MailAdx vs Mailchimp Ads for newsletter monetisation
Mailchimp's ad features are designed for advertisers buying via Mailchimp. MailAdx is designed for publishers who want to own their ad stack.
Mailchimp offers a basic ad marketplace that lets advertisers place ads in Mailchimp-hosted newsletters. For publishers, this means revenue from Mailchimp's ad network — but no control over pricing, advertiser selection, or placement design. It's a passive monetisation channel, not an ad infrastructure.
MailAdx is the opposite: publisher-centric infrastructure that gives you full control. You set the floors, you approve the advertisers, you define the placements, and you connect to the demand sources you choose — Mailchimp's network included, if you want it.
The key question is whether you want to monetise your list on someone else's terms, or build an ad business on your own.
Mailchimp Ads is structurally limited in a way that matters more as your newsletter grows. Mailchimp sets advertiser rates, handles creative review, and controls which brands appear in your newsletter. For a publisher earning $200/month in ad revenue, that simplicity is fine. For a publisher earning $2,000/month, every percentage point of eCPM improvement compounds. MailAdx publishers typically see 30–50% higher eCPM versus passive network monetisation because they can set category blocks, run direct-sold campaigns at negotiated rates, and add programmatic fill above a floor they control.
Pricing transparency is a meaningful difference between the two models. Mailchimp does not publicly disclose its revenue share terms for publishers — rates are negotiated or set by Mailchimp and can change without much notice. MailAdx charges a flat per-impression serving fee (typically around $0.40–$0.50 CPM), published and fixed. Everything above that fee goes to the publisher. A newsletter generating $3,000/month in gross ad revenue with a 20% revenue share loses $600 to the platform; on MailAdx's model, the serving cost on the same volume is roughly $80–$100.
Switching from Mailchimp Ads to MailAdx while keeping Mailchimp as your ESP is entirely practical — the two changes are independent. Mailchimp remains your email sending platform. You add MailAdx by pasting an ad tag into a custom HTML block in your Mailchimp template and adding the *|EMAIL_SHA256|* merge tag. Existing advertisers who found you through Mailchimp's marketplace can be moved to direct deals in MailAdx at your own pricing, or you can connect programmatic demand as a fill source for inventory they don't cover.
Feature comparison
| Feature | MailAdx | Mailchimp Ads |
|---|---|---|
| Publisher-controlled ad stack | ||
| Custom price floors per placement | ||
| Direct advertiser relationships | ||
| OpenRTB programmatic demand | ||
| Open-time ad server | ||
| Multi-placement per newsletter | ||
| Works with any ESP | ||
| Native Mailchimp integration | ||
| Included ad network demand | ||
| Free to start | ||
| Advertiser self-serve platform | ||
| White-label publisher portal | ||
| Native ad format (composite PNG, no JS) | ||
| Ad Journeys (sequential ad campaigns) |
Where MailAdx wins
You own the advertiser relationship
With Mailchimp Ads, Mailchimp is the seller and you're the inventory. Revenue share terms are set by Mailchimp and can change. With MailAdx, you negotiate directly with advertisers, set your own pricing, and build the relationships. Publishers on MailAdx typically earn 40–60% more per impression than through passive ad networks.
Works across all your platforms
If you send newsletters from Mailchimp, Mailchimp Ads works. If you switch to Beehiiv, you lose the integration. MailAdx connects to all 22+ ESPs via the same ad tag + merge field pattern — your ad stack survives any platform migration intact.
Programmatic demand at your terms
MailAdx connects to OpenRTB demand sources that you select, with floor prices you control. Mailchimp Ads connects you to Mailchimp's proprietary network with terms set by the platform. Programmatic gives you access to a much broader pool of demand.
Built for growth beyond a single ESP
Mailchimp Ads is a feature within Mailchimp's platform. MailAdx is a standalone ad infrastructure that grows with your business — from a single newsletter to a multi-publisher network under your own brand.
When Mailchimp Ads is the better choice
- You're just starting out and want zero-setup passive income — Mailchimp Ads requires no configuration beyond a checkbox.
- You send exclusively via Mailchimp and have no plans to move ESPs.
- Your audience is small (<10k subscribers) and the overhead of managing an ad stack outweighs the higher eCPM.
- You want Mailchimp to handle advertiser relationships and payment processing entirely on your behalf.
Not sure which fits your situation? Talk to us — we'll give you an honest recommendation.
Frequently asked questions
Does MailAdx work if I keep sending through Mailchimp?
Yes. MailAdx integrates with Mailchimp via a custom HTML block and the *|EMAIL_SHA256|* merge tag — your sending workflow stays exactly the same. You're adding an ad serving layer, not migrating your ESP. Most Mailchimp publishers are live with MailAdx within a few hours of setup.
What revenue share does Mailchimp take on Mailchimp Ads?
Mailchimp does not publish its revenue share terms publicly. Terms are typically set by Mailchimp and are subject to change. MailAdx charges a flat per-impression serving fee with no revenue share — you keep 100% of what advertisers pay for your inventory above the platform fee.
Can I run direct sponsors in MailAdx while keeping Mailchimp Ads as a backup?
Yes. MailAdx's waterfall is designed for exactly this: direct-sold campaigns at your negotiated rates fill first, then programmatic demand fills remaining inventory. You can connect Mailchimp's advertiser pool via OpenRTB as one demand tier, so you don't lose that revenue while you build out direct relationships.
Is Mailchimp Ads available on all Mailchimp plans?
Mailchimp Ads availability and monetisation features depend on your plan and whether Mailchimp has approved your newsletter for their marketplace. MailAdx has no such approval requirement — any Mailchimp publisher with a list can integrate the ad tag and start running campaigns.
What happens to my advertiser relationships if I switch from Mailchimp Ads to MailAdx?
Advertisers who ran campaigns through Mailchimp's marketplace are Mailchimp's customers, not yours — you have no direct relationship or contact information. On MailAdx, every advertiser is your relationship. Direct deals you negotiate outside any marketplace transfer immediately since you own the commercial relationship.
See MailAdx vs Mailchimp Ads in a live demo
Get a personalised walkthrough and see which platform fits your newsletter ad workflow.