> 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!

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="/files/8IVXZGTdE6n1M5DfHJom" alt="" width="146"><figcaption></figcaption></figure> <figure><img src="/files/Wkb9xYZ98hbo4KMSXWHq" alt="" width="164"><figcaption></figcaption></figure></div>

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

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