12 Best Newsletter Sponsorship Marketplaces

More than 4.8 billion people read their email inboxes every single day.

Newsletter ads work because people pick the newsletters they get.

A sponsor slot in an inbox people look forward to reaches readers who open, read and click, with zero ad blockers in the way. Brands know it: one marketplace reports newsletter ad campaigns up 40% in a single year, and 64% of marketers now buy newsletter ads.

Finding the right newsletters is the hard part. There are thousands of them. Prices swing hard by niche. And most publishers sell their slots by email. Sponsorship marketplaces fix that. They put slots, prices and booking in one place.

I compare 12 of the best options here. Some are true marketplaces. Some are ad networks that place ads for you. Others help you find or manage sponsors. For each one you get how buying works, the fees, who it fits and the catch.

Best Newsletter Sponsorship Platforms

Platform	Type	Best For	Pricing Model	Fee
Paved	Marketplace and CPC network	Brands buying across many niches	Flat fee or CPC	30% on marketplace, 50% on network (paid by publishers)
Passionfroot	B2B creator marketplace	B2B and SaaS brands	Flat fee per placement	5% brand fee, 15% creator fee on network deals
beehiiv Ad Network	Built in ad network	beehiiv publishers	CPM or CPC	Revenue share, private
Kit Sponsorships	Managed offers	Kit creators	Per verified click	Private
SparkLoop Partner Network	Paid recommendations	Growing a newsletter	Cost per subscriber	20% plus 3.5% on publisher earnings
Substack Sponsorships	Managed program	Big brands on Substack	Minimum spend per format	Private
BuySellAds	Managed network	Developer and tech audiences	Flat fee and CPM	Varies
LiveIntent	Programmatic email ads	Enterprise publishers and brands	Programmatic CPM	Varies
Letterhead	Email platform with ad tools	Media companies	Direct and programmatic	Platform fee
Sponsy	Sponsorship management software	Publishers selling direct	Subscription	Monthly plan
Who Sponsors Stuff	Sponsor database	Publishers finding sponsors	Annual license	License fee
Reletter	Newsletter search engine	Brands finding newsletters	Freemium	Paid plans

How Newsletter Sponsorship Marketplaces Work

Every platform on this list connects two sides: brands with a budget and newsletters with readers. The model changes how you pay.

• Flat fee marketplaces: publishers list slots at a set price, such as $800 for a primary sponsor spot. You pick, book and pay.
• Performance networks: you bid per click (CPC) or per thousand opens (CPM), and the network places your ad across many newsletters.
• Cost per subscriber networks: you pay for each new reader another newsletter sends your way.
• Managed programs: a team matches your brief to newsletters and handles the booking.
• Research and management tools: they help you find newsletters or sponsors, then you deal directly.

Pick the model that matches your goal. Flat fees fit brand awareness, CPC fits direct response, and cost per subscriber fits list growth.

The 12 Best Newsletter Sponsorship Marketplaces

1. Paved

Paved is the closest thing to a full newsletter ad exchange. It runs a marketplace for direct bookings, a CPC ad network and a free booking tool called Booker for publishers. The network reaches about 253 million readers across 3,000+ publishers. Brands such as Uber, HubSpot and Noom buy on it.

How buying works: In the Marketplace, you book flat fee slots at prices the publisher sets. Each listing shows reviews and expected results. In the Ad Network, you bid $0.50 to $10 per click and Paved spreads your ad across matching newsletters. Last minute slots sell at a discount.

Fees and pricing: Free for advertisers. Publishers pay 30% on marketplace bookings and 50% on network earnings. Many add that to their rates.

Who it fits: Brands that want both direct buys and performance campaigns in one account.

The catch: Expected results are averages, so first bookings carry some risk. Newsletters need about 5,000 subscribers to get listed, which keeps out many small but high value niche lists.

Website: paved.com

2. Passionfroot

Passionfroot is a B2B creator marketplace. It covers newsletters, LinkedIn creators, YouTube and podcasts in one place. It raises a $15 million Series A in July 2026 and expands into the US. Brands such as Figma, Notion, HubSpot, ElevenLabs and Replit book creators through it.

How buying works: Creators set up a storefront and media kit. Brands browse, book and pay on platform. An AI campaign agent called Zest helps brands plan and shortlist creators.

Fees and pricing: The core product is free. Brands pay 5% on deals booked from a creator storefront, and creators pay 15% on deals sourced through the Passionfroot network.

Who it fits: B2B, SaaS and AI brands that want newsletters and creator posts in one campaign.

The catch: The focus stays on B2B, so consumer brands find fewer matches. Creators need to keep payments on platform to receive network deals.

Website: passionfroot.me

3. beehiiv Ad Network

The beehiiv Ad Network serves ads inside newsletters sent on beehiiv. It grows out of the beehiiv purchase of Swapstack in 2023 and now pays publishers more than $1 million a month. Advertisers include Brooklinen, BetterHelp, Hims, Masterworks and Babbel.

