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.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles Callisto Media the way a machine reads it — 1 machine-readable artifact, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Callisto Media scores 6.9/100 (minimal), with a separate agent-readiness read of 4/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
Put this on your own site. The badge is drawn live from Callisto Media's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/callisto-media/"
title="Callisto Media on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/callisto-media.svg"
alt="Callisto Media Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/callisto-media/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/callisto-media/"
title="Callisto Media on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/callisto-media/card.svg"
alt="Callisto Media Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Callisto Media
Each block below is one kind of artifact we hold for Callisto Media. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Callisto Media — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Access & Security 1
Authentication, authorization, and security posture
Company 4
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/callisto-media · machine-readable index on apis.io
This is an independent, third-party profile of Callisto Media, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.