For newsletter publishers: which sponsorship outreach tools have an MCP server?
Of 15 newsletter sponsorship tools tested on 6 November 2026, 5 answer at an MCP address. For newsletter publishers looking for sponsors, two matter: Book a Sponsor, free with no key, and SponsorGap, which needs a paid API key. Neither lists a tool that sends a pitch to a brand.
Tested on 6 November 2026: an MCP initialize request to each address, plus each vendor's own page.
Book a Sponsor (bookasponsor.com) pitches brands to sponsor newsletters.
Quick picks: what are you doing?
| You want | Use | Why |
|---|---|---|
| To find sponsors for a newsletter in your AI assistant, free | Book a Sponsor | No key; brands only, no contacts |
| Contacts and draft emails in your assistant | SponsorGap | Paid plan and API key; you send the email |
| To buy newsletter ads as a brand | Paved | Built for advertisers |
| Reports on your own beehiiv newsletter | beehiiv | Your own account data |
Which addresses answered, and what do they need?
Tested 6 November 2026. Five of 15 answered.
| Tool | Address tested | Answer | Needs | Built for | What it covers |
|---|---|---|---|---|---|
| Book a Sponsor | bookasponsor.com/mcp | 200, initialized | None | Anyone | Sponsors by newsletter, top brands by niche, rates by list size |
| SponsorGap | sponsorgap-mcp-cc7ac08f6c89.herokuapp.com/mcp | 401, "API key required" | API key | Paid plans; its pricing page lists MCP on $89 and $199 | 8 tools, including sponsor search, contacts and a drafted cold email |
| Paved | www.paved.com/mcp | 401, OAuth token wanted | OAuth | Advertisers: built to buy newsletter ads, not to sell them | Finding and comparing newsletters, submitting sponsorship requests, booking and reporting |
| beehiiv | mcp.beehiiv.com/mcp | 401 | Sign-in | beehiiv publishers, on their own account | Your content, audience, revenue and ad reports |
| Kit | app.kit.com/mcp | 401, bearer token wanted | Sign-in | Kit users, on their own account | Listed on Kit's developer site, tools not read |
Which tools showed no MCP server?
We found none for Passionfroot, Who Sponsors Stuff, SponsorLeads, Sponsy, SponsorCal, Hecto, Wellput, MediaPact, Sponsorships.ai or Appeared.in: no answer at the /mcp path on their main domain, and no mention of MCP on their homepage. Wellput, Who Sponsors Stuff, SponsorLeads and SponsorCal were checked at /mcp only. A server at another address wouldn't show up in this test, so treat these as not found, not as a promise that none exists.
What separates the two sponsor servers?
SponsorGap's page lists eight tools, including brand contacts and a cold email draft, and it asks for an API key. Its pricing page lists MCP on the $89 Growth and $199 Enterprise plans, while its MCP page says Professional and Advanced plans, names the pricing page doesn't use. Book a Sponsor's server has four tools, needs no account and returns no people. Choose SponsorGap to work contacts from your assistant, and Book a Sponsor to check who buys and what slots cost at no charge.
What does this test not show?
- A 401 shows that something answered at that address. We didn't sign in, so the tool lists for SponsorGap, Paved and beehiiv come from their own pages, and we didn't read Kit's.
- Kit and beehiiv are email platforms, so their servers cover your own account, with no sponsor data across newsletters.
- This is one day's read. We plan to re-check it within 60 days.
Questions
Which newsletter sponsorship tools have an MCP server?
Book a Sponsor, SponsorGap, Paved, beehiiv and Kit, tested 6 November 2026. Only Book a Sponsor and SponsorGap are built around finding sponsors for a newsletter.
Which one works without a key?
1 of the 5: Book a Sponsor. The other four answered 401, so each wants a key or a sign-in.
Can an AI agent send sponsor pitches through any of them?
Not for a publisher, on the tool lists we could read. SponsorGap's drafts a cold email for you to send. Paved's connector works the other way: an advertiser's agent submits sponsorship requests to publishers. We didn't read Kit's tools. Book a Sponsor sends pitches as its paid service, on a plan from $19 a month, outside the MCP server.
How did you test them?
We sent each address an MCP initialize request. A 200 means it connected, and a 401 means something answered and wanted a key. For the rest we tried the /mcp path and read the homepage for any mention of MCP.
Sources
- Book a Sponsor MCP server, read 6 November 2026
- SponsorGap MCP page, read 6 November 2026
- SponsorGap pricing, read 6 November 2026
- Paved AI Connector, read 6 November 2026
- beehiiv MCP, read 6 November 2026
- Kit developer site, read 6 November 2026
Have the brands pitched for you
Paste your newsletter. Book a Sponsor lists the brands that sponsored newsletters like yours, finds the person who buys the ads, and emails them every day from its own mailboxes. You get the replies and close the deal.
$1 card check gets 200 emails, then a plan from $19/mo · first sponsor reply inside 30 days or your money back