Leeds Building Society
Leeds Building Society is the fifth-largest building society in the United Kingdom, a mutual owned by and run for the benefit of its members rather than shareholders. Founded in 1875 and headquartered in Leeds, West Yorkshire, it holds over GBP 31 billion in assets and serves more than 991,000 members, focusing on savings and residential mortgages (including shared-ownership and later-life lending) rather than current accounts. It is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the PRA. Because Leeds Building Society does not provide payment or current accounts, it is not one of the CMA9 mandated banks and is not an Account Servicing Payment Service Provider (ASPSP) under PSD2 / UK Open Banking; it participates in Open Banking as a data consumer (for example using Experian Boost and Account Information data to speed mortgage affordability decisions) rather than as an API provider. As of this review it publishes no public developer portal, no OBIE Open Data endpoint, and no OBIE Read/Write APIs. The OBIE standard specifications below are captured as shared-standard references, not as Leeds Building Society API contracts.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Leeds Building Society the way a machine reads it — 11 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Leeds Building Society scores 30.4/100 (thin), with a separate agent-readiness read of 15/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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title="Leeds Building Society on API Evangelist — API profile and Kin Score">
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title="Leeds Building Society on API Evangelist — API profile and Kin Score">
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alt="Leeds Building Society Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
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How we profile Leeds Building Society
Each block below is one kind of artifact we hold for Leeds Building Society. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 9
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
OBIE Account and Transaction Information API (AIS, shared standard)
The OBIE Read/Write Account and Transaction Information (AIS) standard for retrieving account, balance, transaction, and beneficiary data with customer consent, secured with FAP...
OBIE Payment Initiation API (PIS, shared standard)
The OBIE Read/Write Payment Initiation (PIS) standard for initiating domestic, scheduled, standing-order, international, and file payments with customer consent, secured with FA...
OBIE Confirmation of Funds API (CBPII, shared standard)
The OBIE Read/Write Confirmation of Funds (CBPII) standard for confirming whether funds are available on a payment account, secured with FAPI OAuth2/OIDC, mutual-TLS, and PSD2 s...
Leeds Building Society ATM API
Endpoint for getting ATM data
Leeds Building Society BCA API
Endpoint for getting Business Current Account data
Leeds Building Society Branch API
Endpoint for getting Branch data
Leeds Building Society CCC API
Endpoint for getting Commercial Credit Card data
Leeds Building Society PCA API
Endpoint for getting Personal Current Account data
Leeds Building Society SME API
Endpoint for getting Unsecured SME Loan data
Scroll within the panel for all 9 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Open Data API
OPEN COLLECTIONSecurity Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Leeds Building Society — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/leeds-building-society · machine-readable index on apis.io
This is an independent, third-party profile of Leeds Building Society, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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