Scanning 47 bookmakers + 3 prediction markets in real-time

We tell you when prediction markets and sportsbooks disagree

The first premium alert service combining prediction market data with traditional sportsbook odds to detect value bets, cross-platform arbs, and line movement signals.

Start Free Trial See Signal Types
47+
Sportsbooks tracked
3
Prediction markets
150+
Matched markets
30s
Scan interval
How it works

Three data sources. One edge.

We cross-reference prediction market prices, sharp bookmaker lines, and soft bookmaker odds to find the gaps others miss.

01
📊
Ingest Everything
Real-time WebSocket feeds from Kalshi, Polymarket, and Predict. Polling from 47+ sportsbooks via The Odds API. Every price, every market, every second.
02
🔍
Match & Compare
Our matching engine links the same event across platforms. Arsenal to win on Kalshi, Polymarket, Pinnacle, DraftKings, Bet365 — all unified into one view.
03
⚡
Detect & Alert
When prices diverge beyond our thresholds, you get an instant alert with the exact gap, direction, and recommended action. Telegram, email, or API webhook.
Signal Types

Four ways to find value

Each signal type exploits a different market inefficiency. Some are unique to OddSlice — nobody else combines PM + sportsbook data.

📈
PM vs Sportsbook Value
Unique
Compare prediction market consensus (Kalshi + Polymarket average) against sportsbook implied probabilities. When they disagree by 3%+, there's value.
Example signal
EventArsenal vs Bournemouth
PM Consensus71.2%
Sportsbook Best67.8%
Gap+3.4%
ActionBack Arsenal at DraftKings
🎯
Sharp vs Soft Book Value
Proven
Pinnacle is the sharpest sportsbook in the world. When soft books like DraftKings or Bet365 offer better odds than Pinnacle, the soft book is mispriced.
Example signal
EventLakers vs Celtics
Pinnacle58.3%
DraftKings55.1%
Gap+3.2%
ActionBack Lakers at DraftKings
💰
Cross-PM Arbitrage
Risk-free
When the same event trades at different prices on Kalshi vs Polymarket, buy low on one and sell high on the other. Guaranteed profit, zero risk.
Example signal
EventTrump Approval > 50%
Buy Kalshi38.2c
Sell Polymarket44.7c
Edge6.5c (17%)
ActionBuy Kalshi + Sell Polymarket
🚀
PM Velocity / Line Movement
Coming soon
Prediction markets update in real-time. When PM prices move sharply (3%+ in minutes), sportsbooks haven't adjusted yet. We catch it first.
Example signal
EventChelsea vs Man United
PM Before52.0%
PM After (3 min)47.1%
SportsbooksStill at 51.8%
ActionFade Chelsea at sportsbooks
Data Sources

The widest cross-platform coverage

No other service combines prediction market order books with sportsbook odds in real-time.

Prediction Markets (Real-time WebSocket)
Sportsbooks (47+ bookmakers)
+41 more
Why OddSlice

The unfair advantage

Traditional arb scanners compare sportsbooks. We compare entirely different markets — prediction markets and sportsbooks — where pricing inefficiencies are larger and more persistent.

✅ What we do differently
Cross-market intelligence: PM order books + sportsbook odds in one scanner. Unique PM vs Sportsbook signals that nobody else can detect. Real-time WebSocket feeds from prediction markets (not delayed polling). Pinnacle as sharp reference enhanced with PM consensus as second confirmation.
❌ What others do
Traditional arb scanners (OddsJam, RebelBetting, OddsPedia) only compare sportsbooks against each other. They miss the entire prediction market dimension. Their gaps are smaller, more contested, and close faster because everyone uses the same data.
Pricing

Start finding value today

7-day free trial on all paid plans. Cancel anytime. No contracts.

Starter
$49/mo
billed monthly
  • ✓ PM vs Sportsbook signals
  • ✓ Cross-PM arb alerts
  • ✓ Real-time Telegram alerts
  • ✓ Bookmaker + link included
  • – Sharp vs Soft signals
  • – Line movement alerts
  • – Stake calculator
  • – API access
Pro
$99/mo
billed monthly
  • ✓ All Starter features
  • ✓ Sharp vs Soft signals
  • ✓ Line movement alerts
  • ✓ Stake calculator / Kelly
  • ✓ Sports + Politics
  • ✓ Historical performance
  • ✓ Telegram + Email
  • – API access
API
$199/mo
billed monthly
  • ✓ All Pro features
  • ✓ REST API access
  • ✓ Webhook delivery
  • ✓ Raw signal feed
  • ✓ Custom thresholds
  • ✓ Priority support
  • ✓ All verticals
  • ✓ Bulk historical data
FAQ

Common questions

What are prediction markets and why do they matter?▼
Prediction markets like Kalshi and Polymarket are real-money exchanges where people trade contracts on future outcomes. They aggregate information from thousands of participants into a real-time probability. When PM prices diverge from sportsbook odds, one side has information the other doesn't.
Is this legal?▼
Yes. OddSlice provides information and alerts, similar to any odds comparison service. We don't place bets or handle money. Kalshi is CFTC-regulated in the US. Sportsbook legality varies by state/country. You are responsible for ensuring betting is legal in your jurisdiction.
How are signals delivered?▼
Starter and Pro plans receive signals via Telegram direct message. Pro also gets email alerts. The API plan gets raw signal data via REST API and optional webhooks for real-time delivery to your own systems.
How fast are the signals?▼
Our scanner runs every 30 seconds. PM data arrives in real-time via WebSocket. Sportsbook data refreshes on a polling schedule. From detection to delivery, signals typically arrive within 60 seconds of the price gap appearing.
What sports and events are covered?▼
We cover all events that exist on BOTH prediction markets and sportsbooks. This currently includes EPL, Champions League, NBA, MLB, NHL, MMA/UFC, and US Politics. Coverage expands as prediction markets add more sports.
Can I cancel anytime?▼
Yes. All plans are month-to-month with no contracts. Cancel anytime from your Telegram settings. Your access continues until the end of your billing period.

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