Markets & depth
Polymarket + Kalshi order books, both sides
Live
NBA Finals
NYK0.612
SAS0.391NHL Cup Final
EDM0.547
FLA0.458MLB
NYY0.582
LAD0.421WNBA
NYL0.634
LVA0.370MLB
CHC0.498
ATL0.505
NYK0.612SAS0.391NHL Cup FinalEDM0.547FLA0.458MLBNYY0.582LAD0.421WNBANYL0.634LVA0.370MLBCHC0.498ATL0.505Every NFL market, welded to the game.
ScoreTape records the full order book of every Polymarket and Kalshi NFL market — moneylines, spreads, totals, and player props — then joins each one to the final score, the sportsbook lines, the play-by-play, and the injury report as it stood before kickoff. Served over one REST API.
Free tier, no card — every league and endpoint included.
ScoreTape
Jun 12 · liveNBAMLBNHLWNBAEPL
MoneylineSpreadTotalProps
Settlement-verifiedTimeTeamPolymarketKalshiDKFDBest
20:30Knicks0.612▲0.609-135-1380.612
Knicks0.612▲0.609-135-1380.612Spurs0.391▼0.394+115+1180.39420:00Oilers0.5470.551-120-1180.551
Oilers0.5470.551-120-1180.551Panthers0.458▲0.452+102+1000.45819:05Yankees0.582▲0.578-142-1400.582
Yankees0.582▲0.578-142-1400.582Dodgers0.4210.426+120+1220.42619:00Liberty0.6340.630-170-1720.634
Liberty0.6340.630-170-1720.634Aces0.370▼0.374+145+1480.374369,412 markets on tapeorder books streaming
369,000 markets across 13 leagues — every one resolved to its real-world game
NFL
NBA
MLB
NHL
WNBA
UFC
Premier League
Champions League
La LigaCFBCFBCBBCBBATPTennis1999
odds archive
closing lines & results back to 1999 (nflverse)
99.96%
verified settlements
settled market winners checked against the real final score
~60s
injury detection
every status change pushed to your webhook, HMAC-signed
Play
by-play + win prob
every matched game, joined to the markets
The product
One NFL game, one document
Every feed knows the same NFL game by a different name — a slug on Polymarket, an event id at ESPN, a ticker on the exchange. ScoreTape resolves them to one record and answers a single request with everything that game was.
PolymarketOrder-book depth — every level, both sides, tick by tick.
KalshiYes/no books and settlement for every sports market.
ESPN
Final scores, box scores, play-by-play — plus odds from up to 15 sportsbooks.
Injury wire
League-wide injury reports, swept every 60 seconds.
GET /v1/games/nfl-kc-buf-2026-01-18200 · matched
{
"result": { "winner": "Chiefs", "score": "27–24" },
"odds": [ { "provider": "DraftKings",
"spread": -2.5, "total": 48.5 }, … ],
"markets": [ { "kind": "spread",
"winner": "Chiefs -2.5" }, … 94 ],
"injuries": [ { "before_kickoff": "2h 40m",
"change": "questionable → out" }, … ]
}
Entity-resolved and settlement-verified — markets, books, score, plays, and injuries on one NFL game.
Market depth
Backtest against the book, not the headline price
A fill has a cost the last trade never shows. ScoreTape records the live order book for sports markets on Polymarket and Kalshi, so your strategy sizes against the liquidity that actually existed at that moment.
- Every level, both sides — not a last price or a mid nobody could trade
- Forward-captured continuously; order-book history cannot be backfilled
- Replayable: snapshot time-series per outcome token via one endpoint
Knicks
SpursBest bid
0.612
Mid
0.6135
Best ask
0.615
Spread
0.003
Cumulative depthBidsAsks
Imbalance
54 / 46
Injury wireLive
19:42:08
M. Carter · PGQuestionable → Out
M. Carter · PGQuestionable → Out19:41:12
D. Alvarez · WRLimited → Questionable
D. Alvarez · WRLimited → Questionable19:38:55
T. Okafor · SPDay-to-day → 15-day IL
T. Okafor · SPDay-to-day → 15-day IL19:36:31
R. Lindqvist · GProbable → Confirmed
R. Lindqvist · GProbable → Confirmed19:33:04
A. Reyes · FOut → Available
A. Reyes · FOut → AvailablePOST → your webhook · signed sha256=…
Injury webhooks
The line moves on the wire
Every big pre-game move starts in the injury report. ScoreTape watches the report for you — across NFL, NBA, MLB, NHL, WNBA, and the college leagues — and fires a signed webhook the moment a status flips.
- Pushed within seconds of detection — league-wide sweeps every 60 seconds
- HMAC-signed payloads, with league and status filters per subscription
- The full change-log is archived — replay any report, or any single player's history
Coverage
Full-stack NFL coverage
The NFL runs ScoreTape's deepest stack — order-book depth, settlement, scores, up to 15 sportsbook lines, play-by-play, win probability, player props, the live injury wire, and an odds archive back to 1999.
