Featherless AI website screenshot

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 AI, 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
47.0/100 developing ▬ flat Agent 36/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessPaidSelf serve
4 APIs
AILLMInferenceServerlessOpen Models

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 47.0/100 · developing
Contract Quality 17.6 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 5.0 / 12
Discoverability 7.4 / 10
Agent readiness — 36/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

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 1

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

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

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
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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.
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/featherless.png
tags:
- AI
- LLM
- Inference
- Serverless
- Open Models
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.19'
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