FinzData

FinzData gives Claude research-grade US market data built for backtesting. Ask for a stock universe as of any past date and get every name that traded then, including companies that later delisted. Pull daily and intraday bars, point-in-time fundamentals and daily valuation metrics built from SEC filings, macro series exactly as they were first published (ALFRED vintages), CFTC Commitments of Traders positioning, 13F institutional holdings and an earnings and economic-release calendar. Every data tool takes an as_of date, so answers contain only what was public on that day — no look-ahead bias. Run backtests server-side: describe a strategy (momentum, moving-average cross, factor ranks, or a formula over prices; long-only or long/short) and FinzData returns CAGR, volatility, Sharpe, drawdown, turnover, an equity curve, an equal-weight benchmark, a deflated-Sharpe overfitting check and a reproducible run ID. Identical reruns are free and compare_runs puts several side by side. Tools: search_datasets, describe_dataset, get_universe, get_bars, get_fundamentals_pit, get_macro_vintage, get_cot, get_13f, get_events, run_backtest, compare_runs. All are read-only. Free accounts cover the last 12 months with 100 data calls and 5 backtests a day. Paid plans and prepaid credits ($0.001 per data call, $0.05 per backtest) unlock full history. Results are historical simulations, not investment advice.