LSEG

LSEG (London Stock Exchange Group) is a leading global financial markets infrastructure and data provider, offering a broad range of services including data & analytics, FTSE Russell indices, trading venues, FX, post‑trade solutions and risk intelligence. It serves customers worldwide, enabling sustainable growth and stability through trusted data and innovative technology platforms.

LSEG publishes 16 API contracts indexed on the APIs.io network, including Intelligent Tagging (Open PermID) API, World-Check One Case API, World-Check One Media-Check API, and 13 more. Tagged areas include Company, Finance, Data, Infrastructure, and Markets.

The LSEG catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

LSEG’s developer surface includes sandbox, support, getting-started guide, documentation, API reference, engineering blog, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.1/100 thin ▬ flat Agent 30/100 agent ready Front door AI 3/6 light Heartbeat 50/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

16 published contracts

Company Finance Data Infrastructure Markets Stock Exchange Market Data KYC Compliance

What this lets a business do 3

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Compliance Management

BC-130

CaseMedia-CheckZfs

POST /cases POST /cases/screeningRequest PUT /cases/{caseSystemId} PUT /cases/{caseSystemId}/ongoingScreening

Financial Crime Management

BC-1400

CaseClient-WatchlistZfs

PUT /reference/providers/sources/{identifier} POST /reference/watchlist POST /cases/screeningRequest

Banking Customer Management

BC-1300

Media-Check

POST /cases/{caseSystemId}/mediacheck/results GET /mediacheck/risks

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 39.1/100 · thin

Contract Quality 10.5 / 19

Developer Ergonomics 7.7 / 15

Access Clarity 2.4 / 15

Operational Transparency 0.3 / 10

Contract Governance 2.0 / 9

Discoverability 5.4 / 8

Regulatory Posture 3.2 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 15.8 — up to +16.8 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points
Contract Quality scores 55.9 — up to +11.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/lseg/apis.yml: open an issue on github.com/api-evangelist/lseg to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
RegTech, AML/KYC and Money Transmission	builds-on	41.1	-	-
Data Marketplaces (data providers on cloud data platforms)	builds-on	41.1	-	-
Private Markets and Fund Administration (ILPA, broker-dealer registration, options market-data vendors)	builds-on	41.1	-	-
IDE Extension Marketplaces (JetBrains, VS Code, Open VSX, Docker Verified Publishers, PyPI orgs)	builds-on	41.1	-	-
FINOS Open Source Fintech (members and project maintainers)	builds-on	41.1	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 16

Individual APIs this provider publishes, each with its own machine-readable definition.

LSEG Intelligent Tagging (Open PermID) API

LSEG API as documented publicly: 3 operations. Contract generated from the documentation by API Evangelist (2026-10-20); not the provider's own document.

LSEG World-Check One Case API

Create, screen, update, archive, assign, link, and search screening cases; review and resolve screening results; enable ongoing screening and retrieve ongoing screening updates ...

LSEG World-Check One Media-Check API

Retrieve MediaCheck adverse-media screening results, article metadata and content, attach or detach articles to cases, and mark articles as reviewed.

LSEG World-Check One Smart Filter API

Enable, disable, and retrieve the MediaCheck smart filter on screening cases.

LSEG World-Check One Audit API

Retrieve filtered audit events for screening cases to evidence compliance workflows.

LSEG World-Check One Case Rating API

Retrieve and update the risk rating on a screening case.

LSEG World-Check One Linked Cases API

Create, retrieve, and delete relationships between screening cases.

LSEG World-Check One Group API

Retrieve groups, case templates, and resolution toolkits that govern how cases are created and results resolved.

LSEG World-Check One User API

List active users in the client account for case assignment.

LSEG World-Check One Reference API

Reference data for screening - countries, nationalities, providers, search filters, World-Check profiles and records, and PEP details.

LSEG World-Check One Client Watchlist API

Maintain custom client watchlist sources and records for screening.

LSEG World-Check One Reporting API

Submit asynchronous case report requests, poll report status, and download completed reports.

LSEG World-Check One Upcoming API

Report status listing, report error details, and report cancellation operations.

LSEG World-Check One Passport Check API

Generate machine-readable zone (MRZ) data for passport verification.

