{"name":"token-volatility","description":"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.","price":"$0.005","method":"POST","input_schema":{"properties":{"coingecko_id":{"type":"string","description":"CoinGecko coin id (e.g. 'ethereum', 'bitcoin', 'solana'). Lower-case slug, not the symbol."},"days":{"type":"number","description":"Lookback window in days. Range [7, 365]. Default 30."}},"required":["coingecko_id"]},"input_example":{"coingecko_id":"ethereum","days":30},"output_example":{"coingecko_id":"ethereum","days":30,"returns_count":30,"daily_volatility_pct":3.421,"annualized_volatility_pct":65.3742,"first_price_usd":3142.55,"last_price_usd":3284.13,"source":"coingecko"},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}