Data & sources
Last reviewed: September 9, 2026. Every external source Iron Tuna reads, what it feeds, the basis it is used on, and the attribution it carries.
Iron Tuna publishes numbers, so where the numbers come from is part of the product. This page is the public record of that. It is kept in step with the engineering inventory in the repository, and a source cannot be added to the application without being added here.
Content sources
| Source | Used for | Basis |
|---|---|---|
| nflverse-data | Player, roster and schedule data; the player identity map behind every board and player card; the headshot lookup. | Open data under CC BY 4.0. Commercial use permitted with attribution. Data is modified by Iron Tuna. |
| The Odds API | Game lines, totals and player markets, pulled on a schedule and cached. These are the input to every market-implied number on the site. | Paid API subscription. Lines are never republished raw: every figure shown is derived server-side and labelled as derived where it is. |
| ESPN public endpoints | Injury and availability status, scoreboard state, depth charts and game summaries. | Public endpoints, read server-side and cached. Transformed before display; no response body is passed through to the browser. Under review for replacement by nflverse equivalents. |
| Sleeper API | Player identity metadata, and — where you connect one — your own Sleeper league’s settings, rosters, matchups and transactions. | Read under Sleeper’s public API with attribution. The league connector runs only when you connect a league yourself. |
| Yahoo Fantasy API | Your own Yahoo league, if you connect one. | OAuth 2.0 under the Yahoo Developer Network terms, read-only scope, authorised by you on Yahoo’s own site. We never see your Yahoo password; the tokens Yahoo issues are encrypted at rest. |
| DFS salary files | DraftKings and FanDuel salaries for the current slate. | Imported from the contest-entry export the operator gives its own entrants, or from a licensed salary feed where one is configured. Iron Tuna does not read either operator’s API. |
| Team and player imagery | Headshots and team marks on story pages, player cards and the front page. | Referenced from the publishers’ own image CDNs rather than copied or stored by Iron Tuna. All rights in those images remain with their owners; Iron Tuna claims none and asserts no licence, endorsement or affiliation. See the notice below. |
Service providers
These carry the product rather than supply its data: Cloudflare (hosting, edge caching, bot challenge and email routing), Stripe (payments — card details go to Stripe directly and never reach Iron Tuna), Resend (transactional email), and Anthropic and OpenAI model APIs (the Value Coach, and the generated editorial and analyst content). Google Analytics and Google Ads tags run on public pages. What each of them receives is described in the Privacy Policy.
Attribution
nflverse-data
Player, roster, schedule and injury data from nflverse-data, licensed under CC BY 4.0. Modified by Iron Tuna. github.com/nflverse/nflverse-data
Sleeper
Player metadata from Sleeper. sleeper.com
Trademarks and affiliation
NFL, ESPN, Sleeper, Yahoo, DraftKings, FanDuel, Underdog and PrizePicks are the trademarks of their respective owners. Iron Tuna uses those names only to identify the platform, contest type or data source a number relates to. Iron Tuna is not affiliated with, endorsed by, sponsored by, or licensed by the National Football League, any NFL club, any fantasy platform, or any sportsbook, exchange or daily fantasy operator. Team and player images shown on this site are served from their publishers’ own image hosts and remain the property of their owners. If you own rights in material shown here and want it removed, write to support@irontuna.com and we will take it down.
What Iron Tuna does not do
Iron Tuna does not accept wagers, hold funds, or settle any contract or position, and it does not operate a sportsbook, an exchange, a daily fantasy contest or a prediction market. Odds and salaries shown are informational, are derived from the sources above, and may differ from what a venue is quoting when you look. See the Terms of Service for the full statement.