Sponsors
Browse live inventory with real rates and specs, and book on the spot.
Free to browse · Free sponsor intel · Pay only for what you book
Find newsletters to sponsor
Publishers list what they have with rates and specs published up front. Filter to the audience you want, see the next opening, and book the slot — without a single introductory email.
The Ops Letter
Newsletter48.2k· Next opening 12 Mar
$1,850
per issue
Signal & Noise
Dedicated send31.4k· Next opening 14 Mar
$2,400
per send
Build Notes
Newsletter112.9k· Next opening 21 Mar
$3,100
per issue
Bellwether Intel
100% freeBellwether tracks which sponsors run in which newsletters, how much reach they buy, and how often they come back. Check a newsletter’s sponsor history before you book it — and see exactly where your competitors are running. Tools like this cost hundreds a month; ours is free.
Booking and ad creative
Every placement publishes its spec — dimensions, copy length, file limits — so what you upload is checked before it goes anywhere. The publisher approves, asks for a change, or rejects, and the whole exchange stays on the booking.
Bookings
1 needs reviewNorthwind Tools
Above the Fold · Issue #184 · 12 Mar
Cobalt Analytics
Mid-roll · 60s · Ep. 92 · 14 Mar
Harbor Payroll
In the Fold · Issue #185 · 19 Mar
Vela Insurance
Above the Fold · Issue #186 · 26 Mar
Creative review
Everything you need to buy newsletter ads
Every placement with its real rate, creative spec and next opening — searchable and filterable by the audience you want.
See which sponsors run where and how often they come back, before you commit a budget. Free for every member.
Take the issue or the multi-issue pack you want straight from the publisher’s own calendar.
Dimensions, copy length and file limits are published per placement, so your creative fits the slot first time.
Group bookings across several publishers into one campaign and track them together rather than one by one.
Invoices are tied to the bookings that created them, with payment status visible to both sides.
How to buy newsletter advertising
Tell us the brand you are buying for. Browsing and Bellwether are free.
Filter live inventory by channel, category, audience size and next opening.
Take the issue you want and submit creative against the published spec.
The publisher approves, the ad runs, and billing follows the booking.
Questions
Nothing. Browsing inventory and using Bellwether are both free. You pay the publisher’s published rate for the placements you actually book.
Publishers do. Every rate you see is the publisher’s own, published up front — so there is no rate-card request and no negotiation round before you can even see a price.
Availability comes straight from the publisher’s placement calendar rather than a list someone updates by hand, so a slot shown as open is genuinely open.
You will know at upload. Specs are enforced per placement, and if the publisher wants a change they request it on the booking, so revisions never get lost in an email thread.
Yes. Group bookings across publishers into a single campaign and track them together, with one place to see what is booked, approved and live.
Our free sponsor-intelligence tool. It shows which sponsors run in which newsletters, how much reach they buy, and how often they come back — so you can check a newsletter’s sponsor history before you book it.
Create an account, browse live inventory, and book the placement you want. Browsing and Bellwether cost nothing.
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