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 FinalEDM0.547FLA0.458MLBNYY0.582LAD0.421WNBANYL0.634LVA0.370MLBCHC0.498ATL0.505MLB prediction-market data, pitch to settlement.
DepthFeed 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. Available through DepthFeed's REST API and live WebSocket.
Desk includes sports REST + WebSocket · 7-day evaluation available.
DepthFeed
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
Multi-book
sportsbook odds
moneylines, spreads, and totals 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. DepthFeed resolves them to one record and answers a single request with everything that game was.
PolymarketOrder-book depth — every level on both sides, captured as complete ladders.
KalshiYes/no books and settlement for every sports market.
ESPN
Final scores, box scores, play-by-play — plus multi-book moneyline, spread, and total odds.
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. DepthFeed 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. DepthFeed 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 DepthFeed'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 DepthFeed
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 DepthFeed welds the prediction-market depth, the sportsbook odds, the result, the box score, and the injury report into one verified MLB record.
| Capability | DepthFeedthis 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 live book — DepthFeed records every level on both sides as complete ladders. | |||
| Forward-captured as a queryable history, not just liveDepth cannot be backfilled once the game is over — the archive only exists because it was recorded live. | |||
| 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 | |||
| One request returns the whole game as one documentMarkets, depth, settlement — and odds, result and injuries where the sport carries them — in a single record. |
The bottom line. For MLB prediction-market data, DepthFeed 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. DepthFeed is independent and not affiliated with any exchange, sportsbook, or league.
Quickstart
From key to live MLB depth in minutes
Sports REST is included on every DepthFeed tier; Quant, Desk Lite, and Desk add one, two, and three live sports books.
- 01
Get a Desk key
Use a paid key or request a seven-day production evaluation.
- 02
Browse MLB markets
Filter the live catalog, then choose the outcome asset you want to follow.
- 03
Pull or stream depth
Fetch the latest complete ladder over REST, or subscribe to the same book over WebSocket.
mlb.sh
# Browse live MLB markets
$ curl -s -H "Authorization: Bearer $KEY" \
"https://api.depthfeed.com/v3/sports/markets?league=mlb&limit=25"
# Pull the latest full book for an outcome asset
$ curl -s -H "Authorization: Bearer $KEY" \
"https://api.depthfeed.com/v3/sports/books/<asset_id>/latest"Complete ladders·REST + WebSocket·Desk access
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. DepthFeed 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. DepthFeed 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. DepthFeed 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
Choose capacity, not venues
One account and one API for the complete DepthFeed lineup. Polymarket and Kalshi sports coverage ships together; tiers change history, throughput, and live-book concurrency.
Explorer
$0free, no card
A limited sample of the complete DepthFeed API.
Start free- 7-day unified history
- Sports REST: Polymarket + Kalshi
- Read-only API, 1 req/sec
- Sub-second event-driven snapshots
- BTC markets (latest, capped)
- Live WebSocket stream: 1 BTC subscription
- Backtest Lab + 1 paper-trading strategy
Quant
Most popular$29per month
Every venue, with room to build.
Get Quant- 30-day unified history, all assets
- Every supported venue — no add-ons
- Sports REST + injury webhooks + 1 live sports book
- Full bid/ask book depth
- Any interval: 1m, 5m, 1h… or raw ticks
- API 25 req/sec, 1,000 req/min
- Underlying price stamped per snapshot
- Live WebSocket stream: 5 subscriptions, 1 connection, every venue
- Backtest Lab + 5 paper-trading strategies (webhook signals)
Desk Lite
$79per month
3× the history, 2× the throughput of Quant.
Get Desk Lite- 90-day unified history (3× Quant)
- API 50 req/sec, 3,000 req/min
- Everything in Quant
- Every supported venue — no add-ons
- Sports REST + 2 live sports books
- Live WebSocket: 25 subscriptions, 2 connections
- 15 paper-trading strategies
Desk
Full archive$200per month
Dedicated capacity for systematic desks.
Get Desk- Full historical archive — our deepest window
- Sports full archive across every supported league
- Dedicated capacity, 100 req/sec
- 6,000 req/min sustained
- Everything in Desk Lite
- Priority backfill requests
- Live WebSocket: 100 subscriptions, 5 connections, wildcards + 3 sports books
- 7-day production-latency evaluation available on request
- 40 paper-trading strategies
FAQ
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, full ladders, sportsbook odds, scores, and injuries — one DepthFeed account, with a seven-day Desk evaluation available for production benchmarking.