# Underdog (Underdog Sports / Underdog Fantasy)

> Underdog is a Brooklyn, New York based sports gaming company founded in 2020 by Jeremy Levine. It operates daily fantasy sports, pick'em contests, and — since 2025 — federally regulated sports prediction markets, all on its own proprietary technology stack. Underdog does not publish a public developer API, developer portal, or machine-readable API contract; consumers reach the platform through its iOS, Android, and web applications.

This file was generated by the API Evangelist enrichment pipeline from the company's
public surface on 2026-08-02. Underdog publishes no llms.txt of its own
(https://underdogfantasy.com/llms.txt and https://www.underdogsports.com/llms.txt both
return HTTP 404).

## API status

- No public API: Underdog publishes no developer portal, no API documentation, no OpenAPI/Swagger, no GraphQL endpoint, no MCP server, and no A2A agent card. Every contract-discovery probe against underdogfantasy.com, underdogsports.com, api.underdogfantasy.com, stats.underdogfantasy.com, app.underdogsports.com and underdogpredict.com returned HTTP 404 or 403 on 2026-08-02.
- api.underdogfantasy.com is the non-public backend for the mobile and web applications. It is not documented, not versioned publicly, and carries no published terms of use for programmatic access.
- Third-party odds and player-prop feeds that advertise "Underdog APIs" are scrapers or aggregators operated by other companies, not first-party Underdog products.
- Note on name collision: docs.underdogprotocol.com and underdog.readme.io belong to Underdog Protocol, an unrelated Solana NFT infrastructure company.

## Products

- [Classic Pick'em](https://www.underdogsports.com/games/pickem): build a 2-to-5 pick entry on player statistical projections.
- [Pick'em Champions](https://www.underdogsports.com/games/pickem-champions): tournament-style pick'em format.
- [Draft Games](https://www.underdogsports.com/games/drafts): best-ball and season-long fantasy drafts.
- [Streaks](https://www.underdogsports.com/games/streaks): consecutive-pick contest format.
- [Team Picks](https://www.underdogsports.com/games/team-picks): team-outcome based picks.
- [Underdog Predict](https://underdogpredict.com/): CFTC-regulated sports prediction markets exchange.
- [Rules & Scoring](https://app.underdogsports.com/rules): the authoritative contest rules.
- [Average Results](https://www.underdogsports.com/average-results): published average customer outcomes.

## Company

- [Website](https://www.underdogsports.com/)
- [Media & Press](https://www.underdogsports.com/news)
- [Careers](https://www.underdogsports.com/careers)
- [GitHub organization](https://github.com/Underdog-Inc)
- [Help center](https://help.underdogsports.com/en/)
- [Status page](https://status.underdogfantasy.com/) — Honeybadger-hosted; monitors an "API" and a "Stats" component.
- [Responsible gaming resources](https://www.underdogsports.com/responsible-gaming-resources)
- [GuardDog Fund](https://www.underdogsports.com/guarddog)

## Legal

- [Fantasy Terms of Use](https://legal.underdogsports.com/#terms-of-use)
- [Underdog Global Privacy Policy](https://legal.underdogsports.com/#template-altl3g4-b)
- [Sports Betting Terms of Use](https://legal.underdogsports.com/#template-xqaceptu9)
- [Sports Betting House Rules](https://legal.underdogsports.com/#template-cbdklng4w)
- [GLBA Privacy Notice](https://legal.underdogsports.com/#template-bq6kyay3)

## Security

- [security.txt](https://underdogfantasy.com/.well-known/security.txt) — RFC 9116; Contact: security@underdogsports.com; expires 2027-04-13.
- [PGP public key](https://underdogfantasy.com/.well-known/udsecurity.asc)
- No public bug bounty program was verified.

## Apps

- [iOS](https://apps.apple.com/us/app/underdog-fantasy-sports/id1514665962)
- [Android](https://play.google.com/store/apps/details?id=com.underdogsports.fantasy)

## API Evangelist artifacts

- [apis.yml](https://raw.githubusercontent.com/api-evangelist/underdog-fantasy/refs/heads/main/apis.yml)
- well-known/underdog-fantasy-well-known.yml — the /.well-known/ probe index
- security/underdog-fantasy-domain-security.yml — TLS/HSTS/DNSSEC/CAA/SPF/DMARC posture
- security/underdog-fantasy-vulnerability-disclosure.yml — security.txt derived disclosure profile
- lifecycle/underdog-fantasy-lifecycle.yml — status page and policy versioning
- packages/underdog-fantasy-packages.yml — registry and GitHub organization survey