Substack's New Sponsorship Formats: Creator Checks

Substack has introduced three ways for a brand to sponsor a publication: an upgrade for free subscribers, an unlock of a paid post, and a themed masthead. A publisher should treat each as a different product with different audience, editorial and payment questions. The October announcement is an early look at a programme being tested with small groups of bestsellers and brands, not an open marketplace or a promise that switching on a Creator Kit will produce an offer.

The timing matters. Substack's October 8 announcement presented the formats at Advertising Week. DesignRush reported the same day on the brand measurement pitch and interviewed Substack's sponsorship lead. Insideletter's October 11 newsletter roundup also noted that the programme remains selective. Those are accounts of an announced and developing product; none establishes a typical payout or that every publisher can book a campaign today.

What did Substack actually announce?

The upgrade lets a brand fund one month of paid access for a publication's free subscribers. The unlock lets a brand fund access to one paid post so everyone can read it free. The masthead brings work by writers and creators on a theme into a dedicated Substack destination with a brand. Substack also says it is offering Kantar studies for large campaigns to measure changes in awareness, perception and consideration. That is a campaign measurement option, not a performance guarantee to a publisher.

These formats affect different assets. An upgrade touches the subscriber experience and the boundary between free and paid access. An unlock changes distribution of a specific paid article. A masthead may involve a new editorial brief, multiple contributors and a brand-associated destination. A publisher considering one should ask what is being sponsored, what the sponsor can approve, where the work appears and when the arrangement ends. If a pitch simply says “Substack sponsorship,” ask which format it means.

Substack's June introduction to native sponsorships described publisher choice and editorial independence as aims of the programme. Those statements do not supply the terms of an individual campaign. Get the actual brief and agreement, including any platform terms, before committing your archive, subscribers or future work.

Upgrade: clarify what the brand is funding

An upgrade is not just a logo next to a newsletter. It gives free subscribers a month of paid access funded by the brand. A useful brief should identify the eligible subscriber group, the start and end dates, what paid content they can access, what subscribers will see about the sponsor and what happens when the funded month ends. Ask whether any conversion message is planned and who controls it. Do not promise that readers will convert to paid subscribers or that a sponsor can see private reader information unless the signed terms and platform controls actually say so.

For the publisher, price the work and access separately in your own decision. Is there new copy, an announcement, a live event or a custom welcome sequence, or is the brand only funding access? Who supplies creative assets and who approves reader-facing language? How will a cancelled or delayed launch affect the fee? Define the reporting the brand receives without offering personal subscriber records you cannot or should not share. A claim about conversion needs a defined measurement period and a definition of the denominator.

Unlock: protect the post and its future use

An unlock funds one paid post so a wider audience can read it. Name the exact post or commission, the date it becomes free, how long the funded access lasts and whether it returns behind the paywall. If the post does not yet exist, agree on topic, length or format, drafting deadline and a reasonable review process before the sponsor attaches its name to it. If it is an existing article, check whether paid subscribers were promised exclusivity and whether the change calls for an explanation to them.

Separate access from rights. Paying to unlock a post does not, by itself, answer whether the brand can repost the full article, excerpt it in ads, translate it, use the author's name in a landing page or keep screenshots after the campaign. Put each proposed use, channel, territory and duration in writing. The OfferVet guide to organic and paid content usage offers a more detailed rights checklist. A creator can agree to public access on Substack while reserving other uses for a separate discussion.

Also ask what happens to the sponsored label when an article is shared by email or viewed on the web. U.S. publishers making endorsements should review the FTC's disclosure guidance; other places may apply different rules. A format name or platform feature is not a substitute for a clear explanation of a material brand relationship to readers.

Masthead: define each contributor's part

Substack describes a masthead as a dedicated destination around a theme, supported by a brand and featuring work from multiple writers or creators. That sounds closer to a small editorial project than a single ad placement. Identify the destination, number and type of contributions, commissioning party, named editor, approval contact, publishing schedule, distribution commitments and whether the sponsor may use each contributor's name or work elsewhere.

If several people contribute, ask who contracts and pays each person. A collective campaign can leave a creator waiting if the brand's payment flows through an agency, publisher or lead creator. Require a written fee, payer, invoice trigger and due date for your work. Check whether the brand expects exclusivity, category restrictions, promotion on your own channels, event attendance or a reusable content licence. Those are separate commitments even when packaged as one theme. If a campaign expands after the first brief, use a written change with a new fee and date instead of letting added work disappear into the original price.

What a participating publisher can do now

Substack's Creator Kit help page says the kit is currently available to Bestseller publications or those with at least 100 paid subscribers. Eligible publishers can express interest through the Sponsorships tab. The kit includes publication information, selected audience metrics, preferred formats and a minimum spend field. It is optional; Substack says only connected programme brands can view it, and that its team currently handles matching. Eligibility to make a kit is not eligibility for a particular brand deal.

Before opting in, review the fields as a buyer would. Use dated, accurately defined audience figures; avoid implying every subscriber reads every issue. Put categories you would decline into the private “Not interested” field, then apply your own standards when a brief arrives. If someone contacts you claiming to be from Substack or a sponsor, start from your account's Sponsorships area and verify the contact through a separate known route. A convincing logo or message thread is not proof of a genuine campaign. The OfferVet sponsorship-scam checklist covers that first contact.

A short brief review before accepting

Ask the person offering a campaign to answer these questions in one document:

1. Format and placement: upgrade, unlock or masthead; exact publication, post or destination; start and end dates.
2. Editorial scope: who chooses the topic, writes copy, approves factual claims and can request changes; how many review rounds are included.
3. Audience promise: what free and paid readers receive, what notices they see, and which metrics may be reported to the brand.
4. Rights: permission for excerpts, screenshots, paid promotion, translations, name and likeness use, and the end date for each.
5. Money: legal payer, fee and currency, invoicing event, payment due date, expenses, cancellation and any intermediary.
6. Evidence and safety: the correct sponsor entity and contact route, substantiation for any product claims, disclosure wording and a route to resolve a problematic brief.

An illustrative negotiation could be: “I can unlock the named article on Substack for the agreed campaign period and include the approved sponsor notice. Paid social excerpts, a new article and newsletter placements are separate.” This describes a possible scope boundary, not a standard Substack offer or platform policy. The creator statement-of-work guide shows how to record such boundaries in one place.

Keep the announcement in perspective

This is a meaningful new option for selected newsletter publishers because it lets a brand fund reader access or a themed editorial package instead of buying only a conventional placement. The format still needs a specific, vetted offer and clear terms. Decide whether the arrangement serves readers, then negotiate the work, rights and payment the same way you would for any other brand partnership. DealShield can help organise an inbound offer and flag suspicious signals or missing terms through OfferVet's checker. It cannot inspect private Substack eligibility, certify a sponsor, guarantee a campaign or payment, or provide legal, tax or financial advice.

Sources

• Substack: A new vision for sponsorships, October 8, 2026
• DesignRush: Substack's three formats and Kantar studies, October 8, 2026
• Insideletter: Substack sponsorship roundup, October 11, 2026
• Substack: A business model that works for creators, June 15, 2026
• Substack Help: Set up a Creator Kit, updated June 16, 2026
• FTC: Disclosures 101 for Social Media Influencers