ZipMarketData — Real Estate Data API for Any US ZIP Code

How it works

One key. Five minutes.

Subscribe on RapidAPI, add two headers, get data. That's the entire integration.

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Add two request 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 structured data back

Pass a ZIP or city, receive clean JSON. Every response includes a data_source field — you always know the provenance.

GET /market-stats
?zip_code=90210
→ {"median_sale_price":
1250000, ...}

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.

Who uses this

Built for builders, investors & analysts.

🏘️

Proptech Apps

Add live market context to relocation tools, mortgage calculators, and property search. No scraping, no maintenance.

/market-stats · /price-history

📊

Investment Screening

Screen thousands of ZIPs for cash flow, cap rate, and rental yield in seconds. Build your own deal analyser.

/property-estimate · /rental-yield

🤖

AI Agents & Copilots

Give your LLM structured market context. Clean JSON with labelled fields is ideal for tool use.

All endpoints

📈

Market Dashboards

Build heat maps, trend charts, affordability monitors. 12 months of history, daily updates.

/price-history · /affordability

🏠

Relocation Tools

Compare housing costs across metros. Affordability index + personalised income scoring in one call.

/affordability · /market-stats

🔬

Research & Analysis

Bulk data for academic research, journalism, and market analysis. Government-sourced, clearly cited.

/health · All endpoints

Property data for
any US ZIP.
One call.

One key. Five minutes.

Five endpoints. Click to expand.

Real data. Always labelled.

Redfin Public Data

HUD Fair Market Rents

Census Bureau ACS

Modelled Estimate

Built for builders, investors & analysts.

Start free. Scale when ready.

Real estate data,
ready in minutes.

Property data forany US ZIP.One call.

One key. Five minutes.

Five endpoints. Click to expand.

Real data. Always labelled.

Redfin Public Data

HUD Fair Market Rents

Census Bureau ACS

Modelled Estimate

Built for builders, investors & analysts.

Start free. Scale when ready.

Real estate data,ready in minutes.

Property data for
any US ZIP.
One call.

Real estate data,
ready in minutes.