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 MLB market, pitch to settlement.
ScoreTape records the full order book of every Polymarket and Kalshi MLB market — moneylines, run lines, totals, and player props — then joins each one to the final score, the sportsbook lines, the box score, and the injury report as it stood before first pitch. 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 LigaCFBCFBCBBCBBATPTennis2
venues on tape
every Polymarket & Kalshi market, both sides of the book
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
15
sportsbooks joined
up to 15 books per game, beside the prediction-market book
The product
One MLB game, one document
Every feed knows the same MLB 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/mlb-lad-nyy-2026-06-09200 · matched
{
"result": { "winner": "Yankees", "score": "5–3" },
"odds": [ { "provider": "FanDuel",
"run_line": -1.5, "ml": -142 }, … ],
"markets": [ { "kind": "moneyline",
"winner": "Yankees" }, … 41 ],
"injuries": [ { "before_first_pitch": "1h 10m",
"change": "day-to-day → 15-day IL" }, … ]
}
Entity-resolved and settlement-verified — markets, books, line score, box, and the IL on one MLB 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 MLB coverage
MLB runs ScoreTape's deepest stack — order-book depth, settlement, scores and line scores, sportsbook odds, box scores, play-by-play, player props resolved to athletes, and the live injury wire across all 30 clubs.
Sportsbook odds
Up to 15 books · run line · total · moneyline
Player props
Strikeouts · home runs · hits → ESPN athletes
Box scores
Per-athlete lines on every matched game
Play-by-play
Plays + win probability
Injuries
60s sweep · signed webhooks · IL change-log
Why ScoreTape
The best source of MLB prediction-market data
Sports odds APIs sell you MLB run 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, the box score, and the injury report into one verified MLB 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 MLB prediction-market data, ScoreTape is the only API that joins Polymarket and Kalshi depth to final scores, sportsbook run lines, box scores, player props resolved to athletes, and a real-time IL/injury feed — with the 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 MLB data in minutes
Every MLB 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 MLB 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.
mlb.sh
# One MLB game, one document
$ GAME="mlb-lad-nyy-2026-06-09"
$ 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/mlb/games?matched=true"Clean JSON·Cursor pagination·Per-plan rate limits
Why joined data
What it takes to model the MLB prediction markets
A baseball market turns on the pitching matchup, the day-to-day report, and the run line — across a 162-game grind where edges are thin and volume is everything. MLB prediction-market data is only useful joined to the game, the box, and the injury report behind it.
01
The join is the edge
Polymarket names a Yankees moneyline with a slug; ESPN files the same game under an event id. ScoreTape welds the two and keeps proving it by checking every settled MLB market's winner against the real final score, with 99.96% agreement across all sports. One request returns the market, the books, the line score, and the injury report as one document.
02
Depth across the grind
162 games a season means thin edges found at scale. ScoreTape records the live MLB order book on Polymarket and Kalshi — both sides, every level — so a backtest fills against real liquidity, game after game, not a mid-price. Depth and run-line movement are forward-captured and cannot be backfilled.
03
The injury report, day to day
Baseball's report shifts daily — a scratched starter, a reliever to the IL. ScoreTape sweeps it every 60 seconds and fires a signed webhook on every status change, filterable by team and status. The change-log is archived forward so you can replay exactly who was available at first pitch.
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 MLB market — moneylines, run lines, totals, and player props — recorded with full order-book depth and settlement, joined to the ESPN game: final score and line score, sportsbook odds, box scores, play-by-play, and the pre-game injury report. Player props (strikeouts, home runs, hits, total bases) 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.