As prediction markets mature, price discrepancies between platforms create guaranteed profit opportunities. While single-platform arbitrage (YES+NO < $1) grabs headlines, cross-platform arbitrage—exploiting the same event priced differently across Polymarket, Kalshi, and PredictIt—delivers higher edges with lower competition.
Real example: "Will Bitcoin hit $100K by March 31?" trades at 78¢ YES on Polymarket vs 72¢ YES on Kalshi. Buy Kalshi, short Polymarket, collect 6¢ guaranteed (minus fees).
Why Cross-Platform Works (The Math)
Core principle: Identical events should price identically across platforms. They don't because:
- Different user bases (crypto degens vs traditional bettors)
- Varying liquidity ($10M vs $100K order books)
- Platform-specific fees (0.5% vs 2%)
- Resolution source trust differences
Edge calculation:
Profit = |PlatformA_price - PlatformB_price| - (feeA + feeB + slippage)
Minimum viable: 3-5% spread after costs
2026 stats: Cross-platform arb yields 2-3x higher frequency than single-platform, with 4-8% average edges vs 1-3%.
Platform API Comparison
| Platform | Event Coverage | API Quality | Latency | Fees | US-Friendly |
|---|---|---|---|---|---|
| Polymarket | Crypto/Politics | Excellent (CLOB) | 20ms | 0.5% | VPN needed |
| Kalshi | Finance/Weather | Good (REST) | 100ms | 2% | ✅ Yes |
| PredictIt | Politics only | Poor (scrape) | 5s | 5%+ | ✅ Yes |
Pro stack: Polymarket (crypto) + Kalshi (macro) covers 85% of high-volume opportunities.
Strategy Variants
| Type | Edge | Frequency | Complexity |
|---|---|---|---|
| Simple Spread | 3-6% | Daily | Low |
| **Triangular (3 platforms) | 5-10% | Weekly | Medium |
| Resolution Arb | 2-15% | Near expiry | High |
| Liquidity Weighted | 1-4% | Constant | Medium |
Pro move: Weight positions by platform liquidity to minimize slippage.
Production Architecture
Data → Normalization → Arb Detection → Risk Check → Execution
↓ ↓ ↓ ↓ ↓
Poly API Kalshi REST Spread Calc Position Multi-wallet
PredictIt Scraper NLP Mapping Limits execution
Latency budget:
- Data sync: <100ms
- Arb detection: <50ms
- Execution: <200ms total
Infra: Dual-region VPS (NYC + Chicago) = 99.99% uptime
Risk Management (Platform-Specific)
| Risk | Mitigation |
|---|---|
| Resolution mismatch | Manual event validation + same-source filter |
| API downtime | Multi-provider failover (Clob → REST) |
| Wallet bans | Separate hot wallets per platform |
| Liquidity traps | Min depth $50K both sides |
| Fees | Dynamic threshold (3% small trades, 1.5% large) |
Kill switch: Emergency close-all across all platforms
Relevant Article
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