What Is an Investment Analysis API, and Why Every PropTech Needs One
Single-family rental cap rates climbed to 7.3% by the end of 2025, nearly two full percentage points higher than they were back in 2021. That’s the kind of shift that quietly breaks every underwriting model still running on last year’s comps.
If your platform calculates cap rate, cash-on-cash return, or occupancy by pulling numbers from a static spreadsheet someone built during onboarding, those numbers are already stale. Real estate markets move every month. Your data should too.
That’s the entire reason a real estate investment analysis API exists. Instead of your team scraping listings, building rent comp models, and recalculating returns by hand every time a market shifts, you make one API call and get back the numbers investors actually care about, refreshed daily.
We built Mashvisor’s Investment Analysis endpoint because we kept seeing the same pattern. Investors didn’t just want a list of properties for sale. They wanted to know what each individual property would actually return as a rental. PropTech teams asked for the same thing, just programmatically.
If you’re evaluating options for your platform’s data layer, our API overview is a good place to see how the whole system fits together before you dig into this specific endpoint.
Key Takeaways
- An investment analysis API delivers calculated rental return metrics (cap rate, cash-on-cash return, occupancy, rental income) for a property or market through a single programmatic request, instead of requiring manual research.
- Mashvisor’s Investment Analysis endpoint returns these metrics for both short-term rental and long-term rental strategies in the same response, so platforms can compare both without combining multiple data sources.
- The endpoint family includes city-level investment performance, property-level breakdowns, map-ready property markers, and comparable listings for both Airbnb and traditional rentals.
- PropTech teams use this data to power underwriting tools, DSCR loan platforms, portfolio dashboards, and marketplace listings ranked by return potential.
- Compared to STR-focused providers like AirDNA or Rabbu, Mashvisor’s investment data covers both rental strategies in one schema, which matters for any platform serving investors who are deciding between the two
What Is an Investment Analysis API?
An investment analysis API is a data endpoint that takes a property or location as input and returns the financial metrics an investor would normally calculate themselves. Think cap rate, cash-on-cash return, monthly rental income, and occupancy rate, all delivered as structured data your application can use immediately.
The difference between this and a basic property data API is the math. A property data API tells you a home has three bedrooms, two bathrooms, and last sold for $340,000. An investment analysis API takes that same property and tells you what it would rent for, what your return would look like, and how that compares to similar properties nearby.
For developers, this matters because building that math yourself is harder than it looks. You need rental comps, you need to estimate operating expenses, you need historical performance data to avoid garbage-in-garbage-out estimates, and you need to keep all of it updated as markets shift. An API that already does this lets you skip straight to building the feature your users actually want.
The Core Metrics Every Investment Analysis API Should Return
Not all “investment data” is created equal. Here’s what to look for, and what Mashvisor’s Investment Analysis endpoint returns for both Airbnb and traditional rental strategies.
Cap Rate
Cap rate: the property’s net operating income divided by its current value, expressed as a percentage.
It’s the fastest way to compare two properties of different price points on a level playing field. Mashvisor returns separate cap rate figures for Airbnb (airbnb_cap_rate) and traditional rental (traditional_cap_rate) for the same property, so your users can see both strategies side by side.
Cash-on-Cash Return
Cash-on-cash return (CoC): annual pre-tax cash flow divided by the total cash actually invested, including down payment and closing costs.
This is the number investors with a mortgage care about more than cap rate, since it accounts for financing costs that cap rate ignores. Again, Mashvisor breaks this out for both rental strategies (airbnb_coc and traditional_coc).
Occupancy Rate
Occupancy rate: the percentage of available nights or days a property is actually rented.
For short-term rentals, this is calculated from real booking data across comparable listings. For long-term rentals, it reflects how quickly similar units in the area get leased and stay occupied. Occupancy is one of the most volatile inputs in any return calculation, which is exactly why it needs to come from live data rather than a one-time estimate.
Monthly Rental Income
Monthly rental income: the projected monthly revenue for a property under each strategy, broken down by bedroom count (studio through 4+ bedrooms in Mashvisor’s response).
This is the input every other metric is built on, so getting it from real comparable listings rather than a generic formula makes a meaningful difference in accuracy.
Need rent estimates as a standalone feed rather than bundled into a full investment analysis? That’s exactly what the Rental Rates endpoint is built for, and it pairs naturally with the Investment Analysis data described here.
Inside Mashvisor’s Investment Analysis Endpoint
The Investment Analysis endpoint isn’t a single call, it’s a family of related endpoints that cover different levels of detail:
- Get Investment Performance returns the key calculated metrics for a specific property or for a city-wide median, including median price, square footage, the count of investment properties available, and both Airbnb and traditional figures for cap rate, CoC, occupancy, and rental income.
- Get Investment Breakdown digs one level deeper into the components behind those headline numbers, useful for platforms that want to show users the “why” behind a return figure rather than just the final percentage.
