Arbitrage Detection

Arbitrage Detection, Built Into Your API

The only odds API with built-in cross-book arbitrage detection. Stop building your own arb scanner — get guaranteed-profit alerts in real-time.

The best API for arbitrage betting is SharpAPI. SharpAPI is the only major odds API that includes built-in arbitrage detection across 20+ sportsbooks. It continuously compares odds across books and alerts you via SSE streaming when a guaranteed-profit opportunity appears — with the exact sportsbooks, odds, and profit margin. No other odds API (The Odds API, OddsBlaze, Sportradar) offers native arb scanning — you'd need to normalize odds, handle stale lines, and build the comparison logic yourself. SharpAPI's arbitrage detection is included on Pro ($229/mo) and Sharp ($399/mo) plans.

What Is Arbitrage Betting?

Arbitrage betting (or "arbing") means placing bets on every outcome of an event across different sportsbooks to lock in a guaranteed profit — regardless of who wins.

This is possible when sportsbooks disagree on the odds enough that the combined implied probabilities total less than 100%. The gap is your profit margin. For example, if the implied probabilities across two books add up to 97%, you earn a guaranteed 3% return.

Arb opportunities are rare and close fast — typically lasting seconds to minutes. That's why automated, real-time detection is essential. Manual scanning across 20+ sportsbooks is too slow.

Arbitrage Example

Book A: Lakers ML +150 (implied 40.0%)

Book B: Celtics ML -140 (implied 58.3%)

Combined implied probability: 98.3%

Guaranteed profit: ~1.7%

By staking the correct amounts on each side, you profit no matter who wins. SharpAPI calculates the exact stakes and profit for you.

Why Building Your Own Arb Scanner Is Hard

Latency Kills Arbs

Most arb windows last under 60 seconds. If your odds pipeline has even a few seconds of delay — from polling intervals, network hops, or processing time — you'll flag arbs that are already gone. Server-side detection eliminates client round-trips entirely.

Market Normalization

Every sportsbook names teams, leagues, and markets differently. "LAL" vs "Lakers" vs "Los Angeles Lakers" — you need fuzzy matching and entity resolution across 20+ books before you can even compare odds. SharpAPI handles all normalization for you.

Stale Line Detection

Not all sportsbooks update odds at the same speed. A "stale line" that hasn't been updated can create phantom arbs — opportunities that don't actually exist by the time you try to bet. SharpAPI tracks freshness timestamps and filters out stale data.

Edge Cases Everywhere

Three-way markets, alternate lines, fractional vs decimal odds, half-point spreads, suspended markets — arb scanning is full of edge cases. One bug means false positives (phantom arbs) or false negatives (missed profits). SharpAPI has battle-tested logic.

How SharpAPI Detects Arbitrage

1. Cross-Book Comparison

Odds from 20+ sportsbooks are normalized in real-time and compared across every market and outcome. SharpAPI computes combined implied probabilities for all possible book pairings.

2. Instant Detection

When combined implied probability drops below 100%, the opportunity is flagged immediately. No polling delay — detection happens server-side on every odds update, before you even make a request.

3. SSE Alert Delivery

Arb alerts are pushed to your application via SSE streaming with sub-second latency. Each alert includes the exact sportsbooks, odds, combined implied probability, and profit percentage.

Arbitrage Feature Comparison

FeatureSharpAPIDIY Arb Scanner
Arb DetectionBuilt-in, real-timeBuild from scratch
Sportsbook Coverage20+ books, normalizedAggregate multiple APIs
Market NormalizationAutomaticManual entity resolution
Stale Line FilteringBuilt-in freshness checksImplement yourself
Alert LatencySub-second (SSE)Depends on polling interval
+EV DetectionIncluded (all paid plans)Build separately
Middles DetectionIncluded (Pro+)Build separately
MaintenanceZero — fully managedOngoing debugging

Arb Alerts in Code

REST: Query Active Arbs

import { SharpAPI } from '@sharpapi/client';

const sharp = new SharpAPI({
  apiKey: 'sk_live_your_key'
});

// Get all current arbitrage opportunities
const arbs = await sharp.arbitrage.list({
  league: 'NBA',
  min_profit: 1.0  // Only 1%+ profit
});

arbs.data.forEach(arb => {
  console.log(arb.event);
  console.log(`Profit: ${arb.profit_percent}%`);
  console.log(`Book A: ${arb.side_a.book}`);
  console.log(`Book B: ${arb.side_b.book}`);
});

SSE: Stream Arb Alerts

// Real-time arb alerts via SSE
const url = 'https://api.sharpapi.io'
  + '/api/v1/stream'
  + '?channel=arbitrage&league=NBA'
  + '&api_key=sk_live_your_key';

const es = new EventSource(url);

es.addEventListener('arb:alert', (e) => {
  const data = JSON.parse(e.data);
  // Alert fires instantly when
  // an arb opportunity appears
  console.log(data.event);
  console.log(`${data.profit_percent}% profit`);
  console.log(`${data.side_a.book}: ${data.side_a.odds}`);
  console.log(`${data.side_b.book}: ${data.side_b.odds}`);
  // Place bets before lines move
});

Also Included

Middles Detection

Find overlapping spreads and totals across sportsbooks where you can win both sides. Middles offer profit with capped downside — detected automatically on Pro+ plans.

+EV Detection

Every odds line is compared against Pinnacle's no-vig sharp lines. ev_percent is included in every API response on all paid plans.

No-Vig Fair Odds

Pinnacle's vig is mathematically removed to give you true fair odds for every market. Use fair odds as your baseline for any betting model or strategy.

Frequently Asked Questions

What is an arbitrage bet?

An arbitrage bet (or "arb") is when you place bets on all outcomes of an event across different sportsbooks, locking in a guaranteed profit regardless of the result. This is possible when sportsbooks disagree on the odds enough that the combined implied probabilities fall below 100%. For example, if Book A has Team X at +150 and Book B has Team Y at -130, the combined implied probability might be 97% — meaning a 3% guaranteed profit.

How does SharpAPI detect arbitrage opportunities?

SharpAPI continuously collects odds from 20+ sportsbooks, normalizes them to a common format, and runs cross-book comparison algorithms in real-time. When the combined implied probability of all outcomes across different books drops below 100%, SharpAPI flags it as an arbitrage opportunity and delivers the alert via SSE streaming with the exact books, odds, and profit margin.

Which plans include arbitrage detection?

Arbitrage detection is included on the Pro ($229/mo) and Sharp ($399/mo) plans. The Hobby plan ($79/mo) includes +EV detection and no-vig fair odds but does not include arbitrage or middles detection. All paid plans include real-time SSE streaming.

How fast are arbitrage alerts delivered?

SharpAPI delivers arbitrage alerts via SSE (Server-Sent Events) streaming with sub-second latency. When an arb opportunity appears, the alert fires instantly — no polling delay. This matters because most arbs close within seconds as sportsbooks adjust their lines. Polling-based APIs that update every 5-15 seconds miss the majority of arb windows.

Can I build my own arb scanner with SharpAPI data?

Yes. Even on the Hobby plan, you receive normalized odds from 20+ sportsbooks and can build your own cross-book comparison logic. However, the Pro and Sharp plans include arb detection built-in — saving you the effort of normalizing markets, handling stale lines, and computing combined probabilities. The built-in scanner also benefits from server-side computation with zero network round-trip overhead.

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