Contract specification
Spec | Details |
Underlying | Bitcoin (BTC) spot price in USD |
Price index | CF Benchmarks Bitcoin Real-Time Index (BRTI) |
Index update frequency | 1 second |
Contract type | Linear (USD-margined) |
Contract size | 0.0001 BTC per contract |
Min. position | 1 contract (~$8 at current prices) |
Trading hours | 24/7 (with exception to maintenance) |
Clearing | Kalshi Klear LLC (CFTC-regulated DCO) |
Settlement cycles | 12:00 PM ET and 4:00 PM ET daily |
Funding times | 12:00 AM, 8:00 AM, and 4:00 PM ET |
Funding rate cap | +2% / –2% per 8-hour interval |
Margin type | Isolated (in Kalshi apps), portoflio via API |
What is the CF Benchmarks BRTI?
The CF Benchmarks Bitcoin Real-Time Index (BRTI) is an institutional-grade spot price benchmark for Bitcoin. It aggregates prices from multiple regulated cryptocurrency exchanges and updates every second. It is widely used across regulated derivatives markets globally.
Kalshi uses the BRTI as the reference price for funding rate calculations and settlement. When you see 'oracle price' or 'index price' in the product, this is the BRTI.