# TwentyCi

**Canonical:** https://apis.io/providers/twentyci/  
**Website:** https://www.twentyci.co.uk/  
**APIs profiled:** 9

TwentyCi is a United Kingdom residential property data and home-mover intelligence company. It aggregates roughly 31.5 million UK addresses and tens of billions of data points from hundreds of primary sources into the DOMUS property database, and sells that data to estate agents, lenders, insurers, conveyancers, house builders, retailers and media agencies through the TwentyCi, TwentyEA and TwentyConvey brands. In the UK value chain it sits on the data-supply side rather than the listing side - there is no UK MLS, listings are controlled by the Rightmove and Zoopla portals, and TwentyCi is one of the private aggregators that resells transaction, valuation and home-mover signal on top of that closed market. Its API posture is honest but commercial - TwentyAPI is a genuine RESTful v2 API at https://api.twentyci.co.uk/api/v2 with a live, publicly readable documentation portal covering roughly 57 documented operations across properties, AVM valuation, transaction triggers, agent performance, address matching, schools, housing market metrics and retail propensity - but every endpoint returns 401 without a TwentyCi-issued OAuth 2.0 bearer token, there is no self-serve signup, no published pricing, and the specification download TwentyCi advertises at https://api.twentyci.co.uk/docs/v2/spec.json returns HTTP 404. Access is sales-led and partner-only. RESO is entirely absent - the UK has no MLS or RESO regime and TwentyCi identifies property by UPRN, the Ordnance Survey/GeoPlace Unique Property Reference Number, rather than by any RESO Universal Property Identifier.

## Kin Score — 32.0 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 32.0).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 14.1 |
| Governance | 45.5 |
| Contract Governance | 45.5 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 54.2 |
| Commercial Clarity | 18.4 |
| Access Clarity | 18.4 |

## Agent readiness — 33.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | partial |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (9)

- **TwentyAPI OAuth Token API** — The single documented authentication endpoint for TwentyAPI. Exchanges a TwentyCi-issued client_id, client_secret, username and password for a bearer access token and refresh to...
- **TwentyAPI Properties API** — The core DOMUS property surface of TwentyAPI. Retrieves property information and detail by UPRN, recent sales and comparable properties for sale in the area, average property va...
- **TwentyAPI Agent Performance API** — Estate-agent and letting-agent benchmarking built on TwentyCi sales and rental data. Ranks brands by SSTC, new instructions, exchange, PIPA (percentage of initial price achieved...
- **TwentyAPI Trigger Information API** — Home-mover event triggers - the transaction-lifecycle signals TwentyCi is built on. Retrieves a specific trigger, lists properties by trigger type (including properties with no ...
- **TwentyAPI Categories API** — Lists the attribute categories available for a property and returns a specific category, providing the vocabulary that the Properties API's attribute endpoints are organised aro...
- **TwentyAPI Address Match API** — Partial address matching. Submits a fragmentary or unstructured UK address to a match-address process and resolves it against TwentyCi's addressing layer, the capability markete...
- **TwentyAPI Schools API** — Returns nearby schools for a given UK postcode, one of the neighbourhood-context datasets TwentyCi layers onto a property record.
- **TwentyAPI UK Housing Market Metrics API** — Aggregate UK housing market metrics for a specified timeframe - new instructions, SSTCs (sold subject to contract) and PCDs (predicted to complete date) - the market-level view ...
- **TwentyAPI This is Now API** — "This is Now" retail propensity to buy goods. Local and national search endpoints returning consumer propensity signal derived from home-mover events, aimed at retailers and med...

## MCP servers (1)

- **TwentyCi MCP Server**

## Agentic access (1)

- **Twentyci Agentic Access** — 58 operations · 6 acting

## Security (2)

- **Twentyci Authentication** — oauth2 · 1 scheme
- **Twentyci Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Real-Estate, United Kingdom, PropTech, Property Data, Valuation, AVM, Rentals, Address Data, Conveyancing, Homemover Data, Agent Performance, Data as a Service

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/twentyci/). Scores are computed from the provider's own public artifacts under a published rubric.