Behind the scenes
Summary + sample · full document is 1,288 words
A quick-reference table of every data source, what it covers, and how accessible it is. Companion to the full narrative in "Where our data comes from".
Costs are approximate and as of mid-2026; treat as orders of magnitude. Access difficulty is a 1–5 score: 1 = "git clone, you're done"; 5 = "vendor partnership required."
| Source | What it covers | Cost | Access difficulty | Notes |
|---|---|---|---|---|
| Football-Data.co.uk | Top European leagues 1993–present, results | Free | 1 | The starter dataset; CSV per league per season. |
| FBref (Sports Reference) | Per-match per-player aggregates from Opta/StatsPerform, broad historical | Free (rate-limited scrape) | 2 | Aggregates only, not raw events. |
| Wikipedia / Wikidata | International tournaments, historical seasons | Free | 1 | Structured back-fill source for pre-2000 data and national-team results. |
| ClubElo | Per-club Elo time-series, free CSVs | Free | 1 | Useful team-strength prior. |
Pro Pass
Data sources at a glance runs 1,288 words. The Pass unlocks this document and every research note in full, plus per-fixture probabilities, the four-model comparison, and per-fixture tactical analysis.
Every forecast graded against the real result, scored on 987 matches since 2014. See the scorecard.
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