Free tools that answer the two questions every prediction market trader asks: what will this trade actually cost me, and what can I legally trade where I live? No sign-up, no email capture — enter your details and get the answer.
Both tools use the same data as our platform reviews: published fee schedules and current regulatory status, updated when platforms or courts change the rules.
Fee Calculator
Platforms quote fees in incompatible ways — a formula based on contract price, a flat percentage of payout, a maker/taker split. That makes “which platform is cheaper?” genuinely hard to answer in your head, and the answer changes depending on the contract price.
The fee calculator does the math for you: enter your trade size and contract price, and see the exact fee on each platform side by side. Useful before any large trade — the fee difference between platforms on the same position can be several dollars per hundred traded.
→ Compare fees on your next trade
Legality Checker
Prediction market availability is a moving target: platforms are federally regulated, but several states have challenged specific contract types, and sports markets in particular vary by state. What’s available in Texas isn’t what’s available in Massachusetts.
Select your state and the legality checker shows which platforms and which market categories are currently available to you, including active court injunctions. We update it as rulings come in.
→ Check what’s available in your state
Coming Next
Two more tools are in development:
- Odds Converter — translate between prediction market contract prices, American betting odds, decimal odds, and implied probability.
- Position Size Calculator — work out how many contracts to buy given your bankroll, risk tolerance, and the contract price.
Want a tool that doesn’t exist yet? Tell us what would help — the two tools above exist because traders asked for them.
How the Numbers Stay Current
Tool data comes from the same research pipeline as our platform reviews: official fee schedules, CFTC filings, and state regulatory actions. When a platform changes its fees or a court changes what’s tradable, we update the tools and note the change. If you spot a number that looks wrong, report it and we’ll verify it against the primary source.