LSEG World-Check One Zero Footprint Screening API

Zero Footprint Screening surface - synchronous screening, groups, case templates, reference data, and client watchlist maintenance without persisting case data.

LSEG World-Check One API Info API

Retrieve information about the public API, including the current API version.

Scroll for all 16

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Lseg Context

4 classes · 4 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

LSEG API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 15

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

London Stock Exchange Group Api Info Api Overlay

2 actions · update · london-stock-exchange-group-api-info-api-openapi.yml

DERIVED

London Stock Exchange Group Audit Api Overlay

2 actions · update · london-stock-exchange-group-audit-api-openapi.yml

DERIVED

London Stock Exchange Group Case Api Overlay

2 actions · update · london-stock-exchange-group-case-api-openapi.yml

DERIVED

London Stock Exchange Group Case Rating Api Overlay

2 actions · update · london-stock-exchange-group-case-rating-api-openapi.yml

DERIVED

London Stock Exchange Group Client Watchlist Api Overlay

2 actions · update · london-stock-exchange-group-client-watchlist-api-openapi.yml

DERIVED

London Stock Exchange Group Group Api Overlay

2 actions · update · london-stock-exchange-group-group-api-openapi.yml

DERIVED

London Stock Exchange Group Linked Cases Api Overlay

2 actions · update · london-stock-exchange-group-linked-cases-api-openapi.yml

DERIVED

London Stock Exchange Group Media Check Api Overlay

2 actions · update · london-stock-exchange-group-media-check-api-openapi.yml

DERIVED

London Stock Exchange Group Passport Check Api Overlay

2 actions · update · london-stock-exchange-group-passport-check-api-openapi.yml

DERIVED

London Stock Exchange Group Reference Api Overlay

2 actions · update · london-stock-exchange-group-reference-api-openapi.yml

DERIVED

London Stock Exchange Group Reporting Api Overlay

2 actions · update · london-stock-exchange-group-reporting-api-openapi.yml

DERIVED

London Stock Exchange Group Smart Filter Api Overlay

2 actions · update · london-stock-exchange-group-smart-filter-api-openapi.yml

DERIVED

London Stock Exchange Group Upcoming Api Overlay

2 actions · update · london-stock-exchange-group-upcoming-api-openapi.yml

DERIVED

London Stock Exchange Group User Api Overlay

2 actions · update · london-stock-exchange-group-user-api-openapi.yml

DERIVED

London Stock Exchange Group Zfs Api Overlay

2 actions · update · london-stock-exchange-group-zfs-api-openapi.yml

DERIVED

Scroll for all 15

JSON Schema 4

Standalone JSON Schema definitions for this provider's data models.

PostPermidCalaisRequest

3 properties

JSON SCHEMA

PostPermidCalaisResponse

1 properties

JSON SCHEMA

PostTagRsEnrichRequest

1 properties

JSON SCHEMA

PostTagRsEnrichResponse

1 properties

JSON SCHEMA

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Lseg Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Sandbox

