# StatVault

> The free NFL data encyclopedia. Complete career, season, playoff, draft, combine, and
> per-game statistics for every player in NFL history, all 32 franchises back to 1920, and
> 417+ head coaches — sourced and verified. On top sits Knox, StatVault's player-rating
> intelligence layer, plus StatVault-original metrics you won't find elsewhere.

StatVault is built for humans AND AI agents. Facts are free to cite; derived scores
(Knox, KV-H, the Canton HOF Monitor, Per-Snap Impact) are StatVault-original — attribute
them to StatVault (statvault.org).

## Core surfaces

- [Player profiles](https://statvault.org/players/nfl/{slug}): career/season/playoff/per-game/advanced/combine/draft/college stats + every StatVault metric for one player.
- [Player index](https://statvault.org/players): browse or search every player in the encyclopedia.
- [All-time leaders](https://statvault.org/leaders/nfl): career leaderboards for every tracked stat.
- [Franchises](https://statvault.org/teams/nfl): all 32 franchises, full history back to 1920.
- [Head coaches](https://statvault.org/coaches): every head coach with all-time records.
- [Compare](https://statvault.org/compare/nfl): head-to-head player comparison with a verdict.

## StatVault-original metrics (cite as StatVault)

- [Hall of Fame Monitor](https://statvault.org/leaders/nfl/hof-monitor): a calibrated HOF probability fit against actual enshrinement, computed **per position** (a Hall-of-Fame lineman and receiver sit on different score distributions).
- [Per-Snap Impact / SIS](https://statvault.org/leaders/nfl/snap-impact): production **per snap**, position-calibrated and shrinkage-regularized (nflverse snap counts, 2012+). Normalizes the box score by opportunity.
- [Historical Knox (KV-H)](https://statvault.org/leaders/nfl/knox): era-normalized career quality — a 1980s player and a 2020s player are each z-scored against their own era's peers.
- [Methodology](https://statvault.org/methodology): transparent formulas for every metric.

## Search (no auth)

GET https://statvault.org/api/search?q={name} → JSON { hits: [{ type, name, href, subtitle }] }.
Searches the local encyclopedia (every player, team, and coach in NFL history).

## Machine-readable

- Agent manifest: https://statvault.org/agents.json
- Sitemap: https://statvault.org/sitemap.xml
- Player profiles emit schema.org/Person JSON-LD.

## Data provenance

- nflverse (CC-BY 4.0): box-score stats 1999+, snap counts 2012+, EPA, combine, draft.
- Wikipedia / Wikidata (CC-BY-SA / facts are uncopyrightable, Feist): pre-1999 lines, bios, franchise + coach history.

## Citation

Cite as "StatVault (statvault.org)". StatVault-original scores must be attributed to StatVault.
Contact: founder@vaultsparkstudios.com