Data & sources
Last reviewed: September 10, 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. |
| SportsGameOdds | Game spreads and totals, and the player markets behind every prop-based projection. This is one of the market feeds under The Line, the previews and the weekly boards. | Paid API subscription. Lines are never republished raw: every figure shown is derived server-side, and no page attributes a number to a named sportsbook. |
| PropLine | Betting Market Intel current NFL game lines and player props, plus opening/current movement and cross-book steam when the configured plan provides history. | Used under PropLine terms permitting user-facing apps and websites to surface derived insights and individual values. Iron Tuna shows derived consensus and movement, not a bulk raw odds feed. The default integration excludes prediction exchanges. |
| The Odds API | Player markets, as an alternate feed where it is the one configured. | Paid API subscription. Same handling: derived server-side, never republished raw. |
| 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, authorized by you on Yahoo’s own site. We never see your Yahoo password; the tokens Yahoo issues are encrypted at rest. |
| CBS Sportsline | Your own CBS football league, if the connector is enabled and you connect one. | Read-only league access using the token you provide. The token is encrypted separately for each league and deleted when that league is disconnected. The connector remains off until CBS access and commercial terms are verified. |
| DFS salaries | DraftKings and FanDuel salaries used by the DFS tools. | DraftKings weekly Classic salaries are retrieved by an owner-directed scheduled repository workflow from undocumented, keyless DraftKings lobby and draftables endpoints, then validated and imported into Iron Tuna. FanDuel salaries come from an entrant-provided contest export or a licensed salary feed where configured. DraftKings automated access may conflict with operator terms and can change without notice. |
| 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 license, endorsement or affiliation. See the notice below. |
| Wikimedia Commons | Game photographs on story pages and the front page. | Openly licensed files only (public domain, CC0, CC BY or CC BY-SA). Each photograph is shown with its photographer, its license and a link to both, as those licenses require, and is cropped to fit the page. The photographs are referenced from Wikimedia’s servers, not copied. |
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, CBS Sportsline, 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.