Partner APIv1
Valuations and street data for every home in England and Wales, in one API.
Send a postcode, a property type and the bedrooms. Get back a low, middle and high figure, and the share of past sales at that price level that landed inside the range. Street analysis is live beside it, and Market Intelligence and area data follow on the same credentials, token and error format.
SandboxNo sign-up for your first call: the Quickstart includes a shared test credential.
- Coverage
- England and Wales only. Postcodes elsewhere return
422 outside-coverage. - Base URL
https://api.checkmystreet.co.uk/partners/v1- Auth
- OAuth 2.0 client credentials, 30 minute tokens
- Billing
- Prepaid credits, topped up by card
curl -X POST https://api.checkmystreet.co.uk/partners/v1/valuations \
-H "Authorization: Bearer $TOKEN" \
-H "Idempotency-Key: 5f2b8c1e-4a7d-4e0b-9c61-2d8f3a90b7e4" \
-H "Content-Type: application/json" \
-d '{ "postcode": "M1 1AE", "propertyType": "flat", "bedrooms": 2 }'{
"id": "val_01j9xk2q7m4t8v6r3c5b0n1a2d",
"reference": "case-10492",
"valuedAt": "2026-11-03T10:15:02Z",
"valuation": {
"estimate": 425000,
"range": { "low": 381000, "high": 472000, "coverage": 0.81 },
"currency": "GBP"
},
"location": { "sector": "M1 1", "localAuthority": "E08000003" },
"dataQuality": "full",
"model": { "version": "2026-09-28T15:05:18Z" },
"input": { "postcode": "M1 1AE", "propertyType": "flat", "bedrooms": 2,
"floorAreaSqm": 57, "floorAreaSource": "bedrooms" },
"charge": { "credits": 10, "balanceAfter": 2490 }
}Valuation: the smallest valid request, and its response
Products
Products and prices-
Valuation
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A low, middle and high figure, and the share of past sales at that price level that landed inside the range.
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Street analysis
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What surrounds a postcode: sold prices, crime, transport by distance, rents and yields, energy use and the local price index.
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Market Intelligence Coming next
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The analysis for a postcode: growth, volatility, price regimes, market timing, holding periods, seasonality, repeat-sale returns, rents and yields.
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Areas Coming next
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Area profile
A profile of one postcode sector, such as
M1 1. -
Similar areas
The postcode sectors most like a given sector.
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Valuation
A low, middle and high figure, and the share of past sales at that price level that landed inside the range.
In back-tests on 128,804 sales from May to July 2026, 81% of homes at this price level sold inside a range like this one. It describes the model across many sales, not the odds for this one property. The model accuracy page has the figures for every price level.
Every valuation carries it as valuation.range.coverage, next to the low and high figures.
Low£381,000
Estimate£425,000
High£472,000
81% of past sales at this price level landed inside a range like this
M1 1AE, a 2-bed flat.