Rolling return correlation matrix for a list of tickers. Returns full pairwise matrix, strongest/weakest pairs, and a po

Rolling return correlation matrix for a list of tickers. Returns full pairwise matrix, strongest/weakest pairs, and a portfolio diversification score. Use before building a playbook to validate peer independence, or to check hedge ratios. PARAMS: tickers — comma-separated symbols (2–20), e.g. NVDA,AMD,MSFT,QQQ period — '30d' | '90d' | '6mo' | '1y' | '2y' | '3y' (default '1y') method — 'pearson' | 'spearman' (default 'pearson') POST /correlation_matrix?tickers=NVDA,AMD,MSFT,QQQ&period=1y PRICING: $0.05 per call.