Book a Sponsor

Book a Sponsor helps newsletter, podcast, and YouTube creators find brands willing to sponsor their content. Users paste a link to their media, and the service scans recent sponsorships to match relevant brands, then emails those brands on the user’s behalf. The platform offers a free tier with 200 emails and paid plans starting at $19 per month, with no commission on deals. It aims to simplify sponsorship acquisition for creators and provides tools like media kits, pricing calculators, and proposal templates.

Book a Sponsor is profiled on the APIs.io network. Tagged areas include Company, Sponsorship, Newsletters, Marketing, and Software-as-a-Service.

Book a Sponsor’s developer surface includes pricing and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

16.1/100 emerging Agent 0/100 human only Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

0 APIs

Company Sponsorship Newsletters Marketing Software-as-a-Service

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 16.1/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 9.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.2 / 9

Regulatory Posture 1.8 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/bookasponsor-com/apis.yml: open an issue on github.com/api-evangelist/bookasponsor-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Book a Sponsor API pricing

Prices published by Book a Sponsor, read 2026-11-02 from bookasponsor.com/pricing.

Plan	Price
Starter	$19 a month
Kit	$49 a month
Growth	$99 a month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Bookasponsor Com Plans Pricing

3 plans

PLANS

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Bookasponsor Com Domain Security

TLSv1.3

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 2

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Newsroom

Newsroom

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: bookasponsor-com
name: Book a Sponsor
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: low
  probe_state: none
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://bookasponsor.com/assets/og/video-poster.jpg
description: Book a Sponsor helps newsletter, podcast, and YouTube creators find brands willing to sponsor their content.
  Users paste a link to their media, and the service scans recent sponsorships to match relevant brands, then emails those
  brands on the user’s behalf. The platform offers a free tier with 200 emails and paid plans starting at $19 per month, with
  no commission on deals. It aims to simplify sponsorship acquisition for creators and provides tools like media kits, pricing
  calculators, and proposal templates.
url: https://artifacts.apis.io/bookasponsor-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-02 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-02'
modified: '2026-11-02'
x-coverage:
  state: none
  reason: no-developer-program
  detail: No public API documentation or machine‑readable contract was found on the provider’s site.
  evidence:
  - url: https://bookasponsor.com/
    status: 200
  checked: '2026-11-02'
tags:
- Company
- Sponsorship
- Newsletters
- Marketing
- Software-as-a-Service
tags_raw:
- Company
- Sponsorship
- Newsletter
- Marketing
- SaaS
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/bookasponsor-com-plans-pricing.yml
- type: LLMsTxt
  url: llms/bookasponsor-com-llms.txt
- type: Hosts
  url: hosts/bookasponsor-com-hosts.yml
- type: TrustCenter
  url: https://bookasponsor.com/sponsors/vanta.com
- type: TermsOfService
  url: https://bookasponsor.com/terms
- type: PrivacyPolicy
  url: https://bookasponsor.com/privacy
- type: Pricing
  url: https://bookasponsor.com/pricing
- type: Newsroom
  url: https://bookasponsor.com/sponsors/niche/media
- type: Login
  url: https://bookasponsor.com/login
- type: DomainSecurity
  url: security/bookasponsor-com-domain-security.yml
- type: Website
  url: https://bookasponsor.com/
apis: []
x-enrichment:
  date: '2026-11-02'
  status: enriched
  artifacts_added: 10
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Book a Sponsor API — frequently asked questions

How much does the Book a Sponsor API cost?

Book a Sponsor publishes its prices; its Starter plan is $19 a month as of 2026-11-02. APIs.io lists 3 pricing plans for Book a Sponsor, with each plan's price, limits and inclusions under Pricing on this page.

Is the Book a Sponsor API ready for AI agents?

Book a Sponsor has a Kin Score of 16.1 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-06.

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