Polytoolhub
What is EventArb?
EventArb is a focused calculator for comparing event-contract prices. Its form lets you add markets, select a venue and distinguish binary from multiple-choice structures. Contract length and principal let the result include capital commitment and opportunity-cost context instead of treating a quoted spread as the whole calculation.
Who it is for
- Users checking the arithmetic of a cross-venue position
- Researchers comparing binary and multi-outcome structures
- Traders assessing how long capital is tied up
Features and coverage
- Available on
- Web
- Markets & venues
- Polymarket
- Venue selection
Compare supported prediction-market venues.
- Binary and multiple choice
Choose the outcome structure appropriate to the event.
- Multiple market legs
Add another market to the calculation.
- Principal input
Set the capital amount used in the scenario.
- Duration input
Include contract length in days.
- Fee-aware comparison
The calculator describes spreads with fees included.
- Method explanation
Open How to Guide and The Math.
- Share workflow
Use the interface’s sharing control for a scenario.
Workflows with EventArb
Check a two-venue spread
Enter the relevant outcome prices and principal, calculate and inspect the fee assumptions.
Compare capital use
Change the contract duration while holding prices constant to understand the time dimension.
Validate the structure
Read every contract’s rules before treating the outcomes as complementary.
Pricing and total cost
The public calculator is free to use. An optional donation link and free arbitrage-alert signup are shown.
Getting started
Before you start: The calculator does not place or synchronize orders.
- Choose the contract structure.
- Enter duration and principal.
- Select venues and prices.
- Add the required market legs.
- Calculate and read the math assumptions.
Useful links
What to check
- The calculator does not place or synchronize orders.
- Different settlement definitions can invalidate an apparent complementary position.
- Quoted prices and available size can change between calculation and execution.
A closer look
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Frequently asked questions about EventArb
Can I add more than one market?
Yes.
Does it consider contract duration?
The form includes days to completion.
Does it execute both legs?
No execution workflow is shown.