> For the complete documentation index, see [llms.txt](https://docs.optiondata.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optiondata.io/welcome.md).

# Welcome!

Welcome to OptionData.io API Documentation

Optiondata.io offers simple, modern API-first solutions to enable anyone, either individuals or businesses, to build algorithms to analyze U.S. stock option trades.

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The market we support currently:

U.S. Stock option trades
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### Read our API documentation

[Realtime Option Data API](/websocket-data-api/realtime-option-data-api.md) and [Historical Option Data API](/http-data-api/historical-option-data-api.md)
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### Get your API Key at our portal website

[OptionData Portal](https://portal.optiondata.io/)
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### Test the API on our portal

[OptionData Portal](https://portal.optiondata.io/)
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### Pay upfront and start your API service

[OptionData Portal](https://portal.optiondata.io/)
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### Reach out to us if you have any question

Email: `support@optiondata.io`

WhatsApp                    Telegram

<div align="left"><figure><img src="https://1362181483-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDJROLvMer7QV5Op2yce2%2Fuploads%2FIzsXYQ5XS5nLW8jgrEtC%2Fimage.png?alt=media&amp;token=db684129-f451-4c70-b8ef-0b7aed44bbef" alt="" width="146"><figcaption></figcaption></figure> <figure><img src="https://1362181483-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDJROLvMer7QV5Op2yce2%2Fuploads%2F98TyTOVRgNxrL0hKzPtE%2Fimage.png?alt=media&amp;token=a7a6f261-9a07-43dd-983a-33b576c179f3" alt="" width="164"><figcaption></figcaption></figure></div>

Discord: <https://discord.com/invite/mE5pEDMdWs>

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