MailAdx - Fill Newsletter Ads, Keep 100% Revenue
Monetize every newsletter send with 94% fill rate, no revenue share.
What is Mailadx?
MailAdx is an ad-tech platform that automatically fills newsletter ad slots through real-time bidding auctions at open time. It works as both an SSP for publishers and a DSP for advertisers, integrating with 22+ ESPs like Beehiiv, Mailchimp, and Klaviyo with a single tag. Publishers get 94% average fill rates and $4+ eCPM with no revenue share, while advertisers reach engaged email readers with first-party audiences and sequential campaign journeys.
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Key Features of Mailadx
- Real-time bidding auctions at open time
- 94% average fill rate
- $4+ eCPM for engaged audiences
- Integration with 22+ ESPs (Beehiiv, Mailchimp, Klaviyo)
- Drag-and-drop ad unit builder with live preview
- Per-placement floor prices and category blocks
- Publisher portal with real-time fill and revenue tracking
- Advertiser DSP with audience targeting by topic, geo, and list size
- Ad Journeys: sequential multi-send campaigns with branching
- Multiple creative formats: image, text, sponsored sections
- Live in 30 minutes
- No revenue share
- Decision delivery in under 5ms
Who Should Use Mailadx?
Turn newsletter subscriber opens into ad revenue
Monetize newsletter inventory automatically
Reach engaged email readers with targeted ads
Retarget newsletter openers, clickers, and converters
Launch sequential email ad campaigns with branching logic
Manage multi-send advertiser journeys across newsletter audiences
Control ad placements and advertiser categories per newsletter
Mailadx: Pros & Cons
✓Pros
- No revenue share - keep 100% of earnings
- Live in 30 minutes with one tag
- High fill rates (94% average) reduce empty ad slots
- Competitive eCPM ($4+) for engaged subscribers
- Supports 22+ ESPs with single integration
- Real-time bidding ensures optimal pricing
- First-party email-hash audiences avoid cookies and guesswork
- Transparent delivery and revenue reporting
- Sub-5ms ad decision time
- No credit card required to start free
Frequently Asked Questions about Mailadx
Which ESPs does MailAdx work with?
MailAdx works with 22+ ESPs including Beehiiv, Mailchimp, and Klaviyo. You integrate by pasting one tag into your ESP.
How long does it take to go live?
MailAdx can go live in 30 minutes with a single tag installation in your ESP.
What is the average fill rate and eCPM?
MailAdx delivers a 94% average fill rate with $4+ eCPM for engaged newsletter audiences.
Is there a revenue share?
No - MailAdx has no revenue share, so publishers keep 100% of their earnings.
How fast are ad decisions made?
Ad decisions are delivered in under 5 milliseconds through real-time bidding auctions.
Tool Details
- Pricing
- Free
- Category
- Programmatic
- Added
- Jul 2026
- Last Updated
- Jul 2026
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