NovelAI

NovelAI is a monthly subscription service for AI-assisted image generation, storytelling, or simply a LLM powered sandbox for your imagination.

NovelAI publishes 6 API contracts indexed on the APIs.io network, including /ai/ API, /ai/module/ API, / API, and 3 more. Tagged areas include Artificial Intelligence, Image Generation, LLM, and Storytelling.

NovelAI’s developer surface includes engineering blog, authentication, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

26.7/100 thin ▬ flat Agent 26/100 agent aware Front door AI 5/6 prominent Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Artificial Intelligence Image Generation LLM Storytelling

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Subscription Lifecycle Management

BC-4240

User Subscription

POST /user/subscription/change

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 26.7/100 · thin

Contract Quality 8.5 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 1.2 / 15

Operational Transparency 2.1 / 10

Contract Governance 0.0 / 9

Discoverability 2.9 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 3.3 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 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

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/novelai/"><img src="https://apis.io/badge/novelai/card.svg" alt="NovelAI on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

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/novelai: 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Obsidian Community Plugins (third-party APIs the Obsidian plugin ecosystem integrates)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 6

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

NovelAI API

NovelAI API provides programmatic access to AI image generation and text generation capabilities.

NovelAI /ai/ API

The /ai/ API from NovelAI — 9 operation(s) for /ai/.

NovelAI /ai/module/ API

The /ai/module/ API from NovelAI — 3 operation(s) for /ai/module/.

NovelAI / API

The / API from NovelAI — 1 operation(s) for /.

NovelAI /user/ API

The /user/ API from NovelAI — 28 operation(s) for /user/.

NovelAI /user/subscription/ API

The /user/subscription/ API from NovelAI — 2 operation(s) for /user/subscription/.

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

NovelAI Primary /ai/ /ai/ /ai/ API

OPEN COLLECTION

NovelAI Primary /ai/ /ai/ /ai/module/ API

OPEN COLLECTION

NovelAI Primary /ai/ /ai/ / API

OPEN COLLECTION

NovelAI Primary /ai/ /ai/ /user/ API

OPEN COLLECTION

NovelAI Primary /ai/ /ai/ /user/subscription/ API

OPEN COLLECTION

NovelAI Primary API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Novelai Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Novelai Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Novelai Finops

FINOPS

Security Posture 3

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

Novelai Authentication

http · 1 scheme

SECURITY

Novelai Domain Security

TLSv1.3

SECURITY

Novelai Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Novelai Agentic Access

52 operations · 35 acting · 35 human-in-the-loop

52 operations · 35 acting

AGENTIC

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Blog

Blog

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: novelai
name: NovelAI
description: NovelAI is a monthly subscription service for AI-assisted image generation, storytelling, or simply a LLM powered
  sandbox for your imagination.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/novelai.png
tags:
- Artificial Intelligence
- Image Generation
- LLM
- Storytelling
tags_raw:
- AI
- Image Generation
- LLM
- Storytelling
- Image-Generation
url: https://raw.githubusercontent.com/api-evangelist/novelai/refs/heads/main/apis.yml
created: '2024-07-02'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: novelai:novelai
  name: NovelAI API
  description: NovelAI API provides programmatic access to AI image generation and text generation capabilities.
  humanURL: https://api.novelai.net/docs/
  tags:
  - Artificial Intelligence
  - Image Generation
  - LLM
  tags_raw:
  - AI
  - Image Generation
  - LLM
  - Image-Generation
  properties:
  - type: Documentation
    url: https://api.novelai.net/docs/
- aid: novelai:novelai-ai-api
  name: NovelAI /ai/ API
  description: The /ai/ API from NovelAI — 9 operation(s) for /ai/.
  humanURL: https://api.novelai.net/docs/
  tags:
  - Artificial Intelligence
  tags_raw:
  - /ai/
  properties:
  - type: OpenAPI
    url: openapi/novelai-ai-api-openapi.yml
- aid: novelai:novelai-ai-module-api
  name: NovelAI /ai/module/ API
  description: The /ai/module/ API from NovelAI — 3 operation(s) for /ai/module/.
  humanURL: https://api.novelai.net/docs/
  tags: []
  tags_raw:
  - /ai/module/
  properties:
  - type: OpenAPI
    url: openapi/novelai-ai-module-api-openapi.yml
- aid: novelai:novelai-default-api
  name: NovelAI / API
  description: The / API from NovelAI — 1 operation(s) for /.
  humanURL: https://api.novelai.net/docs/
  tags: []
  tags_raw:
  - /
  properties:
  - type: OpenAPI
    url: openapi/novelai-default-api-openapi.yml
- aid: novelai:novelai-user-api
  name: NovelAI /user/ API
  description: The /user/ API from NovelAI — 28 operation(s) for /user/.
  humanURL: https://api.novelai.net/docs/
  tags:
  - User
  tags_raw:
  - /user/
  properties:
  - type: OpenAPI
    url: openapi/novelai-user-api-openapi.yml
- aid: novelai:novelai-user-subscription-api
  name: NovelAI /user/subscription/ API
  description: The /user/subscription/ API from NovelAI — 2 operation(s) for /user/subscription/.
  humanURL: https://api.novelai.net/docs/
  tags:
  - User Subscription
  tags_raw:
  - /user/subscription/
  properties:
  - type: OpenAPI
    url: openapi/novelai-user-subscription-api-openapi.yml
common:
- type: Plans
  url: plans/novelai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/novelai-rate-limits.yml
- type: FinOps
  url: finops/novelai-finops.yml
- url: https://novelai.net/stories
  type: Blog
- type: CapabilityMap
  url: capabilities/novelai-capability-edges.yml
  name: NovelAI Business Capability Map
- type: AgenticAccess
  url: agentic-access/novelai-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/novelai-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/novelai-domain-security.yml
- type: Authentication
  url: authentication/novelai-authentication.yml
- type: GitHubOrganization
  url: https://github.com/NovelAI
- type: LinkedIn
  url: https://www.linkedin.com/company/novelaitechnologies
- type: Website
  url: https://novelai.net/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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