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Short interest for a US stock: shares short, average daily volume, days to cover, change, per FINRA settlement date (twice a month), newest first.

Daily short sale volume and total volume per symbol from FINRA's Reg SHO files since August 2021, with the short share of volume.

SEC fails-to-deliver quantity and price by settlement date for a symbol since January 2010 (from, to and limit select the window, up to 5,000 dates), or the latest settlement's largest fails by value.

Insider transactions from SEC Form 4: insider name and title, transaction code, shares, price, value, date.

Companies where several different insiders bought their own stock on the open market within a window (Form 4 transaction code P only): distinct buyers with titles, trades, combined value, first and latest trade dates.

Reg SHO threshold lists from the Nasdaq and Cboe daily files since 2022: securities whose fails to deliver stayed above the threshold for five settlement days.

Form 144 notices: an affiliate's planned sale of restricted or control stock (seller, shares, approximate market value, planned date), filed before the trade.

Holders above 5% from Schedule 13D (active) and 13G (passive) cover pages: holder, shares, percent of class, filing date.

Which tracked 13F managers (Berkshire, Bridgewater, Citadel, Renaissance and others) held a ticker at their latest quarterly filing: shares, value, share of portfolio, change.

The latest 13F portfolio of one tracked manager by slug, e.

Quarterly revenue, net income and diluted EPS (calendar quarters, fourth quarter derived from the annual report), annual revenue, net income, operating cash flow, capex, buybacks and dividends, and the latest balance sheet instants, from the company's own XBRL filings.

8-K current reports with their item numbers (2.

When US companies report results, from their own 8-K filings.

Weekly CFTC positioning: the latest report across all tracked markets, or one market's history (e.

Current perpetual funding rates on Binance, Bybit, OKX, Hyperliquid, Kraken and BitMEX for tracked crypto symbols (hourly venues shown as the 8-hour equivalent), or one symbol's history by slug (e.

Weekly US net liquidity (Fed balance sheet minus the Treasury General Account minus reverse repo) with its components, oldest first, or one FRED series (WALCL, WRESBAL, RRPONTSYD, WTREGEN, SOFR, EFFR, IORB, WSHOSHO).

Policy rates for 49 economies: the current table, or one country code's history (e.

US Treasury yield curve points, curve spreads and stablecoin supply as daily series.

Treasury auction results and calendar since 2010 from TreasuryDirect: security type and term, auction and issue dates, offering amount, high yield or discount rate, bid-to-cover, dealer, direct and indirect allotments.

Scheduled US releases from the agencies' own calendars (CPI, PPI, payrolls, weekly jobless claims, PCE, GDP, retail sales, housing, durable goods, industrial production, trade, FOMC decisions and minutes, Beige Book), with the actual and previous print filled after release and a unit field.

Form D notices of exempt offerings: issuer, amount sold, amount offered, investors, whether it is a pooled fund.

S-1 and F-1 registration statements, 424B4 final prospectuses, EFFECT notices and RW withdrawals from EDGAR, with the filer's listing status.

Bitcoin holdings of public companies from their own XBRL filings: coins, fair value, cost basis, as of the filing period.

Largest US federal contract actions from USAspending, optionally summed by listed parent company (by=ticker) or filtered to one ticker.

Open interest history for a symbol slug, recent liquidations across exchanges, Deribit options metrics (put/call, max pain, DVOL) for BTC or ETH, or Hyperliquid whale positions.

How the underlying free API works: endpoints, parameters, rate limits, CSV downloads and the attribution terms.