> AI agents: this is one page from PostHog's docs. Full index of Markdown docs for LLMs: https://posthog.com/llms.txt

# Linking RentCast as a source

Canonical URL: https://posthog.com/docs/data-pipelines/sources/rentcast

> **Cloud region:** This page uses US Cloud hosts. For an EU Cloud project, use `https://eu.posthog.com` instead of `https://us.posthog.com` or `https://app.posthog.com` (app host for links).

## On this page

- [Prerequisites](#prerequisites)
- [Adding a data source](#adding-a-data-source)
- [Sync modes](#sync-modes)
- [Configuration](#configuration)
- [Supported tables](#supported-tables)
- [Markets table](#markets-table)
- [Troubleshooting](#troubleshooting)

**Beta release**

This source is currently in **beta**. It works end to end, but you may still hit rough edges. [Let us know](https://us.posthog.com/#panel=support%3Asupport%3Adata_warehouse%3A%3Atrue) if you do.

![](https://res.cloudinary.com/dmukukwp6/image/upload/texture_tan_9608fcca70)

![](https://res.cloudinary.com/dmukukwp6/image/upload/texture_tan_dark_a92b0e022d)

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`

![PostHog Wizard hedgehog](https://res.cloudinary.com/dmukukwp6/image/upload/wizard_3f8bb7a240.png)

![](https://res.cloudinary.com/dmukukwp6/image/upload/wizard_3f8bb7a240.png)Let AI connect your sources for you

The RentCast connector pulls US real estate data — property records, active sale listings, long-term rental listings, and ZIP-level market statistics — 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, active sale and rental listings, and market statistics.
-   **ZIP codes for market statistics** *(optional)* – a comma-separated list of 5-digit US ZIP codes (e.g. `29611, 78701`). Only needed if you want to sync the `markets` table. Each ZIP code uses one RentCast API request per sync.

## 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](https://posthog.com/docs/data-pipelines/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 | Description |
| --- | --- |
| `API key` **Type:** password **Required:** True |  |
| `ZIP codes for market statistics` **Type:** text **Required:** False | A comma-separated list of 5-digit US ZIP codes. Only the markets table uses it. |

## 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 | — | — |
| `markets` | Aggregate sale and rental market statistics and monthly historical trends for one US ZIP code. | Full refresh | — | — |

| 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 | — | — |
| `markets` | Aggregate sale and rental market statistics and monthly historical trends for one US ZIP code. | Full refresh | — | — |

## Markets table

The `markets` table provides sale and rental statistics for the ZIP codes you configure. Unlike the other tables, it requires at least one ZIP code to sync — if no ZIP codes are set, the table is disabled by default.

Each ZIP code makes one API request per sync. If RentCast has no data for a particular ZIP code, that ZIP code is skipped and the sync continues.

## 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 you see **"The RentCast markets table needs at least one ZIP code"**, add at least one 5-digit US ZIP code to the source settings.
-   If you see **"RentCast ZIP codes must be 5-digit US ZIP codes"**, check that each ZIP code is exactly 5 digits and entries are comma-separated.

If your sync is failing or data looks wrong, see the [Data warehouse troubleshooting guide](https://posthog.com/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.