EventArb vs Line Check
EventArb and Line Check are both filed under Arbitrage. Both are trading platforms, and both are free. Below: the facts side by side, where the two actually differ, and when each one is the better pick.
Free cross-platform arbitrage calculator for event contracts.
Compared with Line Check
Odds-comparison tool that pits Polymarket against SX Bet side by side.
Compared with EventArbAt a glance
| Fact | EventArb | Line Check |
|---|---|---|
| Type | Trading platform | Trading platform |
| Category | Arbitrage | Arbitrage |
| Also listed in | — | Sports Trading |
| Pricing | Free | Free |
| Price | free | free |
| Risk rating | Low risk | Low risk |
| Markets | Polymarket, Kalshi, Robinhood | Polymarket, SX Bet, Sports |
| Source | Source not published | Source not published |
| Runs in Telegram | No | No |
| Listed since | Aug 26, 2026 | Jul 3, 2026 |
Highlighted rows differ
Key differences
- Both list Polymarket; EventArb adds Kalshi and Robinhood; Line Check adds SX Bet and Sports.
- Only Line Check is filed under Sports Trading.
- Line Check has been listed since Jul 3, 2026; EventArb joined on Aug 26, 2026.
Choose EventArb if…
- you trade Kalshi and Robinhood
Choose Line Check if…
- you trade SX Bet and Sports
- your focus is Sports Trading
What EventArb does
Free cross-platform arbitrage calculator for event contracts. Punch in YES/NO prices for the same event on Polymarket, Kalshi or Robinhood and it does the math each venue's fee schedule implies — whether buying opposite sides locks in a profit, what the spread nets after fees, and the opportunity cost of parking capital until resolution. Supports binary and multiple-choice markets, side-by-side venue comparison, shareable links and free email notifications when opportunities open.
Features- Fee-aware arbitrage math for Polymarket, Kalshi and Robinhood
- Binary and multiple-choice market modes
- Opportunity-cost model over the contract length
- Side-by-side comparison across venues
- Shareable calculation links
- Enter the same market's YES/NO prices as listed on each venue.
- It nets out each platform's fees and flags when buying opposite sides locks in more than they cost.
- Weighs the locked spread against the opportunity cost of capital for the contract's duration.
What Line Check does
Odds-comparison tool that pits Polymarket against SX Bet side by side. Shows American, decimal and implied-probability formats, highlights the best-edge opportunity and optimal payout, and lets you size a custom bet across NBA, MLB, NHL, UFC and major soccer leagues.
Features- Side-by-side Polymarket vs SX Bet odds
- American, decimal and implied-probability formats
- Best-edge and optimal-payout detection
- Custom bet-amount calculations
- Sort by start time, best edge or alphabetically
- Compares the same market's odds on Polymarket and SX Bet.
- Converts to American, decimal and implied probability at a glance.
- Flags which venue offers the best edge and payout.
More head-to-heads
Every fact on this page is taken from the two listings as their authors publish them; POLBOTS verifies neither performance nor claims and has no stake in either tool. Nothing here is financial advice.