Fluid

A responsive front-end framework for building flexible and adaptive web layouts.

Fluid is listed with 1 API on the APIs.io network. Tagged areas include CSS Framework, Frontend, and Responsive Design.

Fluid’s developer surface includes documentation and 10 more developer resources.

12.8/100 emerging ▬ flat Agent 1/100 human only Heartbeat 0/100 dormant self hosted · MIT Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFreemium

1 API

CSS FrameworkFrontendResponsive Design

Kin Score

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

Composite quality — 12.8/100 · emerging

Contract Quality 0.0 / 19

Developer Ergonomics 2.5 / 15

Access Clarity 1.2 / 15

Operational Transparency 2.6 / 10

Contract Governance 0.0 / 9

Discoverability 2.9 / 8

Regulatory Posture 0.0 / 15

Open Source Surface 4.0 / 10

Agent readiness — 1/100 · 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 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

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.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against 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 75 points between them, because both conditional facets apply and carry 25 points together. 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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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

12 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
Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 16.7 — up to +16.7 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/fluid/apis.yml: open an issue on github.com/api-evangelist/fluid 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 →

APIs 1

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

Fluid CSS Framework

Fluid is a CSS framework that provides a responsive grid system, UI components, and utility classes for building flexible and adaptive web layouts. It uses ITCSS architecture fo...

Pricing Plans 1

Published pricing tiers and plan structures.

Fluid Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fluid Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Fluid Finops

FINOPS

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 3

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

SDKs

SDKs

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

IssueTracker

IssueTracker

Releases

Releases

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: fluid
name: Fluid
description: A responsive front-end framework for building flexible and adaptive web layouts.
type: Index
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  generated: '2026-11-02'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fluid.png
url: https://raw.githubusercontent.com/api-evangelist/fluid/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-04-28'
specificationVersion: '0.23'
tags:
- CSS Framework
- Frontend
- Responsive Design
tags_raw:
- CSS Framework
- Front-End
- Responsive Design
apis:
- aid: fluid:fluid-css-framework
  name: Fluid CSS Framework
  description: Fluid is a CSS framework that provides a responsive grid system, UI components, and utility classes for building
    flexible and adaptive web layouts. It uses ITCSS architecture for its file and folder structure and is distributed as
    a stylesheet that can be included via CDN or npm.
  humanURL: https://github.com/fluid-framework/Fluid
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  properties:
  - type: Documentation
    url: https://github.com/fluid-framework/Fluid-docs
  - type: GitHubRepository
    url: https://github.com/fluid-framework/Fluid
  tags:
  - CSS Framework
  - Frontend
  - Grid System
  - Responsive Design
  tags_raw:
  - CSS Framework
  - Front-End
  - Grid System
  - Responsive Design
common:
- type: Plans
  url: plans/fluid-plans-pricing.yml
- type: RateLimits
  url: rate-limits/fluid-rate-limits.yml
- type: FinOps
  url: finops/fluid-finops.yml
- type: IssueTracker
  url: https://github.com/fluid-framework/Fluid/issues
- type: Releases
  url: https://github.com/fluid-framework/Fluid/releases
- type: CodeOfConduct
  url: https://github.com/fluid-framework/Fluid/blob/master/CODE_OF_CONDUCT.md
- type: License
  name: MIT
  url: https://github.com/fluid-framework/Fluid/blob/master/LICENSE
- type: Website
  url: https://github.com/fluid-framework/Fluid
- type: GitHubOrganization
  url: https://github.com/fluid-framework
- type: Documentation
  url: https://github.com/fluid-framework/Fluid-docs
- type: SDKs
  url: https://www.npmjs.com/package/fluid-css
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Fluid API — frequently asked questions

Does Fluid have an API?

Yes. APIs.io lists 1 API from Fluid, including Fluid CSS Framework.

How much does the Fluid API cost?

APIs.io lists 3 pricing plans for Fluid, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Fluid API ready for AI agents?

Fluid has a Kin Score of 12.8 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-02.

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