OnTheMarket UK Property Data API · Live

Pull live OnTheMarket data
in the time it takes
to read this sentence.

Property listings with freshness tags, direct agent-sourced detail, commercial and land/new-homes categories, and sold price history across the UK housing market — structured and delivered as clean JSON or CSV.

See a Live Response
Freshness New Today / New This Week
<3s avg. response time
99.9% uptime SLA
50M+ requests / month served
GET /v1/onthemarket/properties
LIVE
// streaming a live listing pull...
Trusted by global businesses pulling OnTheMarket data at scale
PropInsights LandBridge DwellData TrendWatch Realty EstateMetrics Prospectrix
500+
GLOBAL CLIENTS SERVED
300+
PROJECTS DELIVERED
50M+
MONTHLY API CALLS
24/7
DEDICATED SUPPORT
Why Choose Our OnTheMarket API

OnTheMarket was built by agents, around agents — and its data reflects that.

Founded as an agent-backed alternative to the bigger UK portals, OnTheMarket leans on listing-freshness signals ("New Today", "New This Week") and direct agent-sourced detail, alongside dedicated commercial property and land/new-homes sections. Our infrastructure resolves freshness tags, agent-branch sourcing, and category-specific fields explicitly rather than a single generic listing type.

01

Zero blocking, zero maintenance

We run rotating residential IPs, headless rendering, and CAPTCHA-solving behind every request. When OnTheMarket changes its layout, we patch our parsers — your integration never breaks.

02

Listing freshness extraction

Every property response returns the freshness tag (New Today, New This Week, or older) as it appears on the listing.

03

Commercial & land category resolution

We resolve commercial property listings and land/new-homes categories with their own category-specific fields.

04

Built for scale from day one

From a 100-listing test batch to full UK-wide monitoring, the same endpoint scales with you.

OnTheMarket API Features

Everything you need to keep OnTheMarket data flowing.

⚡

Real-time extraction

Trigger an on-demand pull for any listing, postcode, or area and get a fresh response — not a stale cache.

🧩

Custom field selection

Request only the fields you need — freshness tag, agent branch, category — to cut payload size and parsing time.

🏷️

Freshness tag resolution

Pull the exact freshness label (New Today, New This Week) shown on a listing.

🏢

Commercial listing extraction

Return office, retail, and industrial commercial property listings with category-specific fields.

🏗️

Land & new homes resolution

Resolve plot size and developer detail for land and new-homes listings.

📊

Sold price history tracking

Store and query sold price history per address to power comparable-sales analysis.

What Data Can You Access?

Every field a listing shows — freshness and category detail included.

CoreProperty address & IDBed/bath count, property type, postcode
PricingAsking priceGuide price or offers-over price
FreshnessListing freshness tagNew Today, New This Week, or older
AgentListing branch & agent detailSourcing agent branch and contact
CommercialCommercial property typeOffice, retail, industrial classification
CommercialFloor area & lease termsSq ft area and lease length where applicable
LandPlot sizeLand parcel size for land listings
New HomesDeveloper & phase detailDeveloper name and build phase
HistorySold price historyPast sale prices for the address/area
EnergyEPC ratingEnergy Performance Certificate band
TenureFreehold / leasehold statusTenure type where disclosed
MediaFloorplan & photosImage gallery and floorplan link
Supported OnTheMarket Categories

Residential, commercial, land, and new homes — one integration.

Switch the category parameter to pull listings from a specific transaction type with the same consistent response shape.

🏠

Residential

For sale and to rent residential listings.

🏢

Commercial

Office, retail, and industrial property listings.

🏞️

Land

Land parcels and development plots.

🏗️

New Homes

Developer new-build listings by phase.

CoverageUK-wideCoverage across England, Scotland, Wales & NI
FreshnessFreshness-taggedListing recency resolved per property
FreshnessReal-timeListing and price data checked on every request
OnTheMarket API Endpoints

A small set of endpoints that cover the whole listing lifecycle.

Method Endpoint Description Typical use
GET /v1/onthemarket/properties Residential listings by postcode & filters Listing & price monitoring
GET /v1/onthemarket/commercial Commercial property listings by category Commercial market research
GET /v1/onthemarket/land-new-homes Land and new-homes listings by developer/area Development pipeline tracking
GET /v1/onthemarket/sold-prices Sold price history by address/area Comparable sales analysis
GET /v1/onthemarket/agents Agent branch profile & listing count Agent network analysis
POST /v1/onthemarket/bulk Submit up to 10,000 listing IDs per batch job Portfolio-wide monitoring
Live API Response Example

This is exactly what comes back. No extra parsing needed.


        

    







    

        

            Popular OnTheMarket API Use Cases
            
Built for the teams that live and die by OnTheMarket data.

        

        

            

                
📈

                
Listing & price monitoring

                
Track live property listings and asking prices across UK regions.

            

            

                
🔍

                
UK housing market research

                
Analyze price trends and inventory composition across postcodes.

            

            

                
🏷️

                
Listing freshness analysis

                
Study how listing recency correlates with pricing and time-to-sell.

