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StockFit API

Structured SEC data for investors and quants

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What is StockFit API?

StockFit API provides structured, point-in-time SEC data for investors, quantitative researchers, and financial tool builders. All data is parsed directly from XBRL filings—10-Ks, 10-Qs, 8-Ks, and more—and updated daily from SEC EDGAR, ensuring every number comes with a full audit trail and no adjusted metrics.

The API delivers comprehensive coverage of US equities and ETFs, including income statements, balance sheets, cash flow statements, ownership and insider transactions, ETF holdings with look-through analysis, earnings calendars, and business model classifications. Endpoints are organized into intuitive modules like Financials, Ownership, ETFs, Filings, Earnings, and News.

Designed for backtesting and quant research, StockFit offers true point-in-time temporal rollback, quality scores (e.g., Altman-Z, Piotroski-F), and normalized statements across companies—including delisted ones—to eliminate lookahead and survivorship bias. It also integrates natively with AI tools via MCP, allowing your API key to become a research agent in Claude, Cursor, or VS Code.

  • Raw XBRL data with complete timestamps for audit-grade accuracy
  • Institutional ownership (13F) and insider flows (Forms 3/4/5) in one view
  • ETF composition, fund flows, and overlap analysis
  • Simple REST API with clear JSON responses and Swagger docs

How to use StockFit API

  1. 1

    Sign up at stockfit.com to get your free API key

  2. 2

    Explore the Swagger API documentation for endpoints like /api/financials/income-statement

  3. 3

    Send REST requests with your key to retrieve structured SEC data in JSON

  4. 4

    Integrate the data into your backtesting engine, research app, or AI assistant

  5. 5

    Use point-in-time queries to retrieve financials as of specific filing dates

Key features

Point-in-time financials with SEC filing timestamps and audit trail

Raw XBRL data, normalized statements, no adjusted metrics, and growth rates

Institutional ownership and insider transaction flow via 13F and Forms 3/4/5

ETF holdings look-through, overlap analysis, portfolio composition, and fund flows

AI-ready: MCP support for Claude, Cursor, VS Code to use your API key as a tool

Use cases

  • Eliminate lookahead bias in quantitative backtesting with temporally accurate financials
  • Build a research dashboard pulling income statements, balance sheets, and cash flows
  • Power an AI financial analyst by connecting StockFit to Claude or Cursor via MCP
  • Track institutional ownership changes and insider transactions for equity analysis
  • Analyze ETF portfolio overlap, composition, and fund flows for due diligence

Best for

QuantsBacktestersFinancial DevelopersAI ResearchersInvestorsFintech Startups

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Frequently asked questions about StockFit API

Common questions to help you decide if StockFit API is right for you.

Yes, we source from SEC EDGAR, providing 10-K, 10-Q, 8-K, S-1, 13F, DEF 14A, Forms 3/4/5, NPORT-P, and more via various endpoints for document retrieval and search.

Yes, every financial metric is timestamped to its SEC filing, enabling temporal rollback to eliminate lookahead bias in backtesting.

Yes, the Ownership API combines 13F holder data with beneficial owners and Form 3/4/5 transactions, plus share class data.

Yes, the ETF Holdings API offers full portfolio compositions from NPORT-P filings, including look-through, overlap analysis, fund flows, and fee history.

Yes, you can get a free API key to start testing. Visit stockfit.com for details and early-adopter pricing.

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