Guides & resources

Long-form notes from running newsletter ad placements. Practical, opinionated, and grounded in deals that closed (or fell apart) — not theory.

How to price newsletter sponsorship slots

8 min

A practical pricing framework for newsletter operators with 5k-100k subscribers. CPM benchmarks by niche, what advertisers will pay vs walk away from, and the floor pricing trap that loses you 30% of inventory revenue.

For newsletter operators

The advertiser checklist for vetting a B2B newsletter

10 min

Twelve things to check before you book a sponsorship — open-rate authenticity, audience overlap with your ICP, list cleanliness signals, historical sponsor mix, and the four red flags that predict a campaign disappoints.

For advertisers

How the 10-20% broker fee actually works

6 min

Why the fee, who pays it, and what you get for it. Comparison against running campaigns yourself, and the three cases where the broker model produces a worse outcome than direct booking.

For advertisers and operators

Glossary — newsletter advertising terms

Operator-grade definitions for CPM, CTR, primary placement, dedicated send, sponsor cadence, list cleanliness, and the rest of the vocabulary you need to read a rate-card without translation.

Have a topic you want covered?

Email hello@inventoryspread.com and we’ll write it — if it’s a question we’re also asking ourselves, it’ll ship within two weeks.