Token volatility / historical volatility / annualized vol / standard deviation of returns / crypto vol calculator. For any CoinGecko-listed token, computes log-return standard deviation over the last N days (default 30) and annualizes by sqrt(365). Returns daily and annualized volatility as percent, count of return observations, first and last close prices. Backed by CoinGecko's free public market_chart endpoint.

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