> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.hellodata.ai/documentation/start-here/welcome-to-hello-data-api/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.hellodata.ai/_mcp/server.

# HelloData's API Documentation 👋

With HelloData's API, you can access daily updates on millions of multifamily properties, including rent & availability, concessions, fees, amenities, property manager reviews and more.

Our API is used by many of the largest owners, managers and PropTech companies across the U.S. to understand their markets and build data-driven products.

![Code looking for a property](/_fern-files/docs.hellodata.ai/ff28e144c32d22ee95b77a4bf5ee0a14b0838f3c713ecf100606ec62ff3ebfea/assets/code-example.png)

## API Endpoint Flow

Here's how our endpoints work together to provide comprehensive property analysis:

```mermaid
flowchart TD
    A["/property/search<br /><small>FREE - Text search</small>"] 
    B["/market/search<br /><small>Geographic filtering</small>"]
    C["/property/{id}<br /><small>Complete property data</small>"]
    D["/property/comparables<br /><small>Find similar properties</small>"]
    E["/property/pricing<br /><small>Rent recommendations</small>"]
    F["/property/expense_benchmarks<br /><small>Operating cost estimates</small>"]
    
    A["/property/search<br /><small>Search for a single property given a property name</small>"] -->|"Property IDs"| C
    B["/market/search<br /><small>Search for many properties within a geography, with optional filters</small>"] -->|"Property IDs"| C
    C -->|"PropertyDetailsResponse"| D
    C -->|"PropertyDetailsResponse"| E
    C -->|"PropertyDetailsResponse"| F
    
    style A fill:#e1f5fe
    style B fill:#fff3e0
    style C fill:#fff3e0
    style D fill:#e8f5e8
    style E fill:#e8f5e8
    style F fill:#e8f5e8
```

## Use Cases

We are customers of our own API, so we use it to power all our analyses and services.
Don't hesitate to visit our [platform](https://app.hellodata.ai?utm_source=hellodata\&utm_medium=api-docs) to see how we use our data to provide market insights, comparables, pricing recommendations, and more.
But you can also build much more by using our API along with your own data and services. Here are some ideas:

* **PowerBI Dashboards**: Pull in daily updates on every institutional multifamily property in the country, including unit-level historical rent and concessions data.
* **Deal Sourcing**: Identify value-add investment opportunities at scale, or use our data in aggregate to identify properties with specific attributes (e.g. swimming pools, golf simulators, etc.) for business development.
* **Excel Models**: Bring detailed market data directly into your Excel models to analyze deals faster.
* **Track Your Competition**: Understand your competitor's pricing strategy, check how often they change their prices, on which days, and by how much. Detect if they use dynamic pricing or revenue management.
* **Market Analysis**: Track new units hitting the market, analyze trends in rent and leasing velocity, and understand the distributions of pricing and concessions in granular detail.
* **Chatbots**: Power your chatbot with real-time data to answer questions about properties and pricing.

And all of that is doable with only a handful of endpoints and a simple API. Let's get started!

## Authentication / API Key

> **Note**
>
> All you need is an API key, contact us to get started.

## Frequently Visited Resources

#### [API Reference](/api-reference)

#### [Try an example](/docs/property-search)

#### [Our Data](https://www.hellodata.ai/our-data)

#### [Website](https://www.hellodata.ai)

#### [Schedule a Demo](https://www.hellodata.ai/multifamily-market-analysis-demo)

## Need Help?

If you need help, don't hesitate to contact us using our chat or by email at [support@hellodata.ai](mailto:support@hellodata.ai).

> Make real-time data your competitive advantage!