Infrastructure

Revealing the machinery.

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

Verified audience data. A calendar sponsors can book from without emailing you. Assets collected automatically. Sponsor payments landing in your own Stripe account. Sponsor follow-through with a one-click rebook link.

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 and 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 from the moment a sponsor starts checkout.

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The slot is held the moment a sponsor starts checkout, before they reach the payment page.

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When two sponsors start checkout for the last slot at the same moment, only one reservation is created. The slot cannot be sold twice.

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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 is recalculated from live inventory every time the page loads. 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, followed by automated reminders on a fixed schedule.

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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 deadlineYou choose 1 to 7 days before your issue date. The default is 3. Enforced automatically, and visible to the sponsor from the moment they book.
Reminder schedule3 days out, then 1 day out. Both sent automatically, with 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

The money is yours from the booking.

Your 95% is transferred into your own Stripe account as part of the sponsor's payment — not into a SponsorCal balance you have to claim. No invoice, no follow-up.

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Sponsors pay upfront at checkout, and your 95% moves into your own Stripe account as part of that payment. Publishing releases nothing, because nothing is being withheld.

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Publishing requires an archive URL. It's stored against the booking, never overwritten, and stands as your proof of delivery.

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Moving the money on to your bank runs through Stripe, on Stripe's timing and your account's status — not on a date SponsorCal sets.

Publication stepMark as published + archive URL sets the publishedAt timestamp. That timestamp is your proof of delivery and the anchor for sponsor reporting. No URL, no publish.
DisputesSponsorCal records the dispute and attempts to email you the booking details. If an archive URL is already on file the email includes it; otherwise that notification carries no archive evidence, and publishing later does not send another. Stripe handles the case, and it does not freeze money SponsorCal is not holding.
Where the money sitsYour 95% is transferred into your own Stripe account as part of the sponsor's payment. SponsorCal never holds it and sets no date for moving it to your bank; that runs through Stripe.

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.

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.

7

No contact after the issue goes out

No confirmation. No performance data.

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 with an archive URL

Proof of delivery stored permanently.

6

Your 95% is already in your Stripe account

No invoice. No follow-up.

7

Sponsor receives performance summary and rebooks

Automated follow-through. One-click rebook link.

Set up once.

Everything else is automatic.

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

Create your booking page

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