Callisto Media

Callisto Media Inc. was a data-driven nonfiction book publisher founded in 2011 by chief executive Benjamin Wayne, operating from 1955 Broadway in Oakland, California (earlier Emeryville) and 220 West 19th Street in New York. It built a publishing model around demand signals rather than editorial instinct — mining point-of-sale data, search volume and category gaps to decide which instructional titles to commission, then matching each topic to a subject-matter author. Its primary imprint was Rockridge Press, best known for diet-, appliance- and condition-specific cookbooks and health titles, alongside the Callisto Kids line of pre-K through grade 12 workbooks, STEM, history and biography titles; the company said it had reached more than 50 million customers and ranked among the top fifteen US publishers by unit sales. It raised venture funding from 137 Ventures in 2017, then contracted sharply — cutting 35 percent of staff in July 2022 and a further 200 roles that October — and on 9 May 2023 its publishing assets were acquired by the independent publisher Sourcebooks in a deal funded by Penguin Random House, with Simon & Schuster Distribution Services continuing to distribute the titles. The brand now trades as Callisto Publishing, a Sourcebooks imprint: callistomedia.com 301-redirects to callistopublishing.com, which 301-redirects again to sourcebooks.com/callisto (chain verified 2026-08-02). Callisto Media is a consumer publishing business, not a software vendor, and has no public API surface. Probes on 2026-08-02 against callistomedia.com, www.callistopublishing.com and www.sourcebooks.com returned no machine-readable contract: /openapi.json, /swagger.json and /.well-known/ai-plugin.json all 404, /.well-known/agent-card.json and /.well-known/agent.json both 404 (no A2A agent card), and every other probed path answered with the Sourcebooks single-page Magento storefront shell rather than a document. There is no developer portal, no GitHub organization (callistomedia, callisto-media and rockridgepress all 404 on the GitHub API), no published SDK on npm or PyPI, and no llms.txt.

Callisto Media is profiled on the APIs.io network. Tagged areas include Company, Publishing, Book Publishing, Educational Publishing, and Children’s Books.

🌐 Visit website 📡 Source on GitHub

5.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

0 APIs

Company PublishingBook PublishingEducational PublishingChildren's BooksNonfictionMedia Consumer ProductsData-Driven PublishingAcquired United States

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 5.7/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 5.7 / 10

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

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.

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 github.com/api-evangelist/callisto-media: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

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

Callisto Media Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 4

The organization behind the API

Website

Website

LinkedIn

Crunchbase

Crunchbase

Press

Press

Other 1

Properties that don't map to a standard resource type

SecondaryMarket

SecondaryMarket

Source (apis.yml)

aid: callisto-media
name: Callisto Media
description: 'Callisto Media Inc. was a data-driven nonfiction book publisher founded in 2011 by chief executive Benjamin
  Wayne, operating from 1955 Broadway in Oakland, California (earlier Emeryville) and 220 West 19th Street in New York. It
  built a publishing model around demand signals rather than editorial instinct — mining point-of-sale data, search volume
  and category gaps to decide which instructional titles to commission, then matching each topic to a subject-matter author.
  Its primary imprint was Rockridge Press, best known for diet-, appliance- and condition-specific cookbooks and health titles,
  alongside the Callisto Kids line of pre-K through grade 12 workbooks, STEM, history and biography titles; the company said
  it had reached more than 50 million customers and ranked among the top fifteen US publishers by unit sales. It raised venture
  funding from 137 Ventures in 2017, then contracted sharply — cutting 35 percent of staff in July 2022 and a further 200
  roles that October — and on 9 May 2023 its publishing assets were acquired by the independent publisher Sourcebooks in a
  deal funded by Penguin Random House, with Simon & Schuster Distribution Services continuing to distribute the titles. The
  brand now trades as Callisto Publishing, a Sourcebooks imprint: callistomedia.com 301-redirects to callistopublishing.com,
  which 301-redirects again to sourcebooks.com/callisto (chain verified 2026-08-02). Callisto Media is a consumer publishing
  business, not a software vendor, and has no public API surface. Probes on 2026-08-02 against callistomedia.com, www.callistopublishing.com
  and www.sourcebooks.com returned no machine-readable contract: /openapi.json, /swagger.json and /.well-known/ai-plugin.json
  all 404, /.well-known/agent-card.json and /.well-known/agent.json both 404 (no A2A agent card), and every other probed path
  answered with the Sourcebooks single-page Magento storefront shell rather than a document. There is no developer portal,
  no GitHub organization (callistomedia, callisto-media and rockridgepress all 404 on the GitHub API), no published SDK on
  npm or PyPI, and no llms.txt.'
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-09-02'
  method: derived
image: https://web.archive.org/web/20230316111229im_/https://www.callistomedia.com/content/uploads/2018/12/logo-2.png
url: https://raw.githubusercontent.com/api-evangelist/callisto-media/refs/heads/main/apis.yml
x-api-posture: no-product-api
x-api-posture-basis: observed
x-api-posture-note: Callisto Media is a consumer publishing business, not a software vendor, and has no public API surface.
x-type: company
x-source: harvest:secondary-market
x-secondary-market-listing: https://forgeglobal.com/callisto-media_stock/
x-archived-website: https://web.archive.org/web/20230316111229/https://www.callistomedia.com/
x-successor: Callisto Publishing, an imprint of Sourcebooks (assets acquired 2023-05-09)
x-tier: stub
x-tier-reason: no-public-api-surface
x-enrichment:
  date: '2026-08-02'
  status: minimal
  artifacts_added: 3
  pass: local-v1
specificationVersion: '0.23'
created: '2026-08-02'
modified: '2026-08-02'
tags:
- Company
- Publishing
- Book Publishing
- Educational Publishing
- Children's Books
- Nonfiction
- Media
- Consumer Products
- Data-Driven Publishing
- Acquired
- United States
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/callisto-media-domain-security.yml
- type: WellKnown
  url: well-known/callisto-media-well-known.yml
- type: LLMsTxt
  url: llms/callisto-media-llms.txt
- type: Website
  url: https://www.sourcebooks.com/callisto/
- type: LinkedIn
  url: https://www.linkedin.com/company/callisto-media
- type: Crunchbase
  url: https://www.crunchbase.com/organization/callisto-media
- type: Press
  url: https://www.prnewswire.com/news-releases/callisto-media-to-join-leading-independent-publisher-sourcebooks-301820039.html
- type: SecondaryMarket
  url: https://forgeglobal.com/callisto-media_stock/

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