How buying works: Advertisers choose CPM, priced per 1,000 unique opens, or CPC, priced per verified click. Publishers see up to 15 offers at a time, reserve up to five and run up to three ads per post.

Fees and pricing: Revenue share is unpublished. Publishers get paid monthly through Stripe Express.

Who it fits: Brands that want scale across many independent newsletters, and beehiiv publishers who want ads with zero sales work.

The catch: It covers beehiiv newsletters only, and publishers need a paid plan to join.

Website: beehiiv.com/features/ad-network

Also See: Best Newsletter Platforms

4. Kit Sponsorships

Kit, formerly ConvertKit, runs sponsorship offers for creators on its email platform. The original Sponsor Network launches in 2022, and the current version emails offers straight to creators.

How buying works: Kit sends offers that pay per verified unique click. Creators accept or decline, and Kit pays by the fifteenth business day of the next month.

Fees and pricing: Current fees are unpublished. The first version took 20% plus processing.

Who it fits: Creators already on Kit who want occasional paid offers with zero sales effort.

The catch: Eligibility and fees stay private, and the programmatic Kit Ads product takes zero new applications right now.

Website: kit.com

5. SparkLoop Partner Network

SparkLoop runs paid newsletter recommendations. When a reader signs up to one newsletter, they see others to join, and the advertiser pays for each new subscriber. Kit owns SparkLoop since 2023.

How buying works: Advertisers pay only for subscribers who stay on the list for 14 days. Publishers earn $2 to $20 per new subscriber, and brand offers pay $2 to $200+ per conversion.

Fees and pricing: Advertiser plans start at $100 a month, with custom plans from $2,000. Publishers pay 20% plus 3.5% on earnings.

Who it fits: Newsletters that want to grow fast and brands that measure success in new subscribers.

The catch: This buys list growth over awareness, so the subscriber quality depends on the newsletters in the network.

Website: sparkloop.app/partner-network

6. Substack Sponsorships

Substack launches its managed sponsorship program in June 2026 and adds new formats called Upgrade, Unlock and Masthead in October. Brands such as Uber, T Mobile, Balenciaga and Whatnot run campaigns.

How buying works: Brands email the Substack team, which matches them with publications. Writers opt in with a Creator Kit that sets minimum spends across 10 formats. Big campaigns come with Kantar brand lift studies.

Fees and pricing: Revenue splits are private. Brands pay per campaign.

Who it fits: Large brands that want premium writers and brand safety, plus measurement.

The catch: It runs as a managed service, so small budgets get little attention. Writers need Bestseller status or 100+ paid subscribers.

Website: substack.com

7. BuySellAds

BuySellAds is a long running ad network with a strong developer and tech audience. It sells ad spots in newsletters, on websites and in podcasts. It also links up with the Buttondown newsletter platform.

How buying works: Brands work with the BuySellAds team or buy listed placements, as flat fee or CPM sponsorships.

Fees and pricing: Pricing depends on the placement and the publisher.

Who it fits: Developer tools, SaaS and tech brands that want reach across many technical publications.

The catch: Public data on fees and network size is thin, so ask for audience stats before you book.

Website: buysellads.com

8. LiveIntent

LiveIntent places ads in email through automated buying. It places display ads inside newsletters from large publishers and lets brands target readers based on the email address. LiveIntent also agrees to be acquired by Zeta Global, so expect the product to fold into the Zeta platform over time.

How buying works: Brands and agencies buy through programmatic deals, priced on CPM.

Fees and pricing: Pricing depends on the deal and volume.

Who it fits: Enterprise publishers with big lists and brands with programmatic budgets.

The catch: It fits large players. Small newsletters and small budgets find better options higher on this list.

Website: liveintent.com

9. Letterhead

Letterhead is an email platform for media companies, with customers such as Conde Nast, WIRED and Vogue. Its ad tools help publishers sell and run ads in their newsletters.

How buying works: Publishers manage ad inventory and fill it with direct deals or programmatic demand.

Fees and pricing: Priced as a platform subscription.

Who it fits: Media brands that run many newsletters and want ads and email in one system.

The catch: It works more like publisher software than an open marketplace, so brands still buy through the publisher.

Website: tryletterhead.com

10. Sponsy

Sponsy helps you manage sponsors for a newsletter, podcast or YouTube channel. It keeps your ad calendar, sponsor portal, CRM and reports in one place. Last Week in AWS, Demand Curve and DTC Media use it.

How buying works: Sponsors book open slots through your portal, upload copy and get reports pulled from your email platform.

Fees and pricing: Monthly plans start near $79, with pricing tied to the number of ads you book.

Who it fits: Publishers who sell sponsorships directly and want to stop juggling spreadsheets and emails.

