcement concerns measurement. "Often, creator marketing is measured only by impressions and clicks, not by the real impact of developing trust, credibility, and authority," according to the post. "To present a more well-rounded picture, we're now offering Kantar studies for large-scale campaigns, supporting meaningful measurement through independent, privacy-safe surveys that track changes in brand awareness, perception, and consideration."

What the post describes is, in industry terms, brand lift research: surveys that compare how people exposed to a campaign answer questions about a brand against a control group that was not exposed. Kantar is long established in that work. In April 2024, Kantar was named a TikTok Measurement Partner for Brand Lift studies, having taken part in more than 700 TikTok studies.

Several details are absent. The post does not define "large-scale," so the spend threshold for a Kantar study is unknown. It does not say who pays for the study, what the sample sizes are, or whether results will be shared with publishers as well as brands. The link on "Kantar studies" in the post points to Kantar's general North America "About" page rather than to a methodology document. Substack's case rests on survey-based measurement being a better fit for subscription writing than attention metrics or click counts, though the post does not compare them directly.

The measurement gap Substack is addressing is well documented. An Association of National Advertisers report in August found that 67% of marketers called influencer measurement the hardest step of the 13 it examined, based on a member survey with 78 respondents to the primary questions. The same coverage cited a TransUnion and EMARKETER study that put measurement confidence in influencer marketing at 44.4%, the lowest of any channel.

Why it matters for the marketing community

Money is moving into creator media fast. The IAB projects US creator advertising spend at $44 billion for 2026, up from $13.9 billion in 2021 and $29.5 billion in 2024, according to IAB's own research. Those figures are not independently audited, but they explain why platforms built on other business models are trying to capture brand budgets that now flow to creators.

Substack's distinctive position is that its core revenue comes from readers, not advertisers. The creator economy has largely monetized through platform revenue shares, brand deals and fan payments, and most large platforms have started with advertising and added subscriptions later. Spotify, for instance, set out a podcast memberships model at its May 2026 investor day, alongside an existing partner program that pays creators from Premium engagement and free-tier advertising. Substack is attempting the reverse: adding brand money to a platform where subscriptions are already the business.

The three formats are designed so that the brand's spend feeds the subscription funnel rather than competing with it. A sponsored month of access is, in effect, a paid trial funded by a third party. A sponsored post is a sample. For publishers, that could convert brand budgets into subscriber acquisition; for brands, the pitch is association with writing readers already pay for. The post spells out the ambition: "A world where subscriptions are the floor, but not the ceiling."

There is a structural difference from YouTube's approach. YouTube consolidated BrandConnect into YouTube Creator Partnerships across seven markets in March 2026, with direct brand outreach, media kits and open calls that brands can use themselves. Substack's matchmaking is, by its help center's own description, still handled entirely by its team. That keeps volume low. "Right now, our team is bringing small groups of bestsellers and brands together as we test and learn," according to the post. "If you've already turned your kit on and haven't heard from us, know we're still early in that process and look forward to bringing more publishers into the program soon."

Is the distinction between an ad and a sponsorship one that buyers will pay a premium for? The post does not offer evidence either way. There are no campaign results, no conversion rates from sponsored months to paid subscriptions, and no figures on how many publishers have turned on a Creator Kit or how many have been matched with a brand. "We're still early in this process and learning what works," the author writes.

What the post asks of readers

The post closes with direct calls to action. Brands are pointed to an email address, sponsorships@substackinc.com, and a sign-up form. Bestsellers are told to turn on their Creator Kit to be considered for opportunities. The last line is a statement of intent rather than a commitment: "We're excited to keep building with you."

The vision section addresses three groups. "For publishers, a world where ads work for writers instead of writers working for ads," according to the post. "For brands, you can earn real standing instead of shouting through feeds and swipes." And for subscribers, the stated goal is reaction rather than resistance: "it's less 'there's an ad' and more 'that's interesting' or 'they made this possible.'"

Those are aspirations. What exists on the record as of October 22, 2026 is narrower: three formats illustrated with mock-ups, a Kantar survey offer for unspecified "large-scale" campaigns, a Creator Kit with ten publisher-set formats and minimum spends, and a test program run by hand.

Timeline

Summary

Who: Substack, through a guest post by its head of brand partnerships, signed "Dan @ Substack," addressing publishers on the platform, brands and agencies. Balenciaga, Uber and T-Mobile are named as brands Substack tested ideas with; Kantar is named as the measurement provider.

What: Three sponsorship formats - the upgrade (a brand funds a month of paid access for a publisher's free subscribers), the unlock (a brand makes one paid post free for everyone) and the masthead (a brand-presented themed collection of writing) - plus Kantar survey studies on brand awareness, perception and consideration for large-scale campaigns. No pricing, revenue split, launch date or results were disclosed.

When: The post is dated October 8, 2026, the final day of Advertising Week New York. It follows the first phase of the program announced on June 15, 2026.

Where: On Substack, the company's own publication, and Advertising Week New York. The formats would run on Substack publications and in dedicated destinations on the platform.

Why: Substack argues that sponsorships which pay for reader access build trust in a way interruptive ads do not, and wants brand money to become a second income source for subscription publishers. The test program is small, matchmaking is manual, and the post concedes the company is "still early in this process and learning what works."