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Fantasy platform · United States

Sleeper

Free read-only HTTP API for Sleeper fantasy football: users, leagues, rosters, drafts, matchups, transactions, player list and trending players. Non-commercial use only without a licence.

Facts verified against the provider's site on

Commercial use: Licence requiredBetting use: not disclosedMostly positive
Visit official siteOpen API docsCompare
Featured in:🆓 Best free sports APIs💬 Most discussed sports APIs❤️ Developer favourites🏈 Best American football APIs
64

SportDex Score

#10 of 233 sports APIs

See the full ranking →
Popularity
59

Brand demand, developer discussions, GitHub repos and videos

Community & reliability
85

Tone of public discussions, liked vs criticised points, reliability complaints; based on 25+ public discussions.

Transparency
60

Public prices, docs, terms and coverage you can check before calling sales

Developer experience
52

Free access, docs, SDKs, OpenAPI, sandbox, realtime delivery, ecosystem

Computed from public data only; uptime and latency are not measured yet. Enterprise feeds that sell by contract score lower on transparency by design. How the score works

Starting price
Not public
Free access
Free tier
Sports
1 (American football)
Live data
Not disclosed
Delivery
Polling only (REST)
Discussions
44 threads
GitHub adoption
389 repos

Best for

Hobby and community tools that read Sleeper fantasy football leagues, rosters, drafts and matchups without needing a key.

League and roster trackersDraft helpersMatchup and transaction dashboardsTrending player lists

Not ideal for

Commercial products without a licence, non-NFL sports, or anyone needing a stats feed rather than fantasy league data.

Limitations to check

  • − Commercial use requires contacting Sleeper
  • − League endpoints support NFL only
  • − Read-only access
  • − Calls should stay under about 1000 per minute or the IP can be blocked

Written from the provider's own pages (source).

Last checked 2026-11-03

Sleeper at a glance

What is Sleeper best for?
Hobby and community tools that read Sleeper fantasy football leagues, rosters, drafts and matchups without needing a key. Not ideal for: Commercial products without a licence, non-NFL sports, or anyone needing a stats feed rather than fantasy league data.
How much does Sleeper cost?
Sleeper does not publish prices on the pages we checked.
Does Sleeper have a free tier?
Yes. Sleeper lists a free plan called "Non-commercial" (1,000 requests per minute).
What does Sleeper cover?
Sleeper is a fantasy platform. Its sports: American football; data: Fantasy, Team stats.
Does Sleeper have a WebSocket or streaming API?
No streaming is listed. Sleeper delivers data by REST, so you poll for updates.
Can I use Sleeper data commercially or for betting?
According to the public terms of Sleeper — commercial use: licence required.
What do developers say about Sleeper?
Free, read-only fantasy football API widely used by hobbyists for league websites, Google Sheets exports, power rankings, draft and waiver analysis, plus wrappers in Python and Ruby and MCP servers. Easy to start with and many repos build on it. Complaints: no player scoring or projections, hard to get bench totals, non-commercial licence.
What are the alternatives to Sleeper?
Close alternatives in the SportDex catalog: Yahoo Fantasy Sports API, Ball Ranks, Fantasy Nerds API, FantasyPros API, SportsDataIO.

Commercial decision

Pricing & plan limits

PlanPriceRequestsWhat's included
Non-commercialFree1,000 / minuteFree, no token; stay under about 1000 calls/minute to avoid IP blocksource
Commercial licenceContact sales—Contact Sleeper to discuss licensingsource

Docs say only NFL supported for league endpoints. Fantasy-league data rather than a game stats feed.

Before choosing a paid plan, confirm

• What counts as one request (per call, per market, per region?)

• What happens when you exceed the quota: blocked or billed

• Whether live and historical data are on your plan

• Whether your use (public app, betting, resale) is licensed

The critical question

Data coverage

Sports
American football
Data types
FantasyTeam stats
Key competitions
NFLsource
Competitions
Not disclosed
Live / in-play
Not disclosed
Women's competitions
Not disclosed
Betting markets
Not disclosed
Bookmaker regions
Not disclosed
Bookmakers
Not disclosed
History depth
Not disclosed
Update frequency
Not disclosed
Name languages
Not disclosed
ID mapping
Not disclosed

Coverage often depends on the plan; confirm the exact league and season on your plan.

