n8n Zillow Deal Monitor by ZIP: API, Sheets & Slack Alerts

Track ZIP-level real estate deals automatically with n8n

The n8n Zillow Deal Monitor by ZIP workflow runs daily to pull for-sale listings from the APIllow API, calculates $/sqft vs. each ZIP’s median, logs new deals to Google Sheets (no duplicates), and sends Slack alerts for pricing that hits your configured threshold.

What this workflow does

• Schedules daily at 8:00am to keep your deal monitoring current.
• Submits a ZIP-code for-sale property search to the APIllow API, receiving an asynchronous job ID.
• Polls results every 10 seconds until the job is marked complete, retrying API calls and posting an error alert to Slack if a call fails after retries.
• Flattens returned listings and calculates each property’s price per square foot.
• Computes the median $/sqft per ZIP from the same batch of returned listings.
• Reads existing rows in the Google Sheets “Deals” worksheet and filters out duplicates by removing listings whose zpid is already tracked.
• Appends only new listings to Google Sheets, including $/sqft, the `ZIP median`, and the discount %.
• Posts a Slack deal alert when a newly logged listing is priced at or below your ZIP median threshold.

Use cases

• Real estate operators monitoring multiple ZIP codes for undervalued properties.
• SaaS teams or automation engineers building an internal deal intelligence pipeline with audit-friendly Google Sheets logs.
• Teams who want immediate Slack notifications whenever a new listing qualifies as a deal.

Technical details

• APIllow integration using header auth with x-api-key.
• Google Sheets OAuth with a spreadsheet containing a “Deals” sheet and a zpid column.
• Slack messages for deal alerts and error alerts (configurable channels).
• Uses n8n nodes/tools including: if, set, code, wait, slack, and sticky note.