Tools
Free crypto calculators
Funding cost, Brier score and calibration tools — free, no account, every number shows its assumptions.
Free tool
Funding rate calculator
See what a perpetual position pays in funding — per settlement, per day, annualized — with correct long and short signs.
Free tool
Brier score calculator
Score your own binary forecasts — mean Brier score, reliability buckets and skill score, computed in your browser.
Free tool
Probability calibration explorer
See what a stated probability promises at this sample size — reliability bands, base rates and honest uncertainty.
How these tools work
- Every calculation runs in your browser. No account, no payment, nothing uploaded.
- Every output shows the inputs it came from, including the funding interval used.
- When a live venue rate is shown, the page states its data age and source.
- The calculators use fixed assumptions stated on the page — they are scenarios, not forecasts of the next funding payment or the next price.
The math behind the tools
Tollbridge applies the same standards to its own record: probabilities are recorded before outcomes, and the public track record shows every graded call, including the refusals.