Underdog Fantasy

aid: underdog-fantasy
name: Underdog Fantasy
description: Underdog (Underdog Sports, formerly Underdog Fantasy) is a Brooklyn, New York based sports gaming company founded
  in 2020 by Jeremy Levine that operates daily fantasy sports, pick'em, and — since 2025 — federally regulated sports prediction
  markets on its own proprietary technology stack. Its consumer products include Classic Pick'em, Pick'em Champions, Best
  Ball and other Draft Games, Streaks, Team Picks, and the Underdog Predict prediction-markets exchange, delivered through
  iOS, Android, and web apps rather than a public developer API. Underdog reached roughly $500M in annual revenue within five
  years, was valued at $1.2B after a Spark Capital-led Series C in March 2025, acquired CFTC-registered derivatives infrastructure
  in March 2026, and in July 2026 was the subject of a proposed acquisition by IG Group. The company publishes no developer
  portal, API documentation, or machine-readable API contract; its public technical surface is limited to an RFC 9116 security.txt
  with a PGP key, a Honeybadger-hosted status page covering its API and Stats services, and the Underdog-Inc GitHub organization.
image: https://cdn.prod.website-files.com/67d86be30d981ef8b914a00d/67d86be30d981ef8b914a10f_big-fav.png
url: https://raw.githubusercontent.com/api-evangelist/underdog-fantasy/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment-pass
specificationVersion: '0.20'
created: '2026-08-02'
modified: '2026-08-02'
tags:
- Company
- Sports
- Fantasy Sports
- Sports Betting
- Prediction Markets
- Gaming
- Entertainment
- Consumer
- Mobile
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.underdogsports.com/
- type: Website
  url: https://forgeglobal.com/underdog-fantasy_stock/
- type: SignUp
  url: https://app.underdogsports.com/register
- type: Login
  url: https://app.underdogsports.com/login
- type: Support
  url: https://help.underdogsports.com/en/
- type: TermsOfService
  url: https://legal.underdogsports.com/#terms-of-use
- type: PrivacyPolicy
  url: https://legal.underdogsports.com/#template-altl3g4-b
- type: StatusPage
  url: https://status.underdogfantasy.com/
- type: GitHubOrganization
  url: https://github.com/Underdog-Inc
- type: Security
  url: https://underdogfantasy.com/.well-known/security.txt
- type: SecurityTxt
  url: well-known/underdog-fantasy-security.txt
- type: WellKnown
  url: well-known/underdog-fantasy-well-known.yml
- type: VulnerabilityDisclosure
  url: security/underdog-fantasy-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/underdog-fantasy-domain-security.yml
- type: Lifecycle
  url: lifecycle/underdog-fantasy-lifecycle.yml
- type: Packages
  url: packages/underdog-fantasy-packages.yml
- type: LLMsTxt
  url: llms/underdog-fantasy-llms.txt
- type: Careers
  url: https://www.underdogsports.com/careers
- type: Press
  url: https://www.underdogsports.com/news
- type: Rules
  url: https://app.underdogsports.com/rules
- type: ResponsibleGaming
  url: https://www.underdogsports.com/responsible-gaming-resources
- type: iOSApp
  url: https://apps.apple.com/us/app/underdog-fantasy-sports/id1514665962
- type: AndroidApp
  url: https://play.google.com/store/apps/details?id=com.underdogsports.fantasy
x-enrichment:
  date: '2026-08-02'
  status: enriched
  artifacts_added: 8
  pass: local-v1