One sponsor link.
Every episode, forever.
Paste one durable link into your show notes. When a sponsor updates their destination, change it once in Castmark and it updates everywhere instantly, even in episodes from months ago.
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Total clicks
84,213
Clicks this week
3,842
Active links
12
Clicks in the last 30 days
The old way
Sponsor links rot in your back catalog.
Dead links in old episodes
The sponsor changes their URL and forty episodes of show notes quietly 404.
Re-editing show notes forever
Every campaign change means touching every episode, on every platform, again.
No idea what converted
A sponsor asks which episodes drove clicks and you have nothing to show them.
How it works
Set it once, forget it forever.
Create a link per sponsor
One durable URL, such as castmark.pro/your-slug, that points to the sponsor's page.
Paste it in your show notes
Same link, every episode, on every platform. Write it once.
Episode 142 show notes
This week's episode is brought to you by Acme Coffee. Get 20% off your first bag at castmark.pro/acme-coffee. Same link every episode. Bookmark it once.
Swap the destination anytime
Every episode, past and future, points to the new URL instantly.
Destination URL
roastworks.com/fall-blend
roastworks.com/winter-blend
Updates 42 episodes instantly. Nothing else to edit.
Know what worked
Click analytics, broken down the way you'd ask for it.
Every click is logged with device, referrer, and timestamp, then rolled up per sponsor and per campaign so you can see what's actually moving.
- Clicks over time, by day
- Device and referrer breakdown
- Filterable by 7, 30, 90 days, or all time
Acme Coffee clicks
1,204
By device
Prove it to sponsors
Tag episodes, see what actually drove clicks.
Attribute clicks to the exact episode they came from and hand sponsors a real leaderboard instead of a guess.
- Per-episode click attribution
- Leaderboards by brand, campaign, and episode
- Exportable reports for renewal conversations
Top episodes for Acme Coffee
Run real campaigns
Start dates, end dates, and a fallback that never 404s.
Schedule a campaign, pause it if a sponsor asks, and let it expire on its own. Listeners still land on a branded page instead of a dead link.
- Active, scheduled, paused, and expired states
- Per-link fallback URL for expired campaigns
- Discount codes shown even after a link expires
Acme Coffee
Runs through Dec 31
Nimbus VPN: Black Friday
Starts Nov 24
Trailhead Boots
Paused by sponsor
Old Gear Co
Falls back to /expired
Your back catalog becomes an asset, not a liability.
Old episodes keep earning
A listener who finds episode 12 in 2027 still lands on a live offer instead of a dead link and a lost sponsor.
Sponsors keep renewing
Show up to the renewal conversation with real per-episode click data instead of a vibe.
Pricing
One plan. Every feature.
Castmark
$19/ month
- Unlimited sponsor links
- Unlimited episodes and campaigns
- Click analytics by device, referrer, and time
- Per-episode click attribution
- Brand, campaign, and episode reports
- Branded fallback page for expired links
Cancel anytime during the trial and you won't be charged.
If you cancel, your redirect links keep working. You just lose dashboard and analytics access until you resubscribe.
FAQ
A few common questions first.
Do I have to edit my old episodes?+
Only once. Replace the sponsor's raw URL with your Castmark link in each episode's show notes. After that, you never touch old episodes again; changing the destination in Castmark updates every episode instantly.
What happens when a campaign ends?+
A link can be active, scheduled, paused, or expired based on the dates and status you set. Once it's no longer live, visitors are sent to a per-link fallback URL if you set one, or to a branded Castmark page showing the sponsor name and last known discount code instead of a dead link.
What happens to my links if I cancel?+
Your redirect links keep resolving and logging clicks even if you cancel. They're the thing your listeners depend on, so they don't stop working. Cancelling only locks you out of the dashboard and reports until you resubscribe.
Does it work with my podcast host?+
Yes. A Castmark link is just a plain URL, so it works anywhere a link works: show notes on any host, YouTube descriptions, newsletters, social posts. There's nothing to install or connect.
How does the free trial work?+
You get 14 days of full access after signing up. You'll be asked for card details up front so the subscription can start automatically when the trial ends. Cancel any time before then and you won't be charged.
Can sponsors see the analytics?+
Sponsors don't get their own login today. Pull up the reports page and share the brand, campaign, or episode leaderboard with them directly, or export the numbers for a renewal conversation.
Your next episode deserves a link that never dies.
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