Anthra

Anthra is an agentic AI book creator that helps users plan, write, illustrate, and narrate their books. The platform provides AI-driven tools for drafting chapters, generating artwork, creating lifelike narration, and publishing both ebook and print formats. Users can collaborate with the AI co-author, customize story elements, and export finished books as illustrated e‑books, audiobooks, or print‑ready PDFs. Anthra offers a free starter tier and paid plans for advanced features, targeting authors, educators, and creators seeking AI‑enhanced storytelling.

Anthra is listed with 1 API on the APIs.io network. Tagged areas include Artificial Intelligence, BookCreation, Writing, Illustration, and Audiobook.

The Anthra catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Anthra’s developer surface includes authentication, pricing, changelog, documentation, API reference, getting-started guide, support, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

36.1/100 thin Agent 30/100 agent ready Heartbeat 83/100 alive Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 API 1 MCP Servers

Artificial IntelligenceBookCreationWriting Illustration Audiobook

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 36.1/100 · thin

Contract Quality 2.3 / 21

Developer Ergonomics 9.2 / 17

Access Clarity 7.6 / 17

Operational Transparency 1.7 / 11

Contract Governance 2.2 / 10

Discoverability 5.5 / 9

Regulatory Posture 4.8 / 15

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 0 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

4 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 10.7 — up to +22.3 composite points
Access Clarity scores 44.7 — up to +11.1 composite points
Operational Transparency scores 15.8 — up to +10.9 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/anthra-com/apis.yml: open an issue on github.com/api-evangelist/anthra-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 →

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Anthra API

Programmatic access to Anthra API as documented.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Anthra MCP Server

Remote MCP server at anthra.com.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Anthra Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Anthra Com Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Anthra Com Context

3 classes · 31 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Anthra API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Anthra Com Authentication

3 schemes

SECURITY

Anthra Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Anthra Com Scopes

6 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Anthra Com Agentic Access

1 operation

1 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: anthra-com
name: Anthra
description: Anthra is an agentic AI book creator that helps users plan, write, illustrate, and narrate their books. The platform
  provides AI-driven tools for drafting chapters, generating artwork, creating lifelike narration, and publishing both ebook
  and print formats. Users can collaborate with the AI co-author, customize story elements, and export finished books as illustrated
  e‑books, audiobooks, or print‑ready PDFs. Anthra offers a free starter tier and paid plans for advanced features, targeting
  authors, educators, and creators seeking AI‑enhanced storytelling.
url: https://artifacts.apis.io/anthra-com/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: gated
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-02'
  method: derived
image: https://anthra.com/og.png
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Artificial Intelligence
- BookCreation
- Writing
- Illustration
- Audiobook
tags_raw:
- AI
- BookCreation
- Writing
- Illustration
- Audiobook
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/anthra-com-agentic-access.yml
- type: Spectral
  url: rules/anthra-com-rules.yml
- type: JSONLD
  url: json-ld/anthra-com-context.jsonld
- type: Vocabulary
  url: vocabulary/anthra-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/anthra-com-data-model.yml
- type: Authentication
  url: authentication/anthra-com-authentication.yml
- type: OAuthScopes
  url: scopes/anthra-com-scopes.yml
- type: ErrorCatalog
  url: errors/anthra-com-problem-types.yml
- type: Conformance
  url: conformance/anthra-com-conformance.yml
- type: LLMsTxt
  url: llms/anthra-com-llms.txt
- type: MCPServer
  url: mcp/anthra-com-mcp.yml
- type: WellKnown
  url: well-known/anthra-com-well-known.yml
- type: Hosts
  url: hosts/anthra-com-hosts.yml
- type: Vendors
  url: vendors/anthra-com-vendors.yml
- type: Pricing
  url: https://anthra.com/pricing
- type: ChangeLog
  url: https://anthra.com/changelog
- type: DomainSecurity
  url: security/anthra-com-domain-security.yml
- type: Website
  url: https://anthra.com/
- type: Documentation
  url: https://anthra.com/docs
- type: APIReference
  url: https://anthra.com/docs/api/books
- type: GettingStarted
  url: https://anthra.com/docs/quickstart
- type: Support
  url: https://anthra.com/contact
- type: Blog
  url: https://anthra.com/blog
- type: TermsOfService
  url: https://anthra.com/terms
- type: PrivacyPolicy
  url: https://anthra.com/privacy
- type: SignUp
  url: https://anthra.com/signup
apis:
- name: Anthra API
  description: Programmatic access to Anthra API as documented.
  humanURL: https://anthra.com/docs/api/books
  baseURL: https://anthra.com/api/v1
  aid: anthra-com:anthra-api
  properties:
    x-provenance: provider-hosted
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-11-01'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://anthra.com/api/mcp
    status: 401
  - url: https://anthra.com/
    status: 200
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 28
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Anthra API — frequently asked questions

Does Anthra have an API?

Yes. APIs.io lists 1 API from Anthra, including Anthra API.

How do I authenticate with the Anthra API?

Anthra documents its authentication (3 schemes). The details are profiled on APIs.io as Anthra Com Authentication.

Does Anthra have an MCP server?

Yes. APIs.io lists 1 MCP server for Anthra: Remote MCP server at anthra.com.

Is the Anthra API ready for AI agents?

Anthra has a Kin Score of 36.1 out of 100 (thin) and an Agent Readiness score of 30.0 (agent-ready), scored by API Evangelist on 2026-11-02.

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