Sandbox

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Conventions

Build 5

SDKs, sample code, and the tooling you integrate with

IntegrationEdges

IntegrationEdges

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: lseg
name: LSEG
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: gated
  source:
  - security
  - sandbox
  generated: '2026-11-06'
  method: derived
image: https://www.lseg.com/content/dam/lseg/en_us/images/logos/thumbnail/lseg-default-social-image.jpg.transform/rect-768/q90/image.jpg
description: LSEG (London Stock Exchange Group) is a leading global financial markets infrastructure and data provider, offering
  a broad range of services including data & analytics, FTSE Russell indices, trading venues, FX, post‑trade solutions and
  risk intelligence. It serves customers worldwide, enabling sustainable growth and stability through trusted data and innovative
  technology platforms.
url: https://raw.githubusercontent.com/api-evangelist/lseg/refs/heads/main/apis.yml
x-type: company
x-source: harvest:news
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-21 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-09-21'
modified: '2026-10-20'
tags:
- Company
- Finance
- Data
- Infrastructure
- Markets
- Stock Exchange
- Market Data
- KYC
- Compliance
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/lseg-capability-edges.yml
  name: LSEG Business Capability Map
- type: Spectral
  url: rules/lseg-rules.yml
- type: JSONLD
  url: json-ld/lseg-context.jsonld
- type: Vocabulary
  url: vocabulary/lseg-vocabulary.yml
- type: DataModel
  url: data-model/lseg-data-model.yml
- type: Conformance
  url: conformance/lseg-conformance.yml
- type: Hosts
  url: hosts/lseg-hosts.yml
- type: IntegrationEdges
  url: integrations/lseg-integration-edges.yml
- type: Vendors
  url: vendors/lseg-vendors.yml
- type: SDKs
  url: packages/lseg-packages.yml
- type: Packages
  url: packages/lseg-packages.yml
- type: WellKnown
  url: well-known/lseg-well-known.yml
- type: Conventions
  url: conventions/lseg-conventions.yml
- type: Sandbox
  url: sandbox/lseg-sandbox.yml
- type: TermsOfService
  url: https://developers.lseg.com/en/terms-of-use
- type: Support
  url: https://support.lseg.com/s/
- type: PrivacyPolicy
  url: https://www.lseg.com/en/policies/privacy-statement
- type: DeveloperPortal
  url: https://developers.lseg.com/en
- type: GettingStarted
  url: https://developers.lseg.com/en/api-catalog/app-studio/app-studio-web-sdk/quickstart
- type: Documentation
  url: https://developers.lseg.com/
- type: GitHubOrganization
  url: https://github.com/LSEG
- type: GitHubOrganization
  url: https://github.com/LSEG-API-Samples
- type: DomainSecurity
  url: security/lseg-domain-security.yml
- type: Website
  url: https://www.lseg.com/
- type: Documentation
  url: https://developers.lseg.com/en/api-catalog
- type: APIReference
  url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
- type: Blog
  url: https://developers.lseg.com/en/article-catalog
apis:
- aid: lseg:lseg-api
  name: LSEG Intelligent Tagging (Open PermID) API
  description: 'LSEG API as documented publicly: 3 operations. Contract generated from the documentation by API Evangelist
    (2026-10-20); not the provider''s own document.'
  humanURL: https://developers.lseg.com/en/api-catalog/open-perm-id/intelligent-tagging-restful-api/tutorials
  baseURL: https://api-eit.refinitiv.com
  x-base-note: api-eit.refinitiv.com is named on LSEG's Intelligent Tagging docs and answers /permid/match with an LSEG PermID
    401 'No API key found in request' (probed 2026-10-20); Refinitiv is LSEG's acquired data business.
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/lseg-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/lseg-post-permid-calais-request-schema.json
  - type: JSONSchema
    url: json-schema/lseg-post-tag-rs-enrich-response-schema.json
  - type: JSONSchema
    url: json-schema/lseg-post-tag-rs-enrich-request-schema.json
  - type: JSONSchema
    url: json-schema/lseg-post-permid-calais-response-schema.json
- aid: lseg:lseg-world-check-one-case-api
  name: LSEG World-Check One Case API
  description: Create, screen, update, archive, assign, link, and search screening cases; review and resolve screening results;
    enable ongoing screening and retrieve ongoing screening updates for KYC and third-party due diligence.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Screening
  - Compliance
  - Cases
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-case-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-case-api-overlay.yaml
- aid: lseg:lseg-world-check-one-media-check-api
  name: LSEG World-Check One Media-Check API
  description: Retrieve MediaCheck adverse-media screening results, article metadata and content, attach or detach articles
    to cases, and mark articles as reviewed.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Screening
  - Adverse Media
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-media-check-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-media-check-api-overlay.yaml
- aid: lseg:lseg-world-check-one-smart-filter-api
  name: LSEG World-Check One Smart Filter API
  description: Enable, disable, and retrieve the MediaCheck smart filter on screening cases.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Screening
  - Adverse Media
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-smart-filter-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-smart-filter-api-overlay.yaml
- aid: lseg:lseg-world-check-one-audit-api
  name: LSEG World-Check One Audit API
  description: Retrieve filtered audit events for screening cases to evidence compliance workflows.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Audit
  - Compliance
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-audit-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-audit-api-overlay.yaml
- aid: lseg:lseg-world-check-one-case-rating-api
  name: LSEG World-Check One Case Rating API
