Show your client the Land Registry number before the surveyor does

Down-valuations kill deals late. The Nestraq price check puts the HM Land Registry sold-price band next to any asking price — a one-line embed on your listing, calculator or client pages. Free, domain-locked, postcode-level only.

One line on your page

<script src="https://nestraq.com/partner/widget.js"
        data-key="nqp_YOUR_KEY"
        data-postcode="M20 4WX"
        data-asking-price="285000"
        data-type="terraced" data-beds="3"
        defer></script>

It renders the estimate band, where the asking price sits in it (under / fair / over), confidence, comparable count, stamp duty and the mandatory provenance line. Script embed, not an iframe — it inherits nothing from us and sends nothing about your visitor.

Or call the API directly

POST https://api.nestraq.com/v1/partner/price-check
Content-Type: application/json

{ "key": "nqp_YOUR_KEY", "postcode": "M20 4WX", "asking_price": 285000 }

→ { "estimate": 298000, "estimate_low": 271000, "estimate_high": 322000,
    "confidence": "medium", "comps_count": 14, "verdict": "under",
    "deal_pct": 4.4, "liquidity": "active",
    "sdlt": { "standard": 4250, "first_time_buyer": 0, "additional_property": 18500 },
    "attribution": "Contains HM Land Registry data …",
    "disclaimer": "Not a valuation for lending purposes. …" }

OpenAPI spec: nestraq-mcp ships a one-tool MCP wrapper so agent-side brokers can call it too.

What it will never return

No exact addresses, no comparables lists, no UPRNs — the response schema is postcode-level only, by design and by test. There is no end-buyer personal data in this API because it cannot exist in the schema.
No mortgage steering. The output is statistical information about a property price — it never recommends or compares mortgage products. Advice on your page is yours, under your own permissions.
Not a valuation for lending purposes — that disclaimer is hard-coded into every response and rendered by the widget.

How keys work

Domain-locked — like a Maps key, your key only works from your registered domain(s), so it is safe to ship in public HTML.
Free tier: 200 checks/day per key, cached at postcode level for 24h so repeated views of one listing cost one lookup.
Email-verified, self-serve — no sales call. Need more volume? [email protected].

Get your key

Data: HM Land Registry Price Paid Data + UK House Price Index, Open Government Licence v3.0. Keep the attribution line rendered — it's a licence condition. Full partner terms, including the derived-data resale ban.