{
  "markdown": "# HF Data Library\n\nFree 1-minute OHLCV bars for 1,391 U.S. stocks and ETFs, December 2002 → present, updated daily.\n\n**Website / downloads:** https://hfdatalibrary.com · **API:** https://api.hfdatalibrary.com · **DOI:** [10.5281/zenodo.19501605](https://doi.org/10.5281/zenodo.19501605)\n\n## Licensing\n\nThis project uses different licences for code and for data.\n\n- **Code** — API clients, MCP server, pipeline, and Worker source: **MIT** (see [`LICENSE`](LICENSE))\n- **Data and documentation** — all datasets and derived measures: **CC BY 4.0** (see [`LICENSE-DATA`](LICENSE-DATA))\n\nData obtained after March 2022 is additionally subject to the\n[IEX Historical Data Terms of Use](https://www.iex.io/legal/hist-data-terms).\nData before March 2022 is sourced from PiTrading under their terms.\n\nWhen using the data, cite *Elkassabgi, A. (2026). HF Data Library: Free 1-Minute\nIntraday U.S. Equity Data. Zenodo.* <https://doi.org/10.5281/zenodo.19501605>\n\n## Data sources\n\n| Period | Source | Coverage |\n|---|---|---|\n| Dec 2002 – Mar 2022 | PiTrading (consolidated tape, CTA/UTP) | All U.S. equity exchanges |\n| Mar 2022 – present | IEX Exchange market data (HIST pcap files) | IEX exchange only, ~2–3% of consolidated volume — a reference point, not the full tape |\n\nPost–March 2022 bars reflect IEX-only trading activity. Some tickers have no IEX trades on a given day. See [Known Issues](https://hfdatalibrary.com/pages/issues) before using the post-2022 segment for research.\n\n## Upstream source attribution (required)\n\nBars dated 2022-03-07 onward are derived from IEX market data. If you redistribute or provide access to this data, include:\n\n> Data provided for free by IEX. By accessing or using IEX Historical Data, you agree to the [IEX Historical Data Terms of Use](https://www.iex.io/legal/hist-data-terms).\n\nIEX retains all rights in the underlying securities information.\n\n## Repository contents\n\nThis repo holds the website (`index.html`, `pages/`), the Cloudflare Worker API (`api/`), and the daily data pipeline (`pipeline/` — IEX HIST pcap download, Go TOPS parser, bar building, 9-step cleaning, R2 upload). The data itself is distributed from https://hfdatalibrary.com, not from this repository.\n\nThe MCP server that exposes this library (and the Econ and IP libraries) to AI assistants\nlives in its own repository: [elkassabgidata-mcp](https://github.com/elkassabgi/elkassabgidata-mcp) — MIT licensed.\n",
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