For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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DocumentationAPI Reference
DocumentationAPI Reference
  • Start here
    • Welcome to HelloData API
    • Authentication
    • Pricing
    • Changelog
  • Concepts
    • Rate Limits
    • Respecting Rate Limits
    • Common Error Codes
    • Common Calculations
    • Ingestion Timeline
    • Deprecations
  • Examples
    • Property Search
    • Property Details & History
    • Identify Comparables
    • Price Recommendations
    • Property ID Changes
    • Dataset Export
  • Support
    • Contact Us
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Authentication

It all starts with an API key...
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Pricing

How we charge for API usage
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The only step required to authenticate your requests is to include an API key in the header of your requests. Please contact us in the chat or at support@hellodata.ai so that we can generate a key for your account.

Once generated, you’ll be able to find your API key in the API section of the platform, and authenticate your requests by including it in a x-api-key header for each request.

Access your API key in the API section of the platform
Access your API key in the API section of the platform
$curl --location 'https://api.hellodata.ai/property/search?q=111%20w%20wacker' \
>--header 'x-api-key: <your-api-key>'