Sportsbook odds
Up to 15 books · spread · total · moneyline
Historical odds
Results & closing lines back to 1999 (nflverse)
Play-by-play
Plays + per-play win probability
Player props
Pass / rush / receiving yards · anytime TD
Injuries
60s sweep · signed webhooks · full change-log
Why ScoreTape
The best source of NFL prediction-market data
Sports odds APIs sell you NFL lines. Exchange APIs hand you a raw Polymarket book with no game attached. Only ScoreTape welds the prediction-market depth, the sportsbook odds, the result, and the injury report into one verified NFL game record.
| Capability | ScoreTapethis API | Sports odds APIsthe-odds-api, SportsDataIO | Exchange APIsPolymarket / Kalshi direct |
|---|---|---|---|
| Prediction-market order-book depth (both sides, every level)Exchange APIs expose a raw book, but unjoined and not archived as forward-captured history. | |||
| Sportsbook odds in the same recordOdds APIs serve lines only — no prediction-market book beside them. | |||
| Final scores & results joined to the market | |||
| Settlement-verified market-to-game join (99.96%)No other source cross-checks settled market winners against the real result. | |||
| Real-time injury webhooks (~60s, signed) | |||
| Player props resolved to real athletes | |||
| Historical odds archive (back to 1999 / 2000-01) | |||
| One request returns the whole gameMarkets, odds, result, and injuries arrive as a single joined document. |
The bottom line. For NFL prediction-market data, ScoreTape is the only API that joins Polymarket and Kalshi order-book depth to final scores, up to 15 sportsbook lines, play-by-play, player props, and a real-time injury feed — with the market-to-game join verified at 99.96%.
✓ full · – partial · ✕ not offered. Comparison reflects the standard data products of each category; individual vendors vary. ScoreTape is independent and not affiliated with any exchange, sportsbook, or league.
Quickstart
From key to joined NFL data in minutes
Every NFL endpoint is open on the free tier — pull a game, then point a webhook at the injury wire.
- 01
Grab a key
Free tier, no card — every league and endpoint is open from day one.
- 02
Pull a NFL game
One request returns the joined document: markets, odds, result, injuries.
- 03
Point a webhook
Injury alerts arrive signed, filtered to the teams and statuses you trade.
nfl.sh
# One NFL game, one document
$ GAME="nfl-kc-buf-2026-01-18"
$ curl -s -H "X-API-Key: $KEY" \
"https://api.scoretape.com/v1/games/$GAME"
# Browse this sport's markets
$ curl -s -H "X-API-Key: $KEY" \
"https://api.scoretape.com/v1/nfl/games?matched=true"Clean JSON·Cursor pagination·Per-plan rate limits
Why joined data
What it takes to model the NFL prediction markets
An NFL strategy on Polymarket or Kalshi trades against the spread, the total, the injury report, and the closing line at once — but those arrive from four different feeds under four different names. NFL prediction-market data is only useful joined to the game it settled on.
01
The join is the edge
Polymarket names a Chiefs moneyline with a slug; ESPN files the same game under an event id; nflverse keys it by its own game id. ScoreTape's entity-resolution layer welds all three — and keeps proving the weld by checking every settled NFL market's winner against the real final score, with 99.96% agreement. One request returns the market, the multi-sportsbook line, the result, the play-by-play, and the injury report as one document.
02
Depth, not the last price
A fill on a Sunday-morning Polymarket spread has a cost the last trade never shows. ScoreTape records the live NFL order book — both sides, every level, tick by tick — so a backtest sizes against the liquidity that actually existed, not a mid nobody could trade. NFL depth and line movement are forward-captured: they cannot be backfilled once the game is over.
03
Injuries move the line first
An NFL number moves the moment a starter is downgraded. ScoreTape sweeps the league-wide injury report every 60 seconds and fires a signed webhook the instant a status flips — Questionable to Out — filterable by team and status. The change-log is archived forward, so you can replay the report exactly as it stood at any minute before kickoff, then test that against how the market and the closing line moved.
Pricing
Pick your window
Every plan gets every league and every endpoint. You're choosing how far back the tape rolls — and how hard you can pull on it.
Free
$0free, no card
Seven days of tape to prove it's real.
- 7-day Kalshi & Polymarket tape
- 7-day scores & sportsbook odds
- All leagues, all endpoints
- Read-only API, 1 req/sec
Pro
Most popular$29per month
The modeler's window — a month of tape.
- 30-day Kalshi & Polymarket tape
- 90 days of scores & sportsbook odds
- Real-time injury webhooks (~60s)
- 25 req/sec, 1,000 req/min
- Settlement-verified winners
Scale
$79per month
Two months of tape, a full year of results.
- Everything in Pro
- 60-day Kalshi & Polymarket tape
- Full year of scores & sportsbook odds
- Live order-book snapshots
- 50 req/sec, 3,000 req/min
Enterprise
$200per month
Dedicated lanes for systematic desks.
- Everything in Scale
- Unlimited tape history
- Full sports archive — odds to 1999
- Dedicated capacity, 100 req/sec
- Priority support
Prediction-market data for every sport
Read the API docsFAQ
Common questions
The short version of what people ask before they pull their first game document.
Every Polymarket and Kalshi NFL market — moneylines, spreads, totals, and player props — recorded tick by tick with full order-book depth and settlement, then entity-resolved to the ESPN game: final score, up to 15 sportsbook lines, play-by-play, win probability, and the pre-kickoff injury report. Player props (passing yards, rushing yards, receiving yards, anytime touchdowns) are linked to real ESPN athletes.
Something else? Read the docs or ask us directly.
Stop joining sports data by hand
Markets, odds, results, and injuries — already resolved to the same game. The free tier opens every league and endpoint, no card.