YouTube sponsorships have a 0.5–2% CTR. Description links get buried. Viewers convert days later with no click trail. Castlytics captures them anyway.
Tracking links, vanity URLs, promo codes, and post-purchase surveys — all four signals in one dashboard.
YouTube is one of the best channels for creator sponsorships — and one of the hardest to measure accurately.
Description link CTR on YouTube sponsorships is typically 0.5–2%. The majority of conversions never come through a link at all — viewers act on the verbal CTA.
YouTube collapses the description by default. Most viewers never expand it. Even interested buyers miss the link and go to your site by typing the URL directly.
YouTube recommends videos for weeks. A viewer might see a sponsorship today and convert 7, 14, or 30 days later — long after standard attribution windows close.
Four signals work together to capture conversions no matter how the viewer arrived.
castlytics.app/r/abc123 or links.yourbrand.com/mkbhd
Every campaign gets a unique short link. Paste it as the first link in the video description and pinned comment. Viewers who click it are attributed to that creator and video instantly.
Best for: pinned comments, description link, linktree pages
yourbrand.com/mkbhd — detected without any redirect
The creator says and shows 'yourbrand.com/mkbhd' on screen. Viewers who type that URL directly land on your site — the Castlytics script detects the path and attributes the visit to the campaign automatically. This captures the majority of YouTube conversions.
Best for: mid-roll reads, end-card CTAs, on-screen graphics
Viewer uses MKBHD20 — matched automatically to the campaign
A promo code ties the conversion back to the creator campaign even if the viewer never clicked a link and typed a different URL. Critical for long-tail conversions.
Best for: conversions that happen days or weeks after viewing
"How did you hear about us?" — matched to campaigns automatically
An optional widget on your order confirmation page captures buyers who used none of the above. Responses are auto-matched to campaigns — the final safety net for YouTube sponsorship attribution.
Best for: buyers who never clicked, visited a vanity URL, or used a promo code
YouTube conversions follow a distinct pattern. Castlytics is built to handle it.
When a sponsored video goes live, you see a sharp conversion spike in the first 48 hours as subscribers watch immediately and act on the CTA. This is the easiest window to capture — but it is only a fraction of total conversions.
YouTube's recommendation algorithm surfaces videos for weeks after upload. A viewer who discovered the video on day 18 may convert on day 22. Castlytics' 30-day attribution window captures these delayed conversions by default.
Create a campaign in under 5 minutes and get all four signals ready to hand to your creator.
Paste one script tag into your site's <head>. It detects vanity path landings and promo code redemptions automatically.
<script src="https://castlytics.app/tracker.js" data-key="YOUR_KEY" async></script>Name the campaign, enter the creator's name, set the vanity path and promo code. Castlytics generates the tracking link automatically.
// Example campaign config
{
campaign: "MKBHD Q1 2025",
creator: "Marques Brownlee",
vanityPath: "/mkbhd",
promoCode: "MKBHD20",
attributionWindow: 30 // days
}Give the creator: the tracking link for the description, the vanity URL to say on screen, and the promo code for their CTA. All four signals start working the moment the video goes live.
YouTube sponsorships have very low click-through rates — typically 0.5–2% — because viewers are watching video, not browsing. Most conversions come from viewers who typed a vanity URL directly or used a promo code at checkout later. Standard UTM tracking misses the majority.
YouTube sponsorships see a 48-hour spike after a video goes live, followed by a long tail that extends 30+ days as the algorithm keeps recommending the video. We recommend a 30-day window for most campaigns, and up to 60 days for evergreen content.
The creator says and shows 'yourbrand.com/creator' on screen and in the description. Viewers who type that URL land directly on your site. The Castlytics tracker script detects the path on page load and fires an attribution event — no redirect required.
Yes. Each creator gets their own campaign in Castlytics with a unique tracking link, vanity path, and promo code. You can run hundreds of creator campaigns simultaneously and compare performance side by side in the dashboard.
That is why vanity URLs, promo codes, and post-purchase surveys are critical. Even without a description link, viewers who type the vanity URL directly, use the promo code at checkout, or answer a post-purchase survey will still be attributed to the campaign. All four signals are independent fallbacks.
Free plan includes 3 campaigns, unlimited clicks, and 30-day attribution. No credit card required.
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