Infrastructure

Revealing the machinery.

SponsorCal handles the sponsorship workflow before, during, and after publish.

Verified audience data. A calendar sponsors can trust without you. Assets collected automatically. Payouts that release themselves. Sponsor follow-through that drives repeat bookings.

Trust

Media Kit

Sponsors see verified numbers.

Your media kit is the page sponsors open before they book — one link with verified stats, past partners, and live slot availability. Verification is supported on Beehiiv and Kit only.

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Subscriber count and open rate pulled directly from Beehiiv or Kit via API — timestamped, not self-reported.

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Open rate is a weighted average across your last 25 sent campaigns. Platform-calculated, not estimated.

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On Mailchimp, Substack, or any other platform: stats cannot be verified. The Verified badge will not appear.

Subscriber countPulled from Beehiiv or Kit at verification time. Badge shows the exact date last verified. Updates only when you re-verify.
Open rateBeehiiv and Kit only. Weighted average across recent campaigns. If your platform is not supported, open rate is not shown.
API keyUsed at verification time only. Never stored server-side. Never visible to sponsors.
SponsorCal media kit showing verified subscriber count, open rate, past sponsors, and live availability

Booking

Live Inventory

Your calendar never oversells.

Slots are held the moment a sponsor starts checkout — before any payment clears.

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Capacity hold placed at checkout start, not on payment. No race conditions.

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Full slots show as full — no double-bookings possible even under simultaneous load.

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Abandoned checkouts release capacity automatically after 10 minutes.

Capacity holdCreated when sponsor initiates checkout. Expires after 10 minutes if payment is abandoned.
EnforcementCapacity is enforced during checkout. Two sponsors cannot book the same slot simultaneously.
Calendar accuracyAvailability reflects real inventory in real time. Full means full.
SponsorCal booking calendar showing live slot availability across issue dates

Delivery

Asset Pipeline

Assets arrive without chasing.

A deadline-first submission link is sent at booking. Automated reminders follow up — assets arrive without manual chasing.

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Sponsors receive a structured submission form with deadline and format requirements.

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SponsorCal sends automatic reminders — 3 days and 1 day before the deadline.

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You're notified the moment assets arrive. Approve or request changes instantly.

Asset deadlineSet to days before your issue date. Enforced automatically. Visible to the sponsor from the moment they book.
Reminder schedule3 days out, then 1 day out. Both sent automatically — no trigger required from you.
Late submission handlingTriggered automatically when assets are overdue. Request a late submission or issue a refund in one click.
SponsorCal sponsor asset submission form showing headline, copy, URL, and logo upload fields

Payments

Payout Integrity

Payouts release without reminders.

Mark as published. The 7-day dispute buffer starts. Funds release to your bank automatically — no invoice, no follow-up.

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Sponsors pay upfront at checkout. Funds are held in Stripe until you mark the booking as published.

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Publishing requires an archive URL — your permanent proof of delivery, stored against the booking and never overwritten.

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7 days after publication, payout triggers automatically. Active disputes hold the release until resolved.

Publication stepMark as published + archive URL sets the publishedAt timestamp. That timestamp starts the payout clock. No URL, no clock.
Dispute buffer7-day window from publishedAt. If a dispute is raised, the payout is held — not lost — until the dispute is resolved.
Payout triggerRuns automatically at day 7. Funds arrive in your connected bank account within 2–7 business days. No manual step required.
SponsorCal booking detail showing archive URL, payout amount, and payout timeline

Follow-Through

Sponsor Reports

The sponsor experience doesn’t end at publish.

When you publish, your sponsor receives a professional confirmation. If you have verified engagement data, they get a performance follow-up within 48 hours — with a one-click link to book again.

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Instant delivery confirmation: issue date, placement, verified subscribers, their creative reflected back, and a link to the published issue.

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Performance follow-up: your newsletter’s verified open rate sent within 48 hours, so sponsors can see the reach their ad received.

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Every email includes a rebook link. When a sponsor books again from the report, SponsorCal tracks it automatically.

Delivery confirmationSent the moment you click Confirm Published. The sponsor knows their ad is live without you sending a single manual email.
Performance contextFor creators with verified engagement data (Beehiiv or Kit), a follow-up email includes the issue’s open rate and how it compares. Unverified creators still get the delivery confirmation.
Rebook attributionEvery report links back to your booking page. When a sponsor rebooks from the email, SponsorCal records the source — so you can see which sponsorships turn into repeat business.
SponsorCal sponsor report email showing delivery confirmation with verified subscriber count, placement details, and rebook CTA

System Comparison

What changes when infrastructure handles it.

Without SponsorCal
1

Sponsor emails an inquiry

Missing budget, dates, and context.

2

Back-and-forth on rate and availability

3–5 emails minimum. Calendar conflicts happen.

3

Send an invoice and wait

Net-30 terms, if they pay at all.

4

Email sponsor to request ad copy

No deadline. No format spec. No reminder.

5

Newsletter goes out with no record

No archive. No proof of delivery.

6

Follow up again for payment

30–90 day wait. Sometimes never.

7

Sponsor never hears from you again

No confirmation. No performance data. No reason to rebook.

With SponsorCal
1

Sponsor opens your booking page

No email. No DM. Fully self-serve.

2

Verified stats build trust instantly

Real subscriber count. Real open rate.

3

Sponsor books and pays upfront

Card charged at checkout. Slot held immediately.

4

Asset reminders sent automatically

3 days out, then 1 day out.

5

You publish — archive URL recorded

Proof of delivery stored permanently.

6

Payout arrives on day 7

No invoice. No follow-up. Done.

7

Sponsor receives performance summary and rebooks

Automated follow-through. One-click rebook link.

Five minutes to set up.

Everything else is automatic.

Your booking page, payment infrastructure, sponsor follow-through, and payout system — live in one session.

Create your booking page

No monthly fee · No credit card required · 5% only when you earn