  description: Retrieve and update the risk rating on a screening case.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Risk Management
  - Compliance
  tags_raw:
  - KYC
  - Risk
  - Compliance
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-case-rating-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-case-rating-api-overlay.yaml
- aid: lseg:lseg-world-check-one-linked-cases-api
  name: LSEG World-Check One Linked Cases API
  description: Create, retrieve, and delete relationships between screening cases.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Cases
  - Compliance
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-linked-cases-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-linked-cases-api-overlay.yaml
- aid: lseg:lseg-world-check-one-group-api
  name: LSEG World-Check One Group API
  description: Retrieve groups, case templates, and resolution toolkits that govern how cases are created and results resolved.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Administration
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-group-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-group-api-overlay.yaml
- aid: lseg:lseg-world-check-one-user-api
  name: LSEG World-Check One User API
  description: List active users in the client account for case assignment.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Administration
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-user-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-user-api-overlay.yaml
- aid: lseg:lseg-world-check-one-reference-api
  name: LSEG World-Check One Reference API
  description: Reference data for screening - countries, nationalities, providers, search filters, World-Check profiles and
    records, and PEP details.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Reference Data
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-reference-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-reference-api-overlay.yaml
- aid: lseg:lseg-world-check-one-client-watchlist-api
  name: LSEG World-Check One Client Watchlist API
  description: Maintain custom client watchlist sources and records for screening.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Watchlist
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-client-watchlist-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-client-watchlist-api-overlay.yaml
- aid: lseg:lseg-world-check-one-reporting-api
  name: LSEG World-Check One Reporting API
  description: Submit asynchronous case report requests, poll report status, and download completed reports.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Reporting
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-reporting-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-reporting-api-overlay.yaml
- aid: lseg:lseg-world-check-one-upcoming-api
  name: LSEG World-Check One Upcoming API
  description: Report status listing, report error details, and report cancellation operations.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Reporting
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-upcoming-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-upcoming-api-overlay.yaml
- aid: lseg:lseg-world-check-one-passport-check-api
  name: LSEG World-Check One Passport Check API
  description: Generate machine-readable zone (MRZ) data for passport verification.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Identity Verification
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-passport-check-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-passport-check-api-overlay.yaml
- aid: lseg:lseg-world-check-one-zfs-api
  name: LSEG World-Check One Zero Footprint Screening API
  description: Zero Footprint Screening surface - synchronous screening, groups, case templates, reference data, and client
    watchlist maintenance without persisting case data.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-zero-footprint-screening-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Screening
  - Zero Footprint
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-zfs-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-zfs-api-overlay.yaml
- aid: lseg:lseg-world-check-one-api-info-api
  name: LSEG World-Check One API Info API
  description: Retrieve information about the public API, including the current API version.
  humanURL: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api
  baseURL: https://api-worldcheck.refinitiv.com/v2
  tags:
  - KYC
  - Metadata
  properties:
  - type: Documentation
    url: https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/documentation
  - type: OpenAPI
    url: openapi/london-stock-exchange-group-api-info-api-openapi.yml
  - type: Overlay
    url: overlays/london-stock-exchange-group-api-info-api-overlay.yaml
x-enrichment:
  date: '2026-10-20'
  status: enriched
  artifacts_added: 8
  pass: local-v5
x-coverage:
  state: gated
  reason: customer-only-docs
  method: derived
  generated: '2026-10-20'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes developer documentation but serves no machine-readable contract from it; its MCP endpoint
    (support.lseg.com/mcp/v1) answers 401, so access sits behind a customer login
  evidence:
  - url: https://support.lseg.com/mcp/v1
    status: 401
  - url: https://www.lseg.com/
    status: 200

LSEG API — frequently asked questions

Does LSEG have an API?

Yes. APIs.io lists 16 APIs from LSEG, including LSEG Intelligent Tagging (Open PermID) API, LSEG World-Check One Case API and LSEG World-Check One Media-Check API, and 13 more.

Is there an OpenAPI specification for the LSEG API?

Yes. APIs.io indexes 16 OpenAPI specifications for LSEG, each linked for download from this page.

Is the LSEG API ready for AI agents?

LSEG has a Kin Score of 39.1 out of 100 (thin) and an Agent Readiness score of 30.2 (agent-ready), scored by API Evangelist on 2026-11-06.

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