Worked scenario

Buying a podcast mid-roll, end to end

By Oliver Wakefield-Smith · updated October 2026

The short answer

A 30-second host-read at $18, the low end of the $18 to $22 average CPM that Libsyn Ads (formerly AdvertiseCast) publishes, on a show averaging 20,000 downloads per episode invoices at $360. Move to a 60-second read at $24, the low end of its $24 to $26 range, and the same episode costs $480. The denominator is downloads, not listens.

PAY: podcast CPMEARN: creator income

The invoice math

invoice = CPM × downloads ÷ 1,000

30s host-read: $18.00 × 20,000 ÷ 1,000 = $360

60s host-read: $24.00 × 20,000 ÷ 1,000 = $480

Rates: low ends of Libsyn Ads' published host-read averages ($18-$22 and $24-$26), retrieved October 2026.

Most direct deals price against the show's trailing average downloads per episode at 30 days, not against a hoped-for peak. Ask which window the seller uses; a show quoting its best episode ever is quoting a different product.

What a download actually is

Billing runs on the IAB Podcast Measurement Technical Guidelines: a download counts after filtering bots, duplicate requests and partial fetches. It does not prove a human heard your ad; it proves a filtered file request happened. That measurement honesty matters when you compare podcast CPMs against served and viewable impressions elsewhere; the comparability caveat is worked at YouTube vs podcast.

30s host-read$18-22Podcast 30-second baked-in host-read ad, overall average CPM range per 1,000 downloads (tools use the $18 low end)Libsyn Ads (formerly AdvertiseCast) podcast advertising ratesretrieved October 2026

60s host-read$24-26Podcast 60-second baked-in host-read ad, overall average CPM range per 1,000 downloads (tools use the $24 low end)Libsyn Ads (formerly AdvertiseCast) podcast advertising ratesretrieved October 2026

What billsIAB v2Podcast impressions are filtered downloads under the IAB Podcast Measurement Technical GuidelinesIAB Tech Lab podcast measurement guidelinesretrieved July 2026

Slot and format spreads

Position.Libsyn Ads' published averages cover pre- or mid-roll spots; any premium for a particular slot varies by show and is quoted at deal time.
Host-read vs programmatic inserts. Host-reads carry the trust premium; the same rate page lists programmatic pre-produced spots at $12 to $15, which behave more like standard audio inventory (see Spotify ads for that lane).
Niche.Libsyn Ads' category table puts Business shows at $30 and Games and Leisure at $22 for baked-in host-reads. Same auction logic as everywhere: scarcity of the audience, not quality of the show.

Buyer's context lives at podcast advertising CPM; the seller's side of this exact deal is at what podcasters earn. Full benchmark table: /rates.