Introducing the REI Lense API: Rental Analysis for Your Own Product

The engine behind REI Lense is now an API

For years, REI Lense has helped investors size up a rental in seconds — type an address, and get back estimated rent, cash flow, cap rate, cash-on-cash return, and comparables. Today we're making that same analysis engine available to developers as a public API.

If you build software for real estate investors, lenders, proptech products, or internal underwriting workflows, you can now bring instant rental analysis straight into your own app — no scraping, no spreadsheets, no stitching together half a dozen data sources.

What you can do with it

The API takes a single input and returns a full analysis. Send either a property address (or a supported listing URL) or GPS coordinates written as latitude,longitude, and you get back:

• Estimated market rent
• Monthly cash flow
• Cap rate
• Cash-on-cash return
• Rental comparables

It's a single GET request, and the response is clean JSON you can drop straight into your product.

Long-term rental analysis, today

At launch, the API supports long-term rental (LTR) analysis — the buy-and-hold numbers most investors reach for first.

Need mid-term (MTR) or short-term (STR) analysis? We already power those strategies inside REI Lense, and we're planning to bring them to the API as well. If MTR or STR data matters for what you're building, get in touch — we'd love to hear about your use case and can prioritize access for you.

Get started

The REI Lense API is live on RapidAPI, with a free tier to try it out and paid plans as you grow. Explore the API on RapidAPI to browse the endpoint, grab a key, and make your first call.

Have questions, feedback, or a use case you don't see covered yet? Reach out — we're building this alongside the developers who use it.