Bitcoin CPI falls 19.30% in September but rises 43.75% year over year
- —BTCCPI fell 19.30% month over month in September
- —The index rose 43.75% year over year
- —August saw a 6.56% monthly drop and 90% annual gain
- —Launched in May 2025 for institutional investors and treasurers
Why it matters: The index tracks Bitcoin's purchasing power: a positive annual reading means the consumer basket costs more BTC than a year earlier.
Source: Crypto Briefing