            

            

                
🏢

                
Commercial property research

                
Track office, retail, and industrial listing trends by region.

            

            

                
🏗️

                
Land & development pipeline tracking

                
Monitor land listings and new-homes developer activity by area.

            

            

                
💰

                
Sold-price comparables research

                
Pull sold price history to benchmark asking prices in an area.

            

            

                
🏆

                
Competitive benchmarking

                
Compare listing coverage and pricing against Rightmove and Zoopla.

            

            

                
🤖

                
ML training data

                
Generate labeled listing, freshness, and sold-price datasets for pricing models.

            

        

    







    

        

            How the OnTheMarket API Works
            
From API key to structured data in five steps.

        

        

            

            

                
1

                
Get your API key

                
Sign up and generate a key from your dashboard in under two minutes.

            

            

                
2

                
Choose an endpoint

                
Pick /properties, /commercial, /land-new-homes or /sold-prices depending on what you need.

            

            

                
3

                
Send the request

                
Call the endpoint with a postcode, area name, or listing ID.

            

            

                
4

                
We handle the hard part

                
Proxies, headless rendering, CAPTCHA-solving, and parsing all happen behind the scenes.

            

            

                
5

                
Receive structured data

                
Get clean JSON or CSV back in seconds, ready to drop into your pipeline.

            

        

    







    

        

            Developer-Friendly Integration
            
Built by people who read the docs too.

            
One consistent JSON schema across every category and every endpoint. No SDK lock-in — plain REST calls work from any language or platform.

            

                

                    
→

                    

                        
Predictable REST design

                        
Standard HTTP verbs, query params, and status codes — nothing proprietary to learn.

                    

                

                

                    
→

                    

                        
JSON, CSV, or webhook delivery

                        
Get results inline, as a downloadable file, or pushed to your endpoint when a batch job finishes.

                    

                

                

                    
→

                    

                        
Sandbox & test keys

                        
Free sandbox environment with sample listing IDs so you can build before you pay.

                    

                

                

                    
→

                    

                        
Postman collection & SDK snippets

                        
Import a ready-made collection or copy request snippets for Python, Node.js, and cURL.

                    

                

            

        

        

            

                
                Quickstart
            

            

                
                
                
            

            

        

    







    

        

            API Performance & Reliability
            
Numbers we publish because we track them daily.

        

        

            

                
99.9%

                
Uptime SLA

                

                    

                

            

            

                
<3s

                
Avg. response time

                

                    

                

            

            

                
99.3%

                
Successful extraction rate

                

                    

                

            

            

                
10K+

                
Concurrent requests supported

                

                    

                

            

        

    







    

        

            Security & Compliance
            
Compliant by design, not as an afterthought.

        

        

            

                
🔒

                
Encrypted in transit

                
All requests and responses travel over TLS 1.2+. API keys can be scoped and rotated anytime.

            

            

                
⚖️

                
UK GDPR & global alignment

                
Our extraction workflows are built around UK GDPR alongside EU data protection guidelines.

            

            

                
🌐

                
Public-data-only policy

                
We collect only publicly accessible listing data — never login-gated contact details or payment information.

            

        

        

            
                ✓ISO 9001:2015 Certified
            
            
                ✓ISO/IEC 27001:2013 Certified
            
            
                ✓IAF Multilateral Recognition
            
            
                ✓GDPR-aligned workflows
            
        

    







    

        

            API Documentation & Resources
            
Everything to go from key to production.

        

        

            

                Guide
                
Quickstart Guide

                
Get your first API response back in under five minutes.

                Read guide →
            

            

                Reference
                
Full API Reference

                
Every endpoint, parameter, and response field documented in detail.

                View reference →
            

            

                Tool
                
Postman Collection

                
Import ready-made requests for every OnTheMarket API endpoint.

                Download →
            

            

                Code
                
SDKs & Code Samples

                
Python, Node.js, PHP, and Ruby snippets for every use case.

                Browse samples →
            

        

    







    

        

            Frequently Asked Questions
            
Still deciding? Here's what most teams ask first.

        

        

            

                
                

                    
We collect only publicly accessible listing data using automated tools, following publicly available web-data guidelines. We recommend reviewing your own use case with legal counsel, especially for redistribution.

                

            

            

                
                

                    
Every request to /properties and /commercial triggers a live pull — you're not reading from a stale cache. Bulk jobs complete within minutes depending on batch size.

                

            

            

                
                

                    
Yes — every /properties response includes the freshness tag (New Today, New This Week, or older) exactly as shown on the listing.

                

            

            

                
                

                    
Yes — the /commercial endpoint returns office, retail, and industrial listings, and /land-new-homes returns land parcels and developer new-build listings with category-specific fields.

                

            

            

                
                

                    
Our infrastructure retries automatically across a rotating proxy pool. You're only billed for successfully returned responses.

                

            

            

                
                

                    
Yes, every account starts with a free sandbox key and sample credits so you can test all endpoints before committing to a plan.

                

            

        

    







    

        
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