Data sources & methodology
Fantasy Signal combines recent production, opportunity, efficiency, role, matchup context and market value to generate its player signal. Every value, projection and grade is calculated by Fantasy Signal from the sources below; AI only explains those outputs.
| Provider | Data used | Purpose | How it's accessed | Terms status |
|---|---|---|---|---|
| nflverse | Weekly player stats, snap counts, usage, schedules, rosters, Next Gen Stats mirror | Core statistics behind every value and signal | Public CSV/Parquet files, imported server-side | Under review |
| Sleeper | Your league, rosters, records, transactions, live scores | League import and live matchups | Public read-only API, per user request | Under review |
| FantasyCalc | Crowd trade-market values | Market value vs Fantasy Signal value | Public API, cached 6 hours | Under review |
| ESPN (unofficial feed) | Live play-by-play and game state | Live game pages | Unofficial public endpoint | Under review |
| The Odds API | Bookmaker game and player lines | Betting Lines (admin only) | Paid/free API key | Under review |
| Open-Meteo | Kickoff weather forecasts | Game-condition signals | Public API | Under review |
| Lovable AI | Written explanations of Fantasy Signal outputs | Assistant and summaries | Server-side AI gateway | Confirmed |
Last reviewed 2026-09-27. "Under review" means commercial terms haven't been confirmed yet — it is not a claim of permission. League data is read only when you connect your own league.
Fantasy Signal is an independent fantasy football analytics platform and is not affiliated with, endorsed by, or sponsored by the NFL, its teams, or third-party fantasy platforms. All trademarks belong to their respective owners.