Sleeper

Sleeper is a fantasy sports platform — a mobile-first app for creating and managing fantasy football, basketball, and other sports leagues with chat, drafts, waivers, and real-time scoring built in. Sleeper publishes a free, read-only HTTP API at api.sleeper.app that exposes public fantasy data: users, leagues, rosters, matchups, transactions, drafts, draft picks, traded picks, trending players, and the current sport/season state. The API requires no API token or OAuth because no content can be modified through it; every endpoint is a GET request returning JSON, and callers are asked to stay under 1,000 requests per minute to avoid IP blocks. Sleeper is backed by a16z and General Catalyst.

Sleeper publishes 8 APIs on the APIs.io network, including Drafts API, Leagues API, Matchups API, and 5 more. Tagged areas include Company, Fantasy Sports, Sports, Fantasy Football, and Gaming.

Sleeper’s developer surface includes documentation, API reference, signup flow, support, engineering blog, authentication, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub
41.3/100 thin ▬ flat Agent 55/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5
8 APIs 1 MCP Servers
CompanyFantasy SportsSportsFantasy FootballGamingSports DataLeaguesConsumer

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 41.3/100 · thin
Contract Quality 13.2 / 25
Developer Ergonomics 11.3 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 55/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
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 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
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/sleeper: 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 8

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

Sleeper Drafts API

The Drafts API from Sleeper — 6 operation(s) for drafts.

Sleeper Leagues API

The Leagues API from Sleeper — 4 operation(s) for leagues.

Sleeper Matchups API

The Matchups API from Sleeper — 1 operation(s) for matchups.

Sleeper Players API

The Players API from Sleeper — 2 operation(s) for players.

Sleeper Playoffs API

The Playoffs API from Sleeper — 2 operation(s) for playoffs.

Sleeper State API

The State API from Sleeper — 1 operation(s) for state.

Sleeper Transactions API

The Transactions API from Sleeper — 1 operation(s) for transactions.

Sleeper Users API

The Users API from Sleeper — 1 operation(s) for users.

Scroll for all 8

MCP Servers 1

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

sleeper-mcp.yml

MCP SERVER

Security Posture 2

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

Sleeper Authentication

none · 0 schemes

SECURITY

Sleeper Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 1

SDKs, sample code, and the tooling you integrate with

Packages
Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Blog
Blog

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: sleeper
name: Sleeper
description: 'Sleeper is a fantasy sports platform — a mobile-first app for creating and managing fantasy football, basketball,
  and other sports leagues with chat, drafts, waivers, and real-time scoring built in. Sleeper publishes a free, read-only
  HTTP API at api.sleeper.app that exposes public fantasy data: users, leagues, rosters, matchups, transactions, drafts, draft
  picks, traded picks, trending players, and the current sport/season state. The API requires no API token or OAuth because
  no content can be modified through it; every endpoint is a GET request returning JSON, and callers are asked to stay under
  1,000 requests per minute to avoid IP blocks. Sleeper is backed by a16z and General Catalyst.'
url: https://raw.githubusercontent.com/api-evangelist/sleeper/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- general-catalyst
x-tier: profiled
x-tier-reason: has-public-api
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
image: https://sleepercdn.com/images/v2/icons/app_icon_web.png
tags:
- Company
- Fantasy Sports
- Sports
- Fantasy Football
- Gaming
- Sports Data
- Leagues
- Consumer
apis:
- aid: sleeper:sleeper-drafts-api
  name: Sleeper Drafts API
  description: The Drafts API from Sleeper — 6 operation(s) for drafts.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - Drafts
  properties:
  - type: OpenAPI
    url: openapi/sleeper-drafts-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
- aid: sleeper:sleeper-leagues-api
  name: Sleeper Leagues API
  description: The Leagues API from Sleeper — 4 operation(s) for leagues.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - Leagues
  properties:
  - type: OpenAPI
    url: openapi/sleeper-leagues-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
- aid: sleeper:sleeper-matchups-api
  name: Sleeper Matchups API
  description: The Matchups API from Sleeper — 1 operation(s) for matchups.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - Matchups
  properties:
  - type: OpenAPI
    url: openapi/sleeper-matchups-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
- aid: sleeper:sleeper-players-api
  name: Sleeper Players API
  description: The Players API from Sleeper — 2 operation(s) for players.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - Players
  properties:
  - type: OpenAPI
    url: openapi/sleeper-players-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
- aid: sleeper:sleeper-playoffs-api
  name: Sleeper Playoffs API
  description: The Playoffs API from Sleeper — 2 operation(s) for playoffs.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - Playoffs
  properties:
  - type: OpenAPI
    url: openapi/sleeper-playoffs-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
- aid: sleeper:sleeper-state-api
  name: Sleeper State API
  description: The State API from Sleeper — 1 operation(s) for state.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - State
  properties:
  - type: OpenAPI
    url: openapi/sleeper-state-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
- aid: sleeper:sleeper-transactions-api
  name: Sleeper Transactions API
  description: The Transactions API from Sleeper — 1 operation(s) for transactions.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/sleeper-transactions-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
- aid: sleeper:sleeper-users-api
  name: Sleeper Users API
  description: The Users API from Sleeper — 1 operation(s) for users.
  humanURL: https://docs.sleeper.com/
  baseURL: https://api.sleeper.app/v1
  tags:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/sleeper-users-api-openapi.yml
  - type: Documentation
    url: https://docs.sleeper.com/
  - type: APIReference
    url: https://docs.sleeper.com/
common:
- type: DomainSecurity
  url: security/sleeper-domain-security.yml
- type: DeveloperPortal
  url: https://docs.sleeper.com/
- type: Documentation
  url: https://docs.sleeper.com/
- type: APIReference
  url: https://docs.sleeper.com/
- type: SignUp
  url: https://sleeper.com/
- type: Support
  url: https://support.sleeper.com/
- type: Blog
  url: https://blog.sleeper.com/
- type: TermsOfService
  url: https://sleeper.com/terms
- type: PrivacyPolicy
  url: https://sleeper.com/privacy
- type: Authentication
  url: authentication/sleeper-authentication.yml
- type: ErrorCatalog
  url: errors/sleeper-problem-types.yml
- type: Conventions
  url: conventions/sleeper-conventions.yml
- type: DataModel
  url: data-model/sleeper-data-model.yml
- type: MCPServer
  url: mcp/sleeper-mcp.yml
- type: LLMsTxt
  url: llms/sleeper-llms.txt
- type: Overlay
  url: overlays/sleeper-openapi-overlay.yaml
- type: Conformance
  url: conformance/sleeper-conformance.yml
- type: Lifecycle
  url: lifecycle/sleeper-lifecycle.yml
- type: WellKnown
  url: well-known/sleeper-well-known.yml
- type: Packages
  url: packages/sleeper-packages.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 16
  pass: local-v1
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io