ZipMarketData — Cash Flow & Rental Yield for Any US ZIP Code

How it works

Two ways to use it.

Use the no-code dashboard to research deals, or integrate the API directly into your own tools.

For investors No-code dashboard — research any ZIP in seconds

Create an account in under a minute. No credit card. You get 15 free searches per day to evaluate markets.

zipmarketdata.com/dashboard
→ Sign up free
→ Instant access

Enter any ZIP code

Type in a ZIP or click a quick-pick market. See median price, rental yield, cash flow estimate, and market temperature immediately.

ZIP: 78701 (Austin TX)
→ Median price: $585k
→ Gross yield: 5.04%
→ Market: Buyer's

Analyse the deal

Pro plan adds expense breakdown, financing scenarios, 5-year wealth projection, and multi-bedroom comparison — everything to decide yes or no.

Cash flow: -$240/mo
Cap rate: 3.65%
5yr equity: +$148k
Break-even rent: $3,210

Start free — 15 searches/day → Log in

For developers REST API — integrate into your own app

Get a free API key

Subscribe on RapidAPI — free tier is instant, no credit card. 50 calls/month to build and test.

rapidapi.com → search
"Real Estate Market Data"
→ Subscribe Free

Add two headers

Your RapidAPI key and host in every request. No OAuth, no token refresh, no config files.

X-RapidAPI-Key: your-key
X-RapidAPI-Host:
real-estate-market-data
.p.rapidapi.com

Get clean JSON back

Pass a ZIP or city name, receive structured data. Every response includes a data_source field so you always know the provenance.

GET /market-stats
?zip_code=78701
→ {"median_sale_price":
585000, ...}

Get free API key → See all endpoints ↓

API Reference

Five endpoints. Click to expand.

All return JSON. All include a data_source field on every response.

GET

/market-stats

Market Stats by ZIP Code

Median price, DOM, inventory, price changes, market temp — 28k+ ZIPs

zip_coderedfin_mls

▾

Parameters

Name	Type		Description
zip_code	string	required	5-digit US ZIP — e.g. 90210

Example Response

json

{ "zip_code": "78701", "data_date": "2025-03", "median_sale_price": 585000, "median_days_on_market": 67, "active_listings": 284, "yoy_price_change": -0.149, "market_temperature": "Buyer's Market", "inventory_months": 4.2, "data_source": "redfin_mls" }

median_sale_price

Median final sale price this month

yoy_price_change

YoY as decimal (−0.149 = −14.9%)

market_temperature

Hot / Warm / Balanced / Cool / Buyer's Market

inventory_months

Months of supply at current pace

list_to_sale_ratio

Sale ÷ list. Above 1.0 = over asking

data_source

redfin_mls or estimated

GET

/price-history

12-Month Price History

Monthly median prices for any US city — sales count and DOM per month

citystate

▾

Parameters

Name	Type		Description
city	string	required	City name — e.g. Austin
state	string	required	2-letter state — e.g. TX
property_type	string	optional	all · single_family · condo · townhouse

Example Response

json

{ "city": "Austin", "state": "TX", "appreciation_12m_pct": -8.4, "peak_month": "2024-05", "data_source": "redfin_mls", "monthly_data": [ { "month": "2024-04", "median_sale_price": 549000, "sales_count": 312, "days_on_market": 58 } // … 11 more months ] }

GET

/rental-yield

Rental Yield by ZIP

Gross yield from HUD Fair Market Rent + Redfin prices — 30k+ ZIPs, by bedroom count

zip_codehud_fmr

▾

Parameters

Name	Type		Description
zip_code	string	required	5-digit US ZIP — e.g. 78701
bedrooms	integer	optional	1–5 bedrooms. Default: 2

Example Response

json

{ "zip_code": "78701", "bedrooms": 2, "median_sale_price": 585000, "estimated_monthly_rent": 2458, "gross_yield_pct": 5.04, "yield_rating": "Average", "hud_fmr_year": 2025, "data_source": "hud_fmr" }

GET

/affordability

Affordability Index by Metro

Census income + prices = affordability score. Pass income for a personalised result

metrocensus_acs

▾

Parameters

Name	Type		Description
metro	string	required	Metro name — e.g. Austin, Miami
income	integer	optional	Household income for personalised score

Example Response

json

{ "metro": "Austin", "affordability_index": 72.4, "interpretation": "Stretched", "median_household_income": 81400, "median_home_price": 585000, "price_to_income_ratio": 7.2, "years_to_save_down_payment": 9.6, "data_source": "census_acs" }

GET

/property-estimate

Property Value Estimate & Investment Analysis

AVM + cash flow, cap rate, CoC return, buy-vs-rent in one call

NEWzip_code

▾

Parameters

Name	Type		Description
zip_code	string	required	5-digit US ZIP
bedrooms	integer	optional	1–5 bedrooms. Default: 3
bathrooms	number	optional	e.g. 1.5, 2, 2.5. Default: 2
sqft	integer	optional	Square footage — narrows estimate range