- Get Property Marker returns map-ready data points, which is what powers heatmap-style views where users can visually scan a city for high-return pockets rather than scrolling through a list.
- Get Airbnb Comparable Listings and Get Traditional Comparable Listings return the actual comp sets behind the numbers, so your platform can show users “here’s how we got this estimate” with real comparable properties.
The detail that tends to matter most for PropTech teams is that every property-level response includes both Airbnb and traditional figures together. You’re not making two separate calls to two separate providers and trying to reconcile different methodologies. It’s one schema, one update cycle, both strategies.
Building It Yourself vs. Using an Investment Analysis API
Some teams start by building their own return calculations in-house, usually because it feels like a small lift at first. But, it rarely stays small. Here’s how the two approaches compare in practice.
| Building It In-House | Mashvisor Investment Analysis API | |
| Data sourcing | You aggregate MLS feeds, STR comps, and rental listings from multiple vendors | Pre-aggregated from MLS, Airbnb, and traditional rental sources |
| Update frequency | Depends on your refresh pipeline, often weekly or monthly at best | Updated on a daily basis |
| STR + LTR coverage | Usually requires combining two separate data providers | Both strategies returned in one response |
| Time to launch | Weeks to months for a basic version, longer to make it reliable | Days, since the calculations are already done |
| Ongoing maintenance | Your team owns data quality, methodology changes, and outages | Maintained as part of the API |
| Cost structure | Engineering time plus multiple data licenses | Single API subscription, usage-based pricing |
If you want a closer look at how usage-based pricing actually works for teams integrating this kind of data, we broke that down in detail in our API pricing guide.
How PropTech Platforms Put This Data to Work
The teams integrating real estate investment analysis data fall into a few common categories, and each uses the endpoint family slightly differently.
- DSCR lenders use the cash-on-cash return and rental income figures as inputs to debt service coverage ratio calculations, automating a step that loan officers used to do manually for every application.
- Portfolio management platforms pull investment performance data on a recurring basis to show owners how their existing properties compare to current market returns, flagging when a property’s numbers have drifted from where they started.
- Marketplace and listing platforms use Get Property Marker and the comparable listings endpoints to let users sort and filter properties by projected return rather than just price, turning a standard listing site into an investment tool.
- Arbitrage and strategy calculators lean directly on the side-by-side Airbnb versus traditional figures to help users decide which rental strategy makes more sense for a specific property, something we cover in depth in our STR vs. LTR comparison.
If you want to start analyzing what this looks like for a specific housing market before committing to an integration, you can explore the data yourself here using the same underlying numbers the API returns.
One thing to flag here is where this fits relative to other data providers. AirDNA and Rabbu are both strong sources for short-term rental performance data specifically, and plenty of platforms successfully use them for that purpose. Where Mashvisor’s Investment Analysis endpoint differs is in returning both short-term and long-term rental metrics from the same property record, which matters most for any platform where users are actively comparing the two strategies.
Bottom Line
Cap rates don’t sit still, and neither should the data behind your rental property investment tools. Whether you’re building a DSCR underwriting flow, a portfolio dashboard, or a marketplace that ranks listings by return potential, the question is the same: are you working with numbers from this week, or from whenever someone last updated a spreadsheet?
An investment analysis API closes that gap by returning the calculations investors actually need, for both short-term and long-term strategies, refreshed daily. If you’re ready to see what this looks like with your own use case, get in touch about API access and we’ll walk through it together.
FAQ
What is an investment analysis API used for?
An investment analysis API is used to programmatically retrieve calculated rental return metrics, such as cap rate, cash-on-cash return, occupancy rate, and projected rental income, for a property or housing market, so developers don’t have to build these calculations from raw data themselves.
What metrics does Mashvisor’s Investment Analysis API return?
Mashvisor’s Investment Analysis endpoint returns cap rate, cash-on-cash return, occupancy rate, and monthly rental income, calculated separately for both Airbnb (short-term) and traditional (long-term) rental strategies for the same property or market.
How is cap rate calculated through the API compared to doing it manually?
The calculation itself, net operating income divided by property value, is the same. The difference is that the API handles the underlying inputs, including rental comps, expense estimates, and current property values, and refreshes them daily, rather than requiring manual research each time.
Can the API show both short-term and long-term rental returns for the same property?
Yes. Mashvisor’s Investment Analysis endpoint returns both Airbnb and traditional rental figures, including separate cap rate and cash-on-cash return values for each strategy, within the same response.
How does Mashvisor’s Investment Analysis API compare to AirDNA or Rabbu?
Mashvisor, AirDNA, and Rabbu each provide strong short-term rental performance data. Mashvisor’s Investment Analysis endpoint additionally returns long-term rental metrics in the same schema, which is useful for platforms where users compare both rental strategies.
How often is the investment data updated?
Mashvisor’s data, including the metrics returned by the Investment Analysis endpoint, is updated on a daily basis, reflecting current MLS listings and rental market activity rather than static historical snapshots.