# Linking RentCast as a source - Docs

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Let AI connect your sources for you

Skip the manual setup — run this in your project and the wizard auto-detects your databases and APIs and connects them to PostHog.

`npx @posthog/wizard warehouse`

[Learn more](/wizard.md)

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**Alpha release**

This source is currently in **alpha**. The interface and available tables may change.

The RentCast connector pulls US real estate data — property records, active sale listings, and long-term rental listings — into the PostHog Data warehouse, so you can analyze it alongside your product data.

## Prerequisites

You need a RentCast account with an API key. RentCast is a property-lookup API billed per request.

## Adding a data source

1.  In PostHog, go to the [Sources tab](https://app.posthog.com/data-management/sources) of the data pipeline section.
2.  Click **\+ New source** and click **Link** next to this source.
3.  Enter your credentials (see [Configuration](#configuration) below) and click **Next**.
4.  Select the tables you want to sync, choose a sync method and frequency, then click **Import**.

Once the syncs are complete, you can start querying this data in PostHog.

When linking RentCast, you'll need:

-   **API key** – create a key under **API dashboard** in [RentCast](https://app.rentcast.io/app/api). The key grants read access to property records and active sale and rental listings.

## Sync modes

Each table can be synced in one of several modes, depending on what the source supports:

-   **Webhook** (when available) – the source pushes changes to PostHog in real time. Fastest freshness, lowest ongoing cost, and the only mode that reliably captures updates and deletes.
-   **Incremental** – only new or updated rows are synced on each run, using a cursor field (such as an `updated_at` timestamp). Cheaper than a full refresh, but deletes aren't captured.
-   **Append only** – new rows are appended using a cursor field; existing rows are never updated. Ideal for immutable, append-only tables like event logs.
-   **Full refresh** – the whole table is reloaded on every sync. Use it when a table has no reliable cursor or when you need deletions reflected.

See [sync methods](/docs/cdp/sources.md#sync-methods) for a full explanation of how each mode works and how to choose between them.

This source is full refresh only. RentCast does not expose a server-side timestamp filter, so incremental sync is not available.

## Configuration

| Option | Type | Required |
| --- | --- | --- |
| API key | password | Yes |

## Supported tables

| Table | Description | Sync method | Incremental field | Primary key |
| --- | --- | --- | --- | --- |
| properties | A US property record, including its address, physical attributes, ownership, and sale history. | Full refresh | — | — |
| sale_listings | An active or recently seen property sale listing. | Full refresh | — | — |
| rental_listings | An active or recently seen long-term rental listing. | Full refresh | — | — |

## Troubleshooting

-   If you see a **401 Unauthorized** error, your RentCast API key is invalid or has been revoked. Generate a new key in the [RentCast API dashboard](https://app.rentcast.io/app/api), then reconnect.
-   If you see a **403 Forbidden** error, your API key does not have access to the requested data. Check the key's plan and permissions, then reconnect.
-   RentCast enforces per-minute rate limits. If syncs are slow or temporarily failing, this is likely due to rate limiting — the connector retries automatically.

If your sync is failing or data looks wrong, see the [Data warehouse troubleshooting guide](/docs/data-warehouse/troubleshooting.md). If that doesn't help, [contact support](https://us.posthog.com/#panel=support%3Asupport%3Adata_warehouse%3A%3Atrue) – we're happy to help.

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