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 FinalEDM0.547FLA0.458MLBNYY0.582LAD0.421WNBANYL0.634LVA0.370MLBCHC0.498ATL0.505College Basketball prediction-market data, tip-off to the bracket.
DepthFeed records the full order book of every Polymarket and Kalshi college-basketball market — moneylines, spreads, and totals — then joins each one to the final score and the sportsbook lines. Built for the March volume nobody else keeps. 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
Multi-book
sportsbook odds
moneylines, spreads, and totals beside the prediction-market book
March
volume on tape
the tournament board recorded continuously
The product
One College Basketball game, one document
Every feed knows the same College Basketball 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.
GET /v1/games/cbb-duke-unc-2026-03-07200 · matched
{
"result": { "winner": "Duke", "score": "78–74" },
"odds": [ { "provider": "FanDuel",
"spread": -2.5, "total": 149.5 }, … ],
"markets": [ { "kind": "moneyline",
"winner": "Duke" }, … 24 ],
"settlement": { "verified": true, "agrees_with_espn": true }
}
Entity-resolved and settlement-verified — markets, books, and result on one CBB 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
Coverage
College-basketball coverage
College basketball carries order-book depth, settlement, scores, and sportsbook odds across the regular season and the tournament — built for March volume.
Sportsbook odds
Up to 15 books · spread · total · moneyline
Tournament
The March board recorded continuously
Results
Final scores, settlement-verified
Play-by-play
Where ESPN carries it
Settlement
99.96% agreement with the final score
Why DepthFeed
The best source of College Basketball prediction-market data
Sports odds APIs sell you college-basketball spreads. Exchange APIs hand you a raw Polymarket book with no game attached. Only DepthFeed welds the prediction-market depth, the sportsbook odds, and the verified result into one CBB record — at the volume the tournament demands.
| 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. | |||
| 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 college-basketball prediction-market data, DepthFeed is the only API that joins Polymarket and Kalshi order-book depth to final scores and sportsbook odds at March-Madness volume — 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 College Basketball 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 College Basketball 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.
cbb.sh
# Browse live College Basketball markets
$ curl -s -H "Authorization: Bearer $KEY" \
"https://api.depthfeed.com/v3/sports/markets?league=cbb&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 college-basketball prediction markets
College basketball is a volume game — hundreds of teams, a board that explodes in March, and spreads that move on a tempo mismatch. CBB prediction-market data is only useful joined to the game that settled it.
01
The join is the edge
Polymarket names a market with a slug; ESPN files the same game under an event id. DepthFeed welds the two and verifies it against settlement (99.96% agreement across sports). One request returns the market, the books, and the result as one document — even across the chaos of the tournament.
02
Depth through the bracket
March turns the board over by the hour. DepthFeed records the live CBB order book on Polymarket and Kalshi, both sides, every level, so a backtest fills against real liquidity, game after game. Depth is forward-captured and cannot be backfilled — the tournament tape only exists because someone recorded it live.
03
Settlement you can trust
With this many games, automated settlement has to be right. DepthFeed cross-checks every resolved market winner against the ESPN result — 99.96% agreement — so your backtest reconciles against the game that actually happened, not a label.
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 college-basketball market — moneylines, spreads, and totals — recorded with full order-book depth and settlement, joined to the ESPN game: final score, sportsbook odds, and play-by-play where available.
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.