The sports market tape nobody else keeps
ScoreTape is an independent research project. We record what sports prediction markets actually trade on — order-book depth, line movement, the injury report as it stood before tip-off — and join it to what actually happened.
Why we built it
Sports data is sold in silos: odds feeds without markets, score archives without depth, injury reports you have to poll yourself. A prediction-market strategy trades against all of them at once. The expensive part isn't collecting any single feed — it's the join: knowing that this Polymarket moneyline, that DraftKings line, this final score, and that injury report all belong to the same game.
ScoreTape maintains that join as a first-class, verified artifact. Every prediction market is entity-resolved to its real-world game, and the mapping is continuously cross-checked: settled market winners agree with the real result in 99.96% of checked moneylines. The parts that can't be backfilled — depth, line movement, injury timelines — are forward-captured continuously, so the archive only gets more valuable.
How we work
The stack is deliberately small and durable: lightweight collectors, ClickHouse for the hot window, a compact columnar cold archive, and a Rust API. We document what we capture, at what cadence, and how the entity resolution is verified — and we are precise about coverage per league rather than rounding it up in marketing copy.
Not affiliated
ScoreTape is independent and is not affiliated with, endorsed by, or sponsored by Polymarket, Kalshi, ESPN, or any exchange, league, or team. All product names are the property of their respective owners.
Questions or data requests? Get in touch.