Example Response

json

{ "estimated_value": 612232, "value_range_low": 538764, "value_range_high": 685699, "confidence": "medium", "gross_yield_pct": 6.08, "data_source": "redfin_mls", "investment_metrics": { "monthly_cash_flow": -1397, "cap_rate_pct": 3.65, "cash_on_cash_return_pct": -13.69, "investment_rating": "Negative Cash Flow ⚠️" }, "buy_vs_rent": { "monthly_premium_to_own": 1397 } }

confidence

low / low-medium / medium

cap_rate_pct

NOI ÷ value. No-debt return.

cash_on_cash_return_pct

Annual CF ÷ down payment

investment_rating

Excellent / Good / Average / Negative

monthly_premium_to_own

Extra cost vs renting monthly

data_source

redfin_mls or estimated_avm

GET

/health

API Health & Data Coverage

Coverage counts and pipeline run status. No API key required.

no key needed

▾

Example Response

json

{ "status": "ok", "api_version": "1.1.0", "data_coverage": { "zip_codes_with_market_data": 27841, "cities_with_price_history": 20879, "zip_codes_with_rental_data": 30442, "metros_with_income_data": 938 } }

Error codes

Code	Meaning
400	Bad request — invalid ZIP or missing param
403	Missing or invalid RapidAPI key
429	Rate limit exceeded — upgrade plan
500	Server error — check /health

data_source values

Value	Meaning
redfin_mls	Redfin public market data
hud_fmr	HUD Fair Market Rents (gov)
census_acs	Census Bureau ACS income
estimated_avm	Modelled estimate — clearly labelled

Data Sources

Real data. Always labelled.

Every response includes a data_source field — you always know whether you're seeing MLS data, government data, or a model estimate.

redfin_mls

Redfin Public Data

ZIP and city-level stats from Redfin's public download datasets. 28k+ ZIPs, 3k+ cities. Updated daily.

hud_fmr

HUD Fair Market Rents

US government rental data for 30,000+ ZIPs. Studio through 4BR monthly rents. Public domain.

census_acs

Census Bureau ACS

Median household income for 900+ metros from the American Community Survey. Updated annually.

estimated_avm

Modelled Estimate

Deterministic model for ZIPs not yet in the database. Always clearly labelled, never silently substituted.

What people use it for

Research markets.
Analyse deals. Build tools.

🏠

Vetting rental properties

Before making an offer, look up the ZIP. See the median price trend, estimated rent, gross yield, and whether the market is heating up or cooling down. Takes 30 seconds.

Dashboard · ZIP Lookup

📊

Comparing markets side by side

Torn between Austin and Nashville? Run both ZIPs and compare cap rate, cash flow, yield rating, and days on market — in a single view.

Dashboard · Compare ZIPs (Business)

💰

Running the numbers on a deal

Expense breakdown by line item, 4 financing scenarios (10–25% down), and a 5-year wealth projection. See whether a deal works before you talk to an agent.

Dashboard · Pro plan

📈

Spotting the right time to buy

12 months of price history with seasonality analysis. See which months historically have the lowest prices — and the fewest competing buyers.

Dashboard · Price History

🏘️

Building proptech products

Add live market data to relocation tools, mortgage calculators, and property search. Clean JSON from government sources — no scraping, no maintenance.

API · /market-stats · /price-history

🤖

AI real estate agents

Give your LLM structured market context for any ZIP in the US. Clean JSON with labelled data sources is ideal for tool-use and RAG pipelines.

API · All endpoints

Pricing

Start free. No credit card.

Two products, one data set. Use the dashboard if you're an investor. Use the API if you're a developer.

Dashboard — for investors (no code needed)

Free

forever

15 searches / day

ZIP Lookup, Price History

Affordability Calculator

Start free →

Is this ZIP worth
investing in? Find out
in seconds.

Two ways to use it.

Five endpoints. Click to expand.

Real data. Always labelled.

Redfin Public Data

HUD Fair Market Rents

Census Bureau ACS

Modelled Estimate

Research markets.
Analyse deals. Build tools.

Start free. No credit card.

Stop guessing.
Know the numbers.

Is this ZIP worthinvesting in? Find outin seconds.

Two ways to use it.

Five endpoints. Click to expand.

Real data. Always labelled.

Redfin Public Data

HUD Fair Market Rents

Census Bureau ACS

Modelled Estimate

Research markets.Analyse deals. Build tools.

Start free. No credit card.

Stop guessing.Know the numbers.

Is this ZIP worth
investing in? Find out
in seconds.

Research markets.
Analyse deals. Build tools.

Stop guessing.
Know the numbers.