Featherless AI

Featherless AI is a serverless LLM inference platform that serves thousands of open-weight models from the Hugging Face catalog behind a single OpenAI-compatible REST API. It uses flat monthly subscription pricing with unlimited tokens rather than per-token billing, exposing chat completions, text completions, an embeddings endpoint, and a large models catalog.

Featherless AI publishes 4 APIs on the APIs.io network, including Chat API, Completions API, Embeddings API, and 1 more. Tagged areas include Artificial Intelligence, LLM, Inference, Serverless, and Open Models.

The Featherless AI catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Featherless AI’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

42.2/100 developing ▬ flat Agent 21/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessPaid

1 APIs

Artificial Intelligence LLM Inference ServerlessOpen Models

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 42.2/100 · developing

Contract Quality 14.3 / 23

Developer Ergonomics 5.8 / 18

Access Clarity 7.1 / 18

Operational Transparency 4.0 / 12

Contract Governance 1.2 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · 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 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 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.

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/featherless: 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 →

APIs 4

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

Featherless AI Chat API

OpenAI-compatible chat completions.

Featherless AI Completions API

OpenAI-compatible legacy text completions.

Featherless AI Embeddings API

OpenAI-compatible text embeddings.

Featherless AI Models API

Model catalog discovery.

Open Collections 6

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

API Collection

OPEN COLLECTION

Featherless AI Chat API

OPEN COLLECTION

Featherless AI Chat Completions API

OPEN COLLECTION

Featherless AI Chat Embeddings API

OPEN COLLECTION

Featherless AI Chat Models API

OPEN COLLECTION

Featherless AI API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Featherless Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Featherless Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Featherless Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Featherless AI Chat Completions Streaming (HTTP + SSE)

AsyncAPI 2.6 description of Featherless AI's **chat completion streaming** surface. Featherless AI's core inference API is OpenAI-compatible and does not publish a WebSocket API...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Featherless AI API Rules

5 rules · 1 errors 4 warnings

SPECTRAL

Security Posture 2

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

Featherless Authentication

http · 1 scheme

SECURITY

Featherless Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Featherless Agentic Access

4 operations · 3 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

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 2

Authentication, authorization, and security posture

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

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: featherless
url: https://raw.githubusercontent.com/api-evangelist/featherless/refs/heads/main/apis.yml
name: Featherless AI
kind: company
description: Featherless AI is a serverless LLM inference platform that serves thousands of open-weight models from the Hugging
  Face catalog behind a single OpenAI-compatible REST API. It uses flat monthly subscription pricing with unlimited tokens
  rather than per-token billing, exposing chat completions, text completions, an embeddings endpoint, and a large models catalog.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/featherless.png
tags:
- Artificial Intelligence
- LLM
- Inference
- Serverless
- Open Models
tags_raw:
- AI
- LLM
- Inference
- Serverless
- Open Models
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: featherless:featherless-chat-api
  name: Featherless AI Chat API
  description: OpenAI-compatible chat completions.
  humanURL: https://featherless.ai/docs/completions
  baseURL: https://api.featherless.ai/v1
  tags:
  - Chat
  properties:
  - type: OpenAPI
    url: openapi/featherless-chat-api-openapi.yml
  - type: Documentation
    url: https://featherless.ai/docs/completions
  - type: APIReference
    url: https://featherless.ai/docs/api-examples-and-snippets
  - type: AsyncAPI
    url: asyncapi/featherless-asyncapi.yml
  - type: Postman
    url: collections/featherless.postman_collection.json
  - type: Documentation
    url: https://featherless.ai/docs/quickstart-guide
  - type: Documentation
    url: https://featherless.ai/docs/embeddings
- aid: featherless:featherless-completions-api
  name: Featherless AI Completions API
  description: OpenAI-compatible legacy text completions.
  humanURL: https://featherless.ai/docs/completions
  baseURL: https://api.featherless.ai/v1
  tags:
  - Completions
  properties:
  - type: OpenAPI
    url: openapi/featherless-completions-api-openapi.yml
  - type: Documentation
    url: https://featherless.ai/docs/completions
  - type: APIReference
    url: https://featherless.ai/docs/api-examples-and-snippets
  - type: AsyncAPI
    url: asyncapi/featherless-asyncapi.yml
  - type: Postman
    url: collections/featherless.postman_collection.json
  - type: Documentation
    url: https://featherless.ai/docs/quickstart-guide
  - type: Documentation
    url: https://featherless.ai/docs/embeddings
- aid: featherless:featherless-embeddings-api
  name: Featherless AI Embeddings API
  description: OpenAI-compatible text embeddings.
  humanURL: https://featherless.ai/docs/completions
  baseURL: https://api.featherless.ai/v1
  tags:
  - Embeddings
  properties:
  - type: OpenAPI
    url: openapi/featherless-embeddings-api-openapi.yml
  - type: Documentation
    url: https://featherless.ai/docs/completions
  - type: APIReference
    url: https://featherless.ai/docs/api-examples-and-snippets
  - type: AsyncAPI
    url: asyncapi/featherless-asyncapi.yml
  - type: Postman
    url: collections/featherless.postman_collection.json
  - type: Documentation
    url: https://featherless.ai/docs/quickstart-guide
  - type: Documentation
    url: https://featherless.ai/docs/embeddings
- aid: featherless:featherless-models-api
  name: Featherless AI Models API
  description: Model catalog discovery.
  humanURL: https://featherless.ai/docs/completions
  baseURL: https://api.featherless.ai/v1
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/featherless-models-api-openapi.yml
  - type: Documentation
    url: https://featherless.ai/docs/completions
  - type: APIReference
    url: https://featherless.ai/docs/api-examples-and-snippets
  - type: AsyncAPI
    url: asyncapi/featherless-asyncapi.yml
  - type: Postman
    url: collections/featherless.postman_collection.json
  - type: Documentation
    url: https://featherless.ai/docs/quickstart-guide
  - type: Documentation
    url: https://featherless.ai/docs/embeddings
common:
- type: AgenticAccess
  url: agentic-access/featherless-agentic-access.yml
- type: DomainSecurity
  url: security/featherless-domain-security.yml
- type: Authentication
  url: authentication/featherless-authentication.yml
- type: GitHubOrganization
  url: https://github.com/featherless-ai
- type: LinkedIn
  url: https://www.linkedin.com/company/featherless-ai
- type: Website
  url: https://featherless.ai/
- type: Documentation
  url: https://featherless.ai/docs/quickstart-guide
- type: Plans
  url: plans/featherless-plans-pricing.yml
- type: RateLimits
  url: rate-limits/featherless-rate-limits.yml
- type: FinOps
  url: finops/featherless-finops.yml
- url: https://featherless.ai/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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