# Kuantum Property Signal — Listing Changes (`kuantum/property-signal`) Actor

Track real-estate listing changes, price movements, status updates, and new opportunities with Kuantum Property Signal. Build a timely property intelligence feed without manual monitoring. Start a run today and act on changes first.

- **URL**: https://apify.com/kuantum/property-signal.md
- **Developed by:** [\[R\] Kuantum](https://apify.com/kuantum) (community)
- **Categories:** Marketing
- **Stats:** 1 total users, 0 monthly users, 0.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

$15.00 / 1,000 evidenced source observations

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-event

## What's an Apify Actor?

Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
- **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`.
- **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`.
- **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`.
- **Any other language** — the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).

# README

## Kuantum Property Signal — Real Estate Listing Changes

Kuantum enterprise monitoring Actor. It delivers only successfully observed, evidenced changes; errors and unchanged observations are not charged.

This source is initially private beta until its live canary gate passes.

# Actor input Schema

## `targets` (type: `array`):

Public HTTPS real-estate listing pages you are authorized to monitor. The page must expose a qualifying listing as JSON-LD. Only structured price, availability, address, bedroom/bathroom, and floor-size fields are monitored; rendered text is not treated as listing data.

## `mode` (type: `string`):

Snapshot observes the supplied targets once. Monitor compares against the named private baseline store on later scheduled runs.

## `baselineStoreName` (type: `string`):

Required for monitor mode. Use a unique name per customer/task; this keeps the comparison baseline in your Apify storage.

## `maxResults` (type: `integer`):

Maximum number of target observations attempted in this run, capped at 100.

## `maxChargeUsd` (type: `number`):

Optional hard cap for the pilot price. The Actor stops before it can deliver more billable results than this allows.

## `webhookUrl` (type: `string`):

Optional HTTPS endpoint for a signed final run summary.

## `webhookSecret` (type: `string`):

Secret used to HMAC-sign the optional final webhook summary. It is never written to output.

## Actor input object example

```json
{
  "targets": [],
  "mode": "snapshot",
  "maxResults": 25
}
```

# Actor output Schema

## `dataset` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "targets": []
};

// Run the Actor and wait for it to finish
const run = await client.actor("kuantum/property-signal").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "targets": [] }

# Run the Actor and wait for it to finish
run = client.actor("kuantum/property-signal").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "targets": []
}' |
apify call kuantum/property-signal --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,kuantum/property-signal"
        }
    }
}

```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/c4cf4w7ECotwvpKka/builds/zEZnSSzyVQtDKRLi4/openapi.json