Pricing & Rate Limits

Transparent, COGS-aligned call weights. Most endpoints cost 1 call — premium endpoints with real licensing costs use weights of 2, 5, or 10. The API uses straightforward call-based billing, not credit tokens.

1–10

calls per request, by endpoint

4 weights

1 · 2 · 5 · 10 calls

No credit tokens

API billing is per-call, not credits

Cost per API call by plan

Divide your monthly price by your call allowance — that's your base per-call cost. Premium endpoints use weighted billing (see call weights below).

Plan	Monthly	Calls/mo	Cost/call	Rate limit
Free	Free	100	—	2 req/s
Starter	£49/mo	2,000	2.45p	5 req/s
Growth Popular	£149/mo	10,000	1.49p	10 req/s
Pro	£349/mo	50,000	0.70p	20 req/s
Scale	£699/mo	250,000	0.28p	40 req/s

Call weights by endpoint

Address endpoints use weighted billing that reflects their real licensing costs (Royal Mail PAF, Ordnance Survey). Most other endpoints cost 1 call:

2 calls

GET /api/address/find

Address autocomplete — search by text, returns up to 8 suggestions with UPRN. Lightweight typeahead for search boxes. COGS: ES query + search licensing ~0.5p.

Docs →

2 calls

GET /api/address/postcode/{postcode}

All properties at a postcode — returns UPRNs and addresses. Full UK coverage. COGS: ES query + licensing ~0.5p.

Docs →

5 calls

GET /api/address/retrieve/{uprn}

Full enriched address for a UPRN — address lines, coordinates, property characteristics, EPC data. COGS: Royal Mail PAF + OS licensing, 1.5–2.5p per request.

Docs →

10 calls

GET /api/v1/comparables/{uprn}

AI-ranked comparable sales within radius. COGS: OpenAI API + PostGIS spatial query, 2–5p. Competitors charge 50p+ per request.

Docs →

5 calls

GET /api/v1/solar-assessment/{uprn}

Solar panel suitability assessment. COGS: external MCS API, 1–2p per request.

Docs →

1 call

Everything else

Property, EPC, council tax, sold prices, flood risk, radon, crime, deprivation, demographics, schools, broadband, listings, planning, boundaries, noise, coal, landfill, invasive plants — all own data, all 1 call.

Typical find-then-retrieve workflow: Use find or postcode to get a UPRN (2 calls), then retrieve for the full enriched property record (5 calls). 7 calls total to go from a user typing an address to a fully populated property form. Compare that to competitors who charge 5–15 credits for the same workflow. Every response includes an X-Call-Weight header.

How our pricing compares

Some APIs use a credit system where different endpoints cost different numbers of credits per request. That makes it hard to predict costs. Here's a direct comparison for common workflows:

Workflow	Credit-based API (entry plan, ~£28/mo)	Homedata (Starter, £49/mo)
Address/UPRN lookup	14p/call (10 credits)	2.45p/call (Starter)
Property data (EPC, type, classification)	1.4p/call	2.45p/call (Starter)
1,000 address lookups/month	£140+ (needs £96/mo plan)	£24.50 (Starter, 2.45p/call)
Planning applications search	1.4p per 10 results	0.70p/call (Pro, £349/mo)
Full property workflow (address + data + EPC + 7 risks)	13–15 credits = 18–21p on entry plan	10 calls = 24.5p on Starter
Calls per £149/month (Growth)	~7,000 credits (variable real value)	10,000 calls (weighted billing)

Note: Competitor figures are illustrative based on publicly documented credit costs. Credit-based pricing means real cost per endpoint can vary — always check the individual endpoint docs page for their current credit cost. Our pricing uses transparent call weighting: most endpoints cost 1 call, premium endpoints cost more based on their real infrastructure costs. Every response includes an X-Call-Weight header.

Rate limits

Rate limits are per API key, per second. Exceeding the limit returns HTTP 429 — your request is not queued, retry with backoff.

Plan	Requests/second	Requests/minute
Free	2 req/s	120/min
Starter	5 req/s	300/min
Growth	10 req/s	600/min
Pro	20 req/s	1200/min
Scale	40 req/s	2400/min

Retry strategy: On a 429, wait for the Retry-After header (in seconds) before retrying. For batch jobs, add a small delay between requests — e.g. time.sleep(0.1) on Growth (10/s limit) gives you comfortable headroom.

Monthly quota

Your call quota resets on the first day of each billing month. Usage is tracked in real-time — check your current usage in the Developer Dashboard.

Most endpoints cost 1 call. Premium endpoints use transparent call weights: address find/postcode (2), address retrieve (5), comparables (10), solar (5). Every response includes an X-Call-Weight header.

Call weights reflect real infrastructure costs — Royal Mail PAF licensing, OpenAI API, external MCS data. The API uses transparent call-based billing, not credit tokens.

Quota overages don't result in charges — requests above your limit return HTTP 429 until your quota resets.

Upgrade anytime in the Billing dashboard — your quota increases immediately.

Explore credits — a separate system

Explore is a browser-based property intelligence dashboard — not part of the API. It uses its own credit system, completely separate from your API call quota.

API calls ≠ Explore credits. Using the API does not consume Explore credits, and using Explore does not consume API calls. They are billed and tracked independently.

	API	Explore
What it is	REST API for programmatic access	Browser dashboard for manual research
Billing unit	Weighted API calls (monthly subscription)	Credits (one-time purchase packs)
Free tier	100 calls/month	£10 of free credits on signup (10 address reveals or 50 event reveals)
Pricing	£49–£699/month subscription	£10–£300 one-time credit packs
Costs	1–10 calls per request	£0.20 per event reveal · £1 per address reveal

Explore credit packs are purchased separately from API subscriptions. See Explore for details on credit costs and reveal types.

Ready to start?

Free tier — 100 calls/month, no credit card. Upgrade when you need more.

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