TwentyCi
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.
TwentyCi publishes 9 APIs on the APIs.io network, including Address Match API, Agent Performance API, Authorisation API, and 6 more. Tagged areas include Real-Estate, United Kingdom, PropTech, Property Data, and Valuation.
TwentyCi’s developer surface includes authentication, code examples, documentation, API reference, getting-started guide, engineering blog, and 29 more developer resources.
Kin Score
APIs 9
Individual APIs this provider publishes, each with its own machine-readable definition.
TwentyCi Address Match API
- Partial Address Matching
TwentyCi Agent Performance API
- Agent Performance based on Sales Data - Agent Performance based on Rental Data
TwentyCi Authorisation API
Bearer-token issuance for TwentyAPI.
TwentyCi Categories API
- Obtain a List of Categories for a Property - Obtain a Specific Categories for a Property
TwentyCi Properties API
- Property Information by Pagination - Properties Information by UPRN - Properties Details by UPRN - Recent Property Sales in the Area - Similar properties for sale in the area ...
TwentyCi Schools API
- Nearby Schools by Postcode
TwentyCi This is Now | Retail Propensity To Buy Goods API
- Local Search - National Search
TwentyCi Trigger Information API
- Obtain a Specific Trigger - Get Properties by Trigger Type - Get no UPRN Properties by Trigger Type - Trigger History
TwentyCi UK Housing Market Metrics API
- New Instructions, SSTC's and PCD's for a Specific Timeframe
Scroll for all 9
Open Collections 2
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
TwentyAPI (TwentyCi) OAuth 2.0 Token API
OPEN COLLECTIONTwentyAPI (TwentyCi) v2
OPEN COLLECTIONSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Get Started 2
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 8
The organization behind the API
Scroll for all 8
Other 4
Properties that don't map to a standard resource type
Source (apis.yml)
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.