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 FinalEDM0.547FLA0.458MLBNYY0.582LAD0.421WNBANYL0.634LVA0.370MLBCHC0.498ATL0.505NFL prediction-market data, welded to the game.
DepthFeed 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. 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 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. 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/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. 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 NFL coverage
The NFL runs DepthFeed's deepest stack — order-book depth, settlement, scores, multi-book sportsbook lines, play-by-play, win probability, player props, the live injury wire, and an odds archive back to 1999.
Sportsbook odds
Multi-book · 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 DepthFeed
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 DepthFeed welds the prediction-market depth, the sportsbook odds, the result, and the injury report into one verified NFL game 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 | |||
| Historical odds archive (back to 1999 / 2000-01) | |||
| 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 NFL prediction-market data, DepthFeed is the only API that joins Polymarket and Kalshi order-book depth to final scores, multi-book 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. DepthFeed is independent and not affiliated with any exchange, sportsbook, or league.
Quickstart
From key to live NFL 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 NFL 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.
nfl.sh
# Browse live NFL markets
$ curl -s -H "Authorization: Bearer $KEY" \
"https://api.depthfeed.com/v3/sports/markets?league=nfl&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 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. DepthFeed'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. DepthFeed records the live NFL order book — both sides, every level, continuously — 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. DepthFeed 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
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 NFL market — moneylines, spreads, totals, and player props — recorded continuously with full order-book depth and settlement, then entity-resolved to the ESPN game: final score, multi-book 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, full ladders, sportsbook odds, scores, and injuries — one DepthFeed account, with a seven-day Desk evaluation available for production benchmarking.