Westlaw

Westlaw, a Thomson Reuters legal research platform, provides AI‑enhanced tools, extensive case law, statutes, and practical guidance for law firms, businesses, and government agencies. Leveraging over 175 years of legal expertise, Westlaw delivers trusted research, drafting assistance, and compliance solutions across a wide range of practice areas.

Westlaw is listed with 1 API on the APIs.io network. Tagged areas include Legal Tech, Research, Artificial Intelligence, Thomson Reuters, and Westlaw.

Westlaw’s developer surface includes support, pricing, changelog, engineering blog, getting-started guide, documentation, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

20.0/100 emerging ▼ -10.0 Agent 0/100 human only Front door AI 6/6 dominant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API

Legal Tech Research Artificial Intelligence Thomson ReutersWestlaw

Kin Score

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

Composite quality — 20.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 9.2 / 17

Operational Transparency 0.9 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 1.4 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 16.7 — up to +16.7 composite points
Operational Transparency scores 7.9 — up to +12.0 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/westlaw/apis.yml: open an issue on github.com/api-evangelist/westlaw 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 →

APIs 1

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

Westlaw API

Developer portal for Westlaw APIs and integration resources.

Westlaw API pricing

Prices published by Westlaw, read 2026-10-07 from legal.thomsonreuters.com/en/westlaw/plans-and-pricing.

Plan	Price
Westlaw Advantage	View Westlaw Advantage pricing
Westlaw Edge	View Westlaw Edge pricing
Westlaw Edge with AI-Assisted Research	View Westlaw Edge with AI-Assisted Research pricing

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Westlaw Plans Pricing

3 plans

PLANS

Security Posture 1

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

Westlaw Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 4

The organization behind the API

BlogRSS

Newsroom

Blog

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: westlaw
name: Westlaw
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: unreadable
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://legal.thomsonreuters.com/content/dam/ue/en-us/images/og-image/243454.png.transform/rect-768/q90/image.png
description: Westlaw, a Thomson Reuters legal research platform, provides AI‑enhanced tools, extensive case law, statutes,
  and practical guidance for law firms, businesses, and government agencies. Leveraging over 175 years of legal expertise,
  Westlaw delivers trusted research, drafting assistance, and compliance solutions across a wide range of practice areas.
url: https://raw.githubusercontent.com/api-evangelist/westlaw/refs/heads/main/apis.yml
x-type: company
x-source: harvest:legal
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-23 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-09-23'
modified: '2026-10-06'
tags:
- Legal Tech
- Research
- Artificial Intelligence
- Thomson Reuters
- Westlaw
tags_raw:
- LegalTech
- Research
- AI
- ThomsonReuters
- Westlaw
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/westlaw-plans-pricing.yml
- url: https://legal.thomsonreuters.com/blog/feed/
  type: BlogRSS
- type: Hosts
  url: hosts/westlaw-hosts.yml
- type: Vendors
  url: vendors/westlaw-vendors.yml
- type: TermsOfService
  url: https://www.thomsonreuters.com/en/terms-of-use.html
- type: Support
  url: https://legal.thomsonreuters.com/en/support
- type: SDKs
  url: https://legal.thomsonreuters.com/en/products/practical-law/government/libraries
- type: PrivacyPolicy
  url: https://www.thomsonreuters.com/en/privacy-statement
- type: Pricing
  url: https://legal.thomsonreuters.com/en/westlaw/plans-and-pricing
- type: Newsroom
  url: https://legal.thomsonreuters.com/en/insights/reports/2025-state-of-corporate-law-department-report/media
- type: Login
  url: https://community.thomsonreuters.com/login
- type: ChangeLog
  url: https://legal.thomsonreuters.com/en/products/highq/whats-new
- type: Blog
  url: https://legal.thomsonreuters.com/blog/
- type: GettingStarted
  url: https://legal.thomsonreuters.com/en/insights/white-papers/building-digital-trust-into-your-onboarding-tech-stack
- type: Documentation
  url: https://developers.thomsonreuters.com/
- type: DomainSecurity
  url: security/westlaw-domain-security.yml
- type: Website
  url: https://legal.thomsonreuters.com/en/westlaw
apis:
- name: Westlaw API
  description: Developer portal for Westlaw APIs and integration resources.
  humanURL: https://developers.thomsonreuters.com/
  aid: westlaw:westlaw-api
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Developer portal renders JavaScript and provides no machine‑readable OpenAPI, GraphQL, AsyncAPI, or WSDL specifications.
  evidence:
  - url: https://developers.thomsonreuters.com/
    status: 200
  checked: 2026-09-23
x-enrichment:
  date: '2026-09-23'
  status: enriched
  artifacts_added: 4
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local

Westlaw API — frequently asked questions

Does Westlaw have an API?

Yes. APIs.io lists 1 API from Westlaw, including Westlaw API.

How much does the Westlaw API cost?

Westlaw publishes its prices; its Westlaw Advantage plan is View Westlaw Advantage pricing as of 2026-10-07. APIs.io lists 3 pricing plans for Westlaw, with each plan's price, limits and inclusions under Pricing on this page.

Is the Westlaw API ready for AI agents?

Westlaw has a Kin Score of 20.0 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-06.

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