Before you build

Usage rights & access

Commercial use
Licence requiredsource
Betting products
Not disclosed
Redistribution
Not disclosed
Storing data
Not disclosed
Attribution
Not disclosed
Logos & photos
Not disclosed
Who can buy
Individualssource
Verification (KYC)
Not disclosed
Not available in
Not disclosed
Only available in
Not disclosed

Developer-ready evaluation

Integration & documentation

Protocols
REST
Formats
JSON
Authentication
none
SDKs
Not disclosed
OpenAPI spec
Not disclosed
Claimed latency
Not disclosed
Status page
Not disclosed
Sandbox / test keys
Not disclosed
Support
Not disclosed
SLA uptime
Not disclosed
Preview brief
# Integration brief: Sleeper

Goal: build a feature on Sleeper data. Use only the official documentation below as the source of truth.

## Known facts (from SportDex, verify before relying on them)
- Website: https://docs.sleeper.com
- Docs: https://docs.sleeper.com
- Sports: American football
- Data: Fantasy, Team stats
- Protocols: REST; formats: json
- Auth: none
- Free plan: Non-commercial, 1000 requests per minute
- Note: Docs say only NFL supported for league endpoints. Fantasy-league data rather than a game stats feed.

## Verify before writing code
- live update frequency
- exact endpoint paths, parameters and response fields (read the official docs, do not guess)

## Implementation rules
- Keep the API key on the server (environment variable, backend route or edge function); never ship it to the browser.
- Cache responses and respect rate limits; count how many requests each screen triggers.
- Handle errors explicitly: invalid key, quota exceeded (429), missing fields, empty fixtures, timeouts.
- Start with one demo request and log the raw response before building UI on assumed field names.

Data quality signals

Data source & company

Official partners
Not disclosed
How data is collected
Not disclosed
Certifications
Not disclosed
Payment methods
Not disclosed
Minimum contract
Not disclosed
Country
United States
Founded
Not disclosed

Reddit · Hacker News · Stack Overflow · GitHub · YouTube

What developers say

Mostly positivefree tiercoveragedocslegal

Free, read-only fantasy football API widely used by hobbyists for league websites, Google Sheets exports, power rankings, draft and waiver analysis, plus wrappers in Python and Ruby and MCP servers. Easy to start with and many repos build on it. Complaints: no player scoring or projections, hard to get bench totals, non-commercial licence.

Praised for

  • Free and no-auth read access to leagues, rosters and drafts
  • Large hobbyist ecosystem and client libraries
  • Good for aggregating league-wide data at scale

Complaints

  • Lacks NFL player stats and projections
  • Less flexible than other fantasy platforms for scoring data
  • Non-commercial use only without licence

Our summary of public discussions, not a rating. Vendor posts are not counted as user opinion.

Discussions

Shortlist next steps

Alternatives worth comparing

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    Yahoo's REST API exposing fantasy football, baseball, basketball and hockey data: leagues, teams, players, rosters, transactions and matchups. Requires OAuth 2.0 and an approved developer application.

    American footballBaseballBasketball+1
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  • Ball Ranks logo
    Ball RanksFantasy platform46

    Fantasy basketball and football rankings and player projections via a versioned REST API (OpenAPI 3.1) and a read-only MCP server; anonymous and free access, premium model for members.

    Free tierBasketballAmerican football
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  • Fantasy Nerds API logo
    Fantasy Nerds APIFantasy platform32

    Fantasy sports API with rankings, projections, injuries, depth charts and related data for football, baseball and basketball, accessed with a key from a free account.

    American footballBaseballBasketball
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  • FantasyPros API logo
    FantasyPros APIFantasy platform54

    REST API for fantasy rankings, projections, player news, injuries and lineups across NFL, MLB, NBA and NHL, with consensus data aggregated from many experts.

    Free tierAmerican footballBaseballBasketball+1
    from $8.99/mo9 discussions · 212 repos
  • SportsDataIO logo
    SportsDataIOSports data API60

    Commercial sports data provider offering scores, odds, projections, news, historical data, IDs and widgets for 75+ sports and 1,500+ competitions through developer APIs.

    LiveMulti-sport (40+)American footballBasketball+7
    Price not public44 discussions · 776 repos
Sleeper vs Yahoo Fantasy Sports APISleeper vs Ball RanksSleeper vs Fantasy Nerds APISleeper vs FantasyPros APISleeper vs SportsDataIO

Evidence & transparency

Official sources

Facts were extracted from the provider's own pages on 2026-11-03. Empty fields mean the provider does not say, not that the feature is missing. How we know