The catch: It brings zero new demand. You still need to find sponsors yourself.

Website: getsponsy.com

11. Who Sponsors Stuff

Who Sponsors Stuff tracks which brands sponsor which newsletters. It covers 500+ newsletters and holds contact details for 3,000+ sponsors.

How buying works: Publishers search the database, see who sponsors similar newsletters and pitch those brands directly.

Fees and pricing: Sold as an annual license.

Who it fits: Newsletter owners who want warm sponsor leads.

The catch: It is a lead source, so the selling, pricing and booking stay on you.

Website: whosponsorsstuff.com

12. Reletter

Reletter is a search engine for newsletters. It lists millions of them, with filters for topic, readers and platform.

How buying works: Brands search for newsletters in their niche, check details and contact the publisher.

Fees and pricing: Free to start, with paid plans for advanced filters and contact data.

Who it fits: Brands and agencies that want to build a list of newsletters before reaching out.

The catch: It calls itself a database, so every deal still happens by email.

Website: reletter.com

Newsletter Ad Rates by Niche

Niche drives price more than list size. Here is what Paved advertisers pay per 1,000 subscribers, based on completed marketplace campaigns in the third quarter of 2026:

Niche	Price per 1,000 Subscribers
HR	$18.47
Marketing	$13.88
Startups	$13.28
Tech	$4.76
News	$2.47
Lifestyle	$1.22

HR newsletters cost about 15 times more than lifestyle lists because each reader is worth far more to the advertiser. Across the industry, consumer newsletters sit around $15 to $35 per 1,000 opens and B2B newsletters around $50 to $100+. Click based deals land between $1 and $5 per click.

How to Work Out If a Newsletter Sponsorship Is Worth It

Run the math before you book. Take a newsletter with 40,000 subscribers, a 45% open rate and a primary sponsor slot priced at $1,200.

• Opens: 40,000 x 45% = 18,000 opens.
• Cost per 1,000 opens: $1,200 / 18 = about $67.
• Clicks: at a 1.5% click rate on opens, about 270 clicks.
• Cost per click: $1,200 / 270 = about $4.44.
• Break even: if 3% of clicks buy, that is about 8 sales, so each sale needs $150 in profit to break even.

Compare that cost per click with your paid search and social numbers. This guide on ROAS vs ROI helps you judge the result, and this one on SEO vs Google Ads shows where newsletter spend fits next to search.

Marketplace or Direct Outreach: Which Should You Use?

Marketplaces save time on discovery, booking and payment, and they add reviews and performance data. The trade off is a fee, built into the price, and a smaller pool of newsletters.

Direct outreach costs zero fees and opens up newsletters that refuse marketplaces, such as many top niche lists. It takes more time, and you carry all the risk on payment and reporting.

Most brands use both. Test on a marketplace, find the newsletters that convert, then book them direct for repeat runs at a better rate.

How to Vet a Newsletter Before You Pay

• Ask for a screenshot of the last 30 days of sends with opens and clicks.
• Check that the open rate holds steady across issues, beyond one high outlier.
• Read three recent issues to judge tone, ad load and reader replies.
• Look up past sponsors with Who Sponsors Stuff and contact one or two.
• Confirm the ad position, copy length, image rules and send date in writing.
• Use a unique link or promo code so you track results cleanly.

For Newsletter Owners: How to Get Sponsors Through Marketplaces

Start with the network built into your email platform, such as beehiiv or Kit, since setup takes minutes. Add a Passionfroot storefront if you write for a B2B audience, and a Paved listing once you pass about 5,000 subscribers. As direct demand grows, move repeat sponsors to your own booking page with Sponsy so you keep the full fee.

Price slots by audience value, beyond list size. A 3,000 reader HR newsletter earns more per issue than a 30,000 reader lifestyle list. Growth tools such as SparkLoop help you add readers, and these B2B marketing platforms show where else B2B sponsors spend.

Newsletter Sponsorship Marketplace FAQs

What Is a Newsletter Sponsorship Marketplace?

It is a platform where brands find and book ad slots in newsletters, and where newsletter owners list their slots and get paid.

How Much Does a Newsletter Sponsorship Cost?

Prices range from about $1 to $18 per 1,000 subscribers depending on niche, or $15 to $100+ per 1,000 opens. Click based deals run $1 to $5 per click.

Which Newsletter Ad Network Pays Publishers the Most?

It depends on your niche and size. beehiiv pays its publishers more than $1 million a month in total, while SparkLoop pays $2 to $20 per new subscriber.

How Many Subscribers Do I Need to Get Sponsors?

Paved lists newsletters from about 5,000 subscribers, while beehiiv, Kit and Passionfroot accept smaller lists.

Is Swapstack Still Available?

Swapstack is part of beehiiv since 2023, and its technology now powers the beehiiv Ad Network.