what3words

what3words has divided the world into a grid of three-metre squares and given each one a unique three-word address (e.g. ///filled.count.soap). The what3words Public API converts between three-word addresses and latitude / longitude coordinates, offers an AutoSuggest with autocorrect for voice/typing input, exposes supported languages and locale variants, and returns grid sections as GeoJSON. The API is HTTPS GET only, authenticated by API key in a query parameter or X-Api-Key header, and is wrapped by official SDKs for Swift, Android, Java, JavaScript, Python, PHP, and .NET, plus UI components for map and OCR experiences.

what3words publishes 20 API contracts indexed on the APIs.io network, including Autosuggest API, Available Languages API, Convert To 3wa API, and 17 more. Tagged areas include Geocoding, Addressing, Location, Three Word Address, and Maps.

The what3words catalog on APIs.io includes 1 Spectral governance ruleset.

what3words’ developer surface includes engineering blog, authentication, documentation, GitHub presence, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

24.6/100 emerging ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent Heartbeat 81/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract

Geocoding Addressing LocationThree Word AddressMaps Geospatial

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 24.6/100 · emerging

Contract Quality 9.2 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 0.7 / 17

Operational Transparency 1.0 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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 4 / 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 4.3 — up to +19.1 composite points Ask about this →
Developer Ergonomics scores 23.8 — up to +15.2 composite points Ask about this →
Contract Quality scores 43.5 — up to +14.1 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/what3words/apis.yml: open an issue on github.com/api-evangelist/what3words 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
Geospatial and Maps (OGC standards)	standard	17.2 (thin)	-	-
Overture Maps Foundation (members + data contributors)	standard	17.2 (thin)	-	-

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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 20

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

what3words Public API

REST API for converting between three-word addresses and latitude / longitude coordinates, with AutoSuggest, available-languages, and grid-section endpoints. JSON or GeoJSON res...

what3words convert-to-3wa Endpoint

Converts a latitude / longitude coordinate into a three-word address in a chosen language.

what3words convert-to-coordinates Endpoint

Converts a three-word address into a latitude / longitude coordinate and a bounding square.

what3words AutoSuggest Endpoint

Validates and autocorrects partial or imperfect three-word input, returning ranked suggestions. Supports focus, clipping by polygon, country, bounding box or circle, and voice-i...

what3words available-languages Endpoint

Returns all supported what3words languages and locale variants.

what3words grid-section Endpoint

Returns the what3words three-metre grid for a specified bounding box as JSON or GeoJSON, suitable for map overlays.

what3words JavaScript SDK

Official JavaScript wrapper around the what3words Public API for browser and Node.js applications.

what3words Python SDK

Official Python wrapper around the what3words Public API.

what3words Java SDK

Official Java wrapper around the what3words Public API for server-side JVM applications.

what3words PHP SDK

Official PHP wrapper around the what3words Public API.

what3words Swift SDK

Official Swift wrapper around the what3words Public API for iOS, iPadOS, and macOS applications.

what3words Android SDK

Official Android wrapper around the what3words Public API for native Android applications.

what3words Swift Map Components

UI components for embedding what3words grids, markers, and AutoSuggest experiences in Apple Maps-based iOS and iPadOS applications.

what3words OCR Camera Component

UI component that uses the device camera to scan three-word addresses from signage, packaging, or printed materials.

what3words API Docs and OpenAPI Repository

Public repository hosting the OpenAPI specification, LLM files, and reference material for the what3words Public API.

what3words Autosuggest API

The Autosuggest API from what3words — 1 operation(s) for autosuggest.

what3words Available Languages API

The Available Languages API from what3words — 1 operation(s) for available languages.

what3words Convert To 3wa API

The Convert To 3wa API from what3words — 1 operation(s) for convert to 3wa.

what3words Convert To Coordinates API

The Convert To Coordinates API from what3words — 1 operation(s) for convert to coordinates.

what3words Grid Section API

The Grid Section API from what3words — 1 operation(s) for grid section.

Scroll for all 20

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

what3words Public Autosuggest API

OPEN COLLECTION

what3words Public Autosuggest Available Languages API

OPEN COLLECTION

what3words Public Autosuggest Convert To 3wa API

OPEN COLLECTION

what3words Public Autosuggest Convert To Coordinates API

OPEN COLLECTION

what3words Public Autosuggest Grid Section API

OPEN COLLECTION

what3words Public API

OPEN COLLECTION

what3words API pricing

Not yet checked against what3words's own pricing page. Compiled by API Evangelist on 2026-05-22; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Pro Tier Default: 120 requests per minute

Compiled by API Evangelist, not yet checked against what3words's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

what3words Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

what3words Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

what3words Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

what3words API Rules

49 rules · 47 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

what3words Authentication

apiKey · 2 schemes

SECURITY

what3words Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

what3words Agentic Access

5 operations

5 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Blog

Blog

LinkedIn

Website

Website

Source (apis.yml)

aid: what3words
url: https://raw.githubusercontent.com/api-evangelist/what3words/refs/heads/main/apis.yml
name: what3words
kind: company
description: what3words has divided the world into a grid of three-metre squares and given each one a unique three-word address
  (e.g. ///filled.count.soap). The what3words Public API converts between three-word addresses and latitude / longitude coordinates,
  offers an AutoSuggest with autocorrect for voice/typing input, exposes supported languages and locale variants, and returns
  grid sections as GeoJSON. The API is HTTPS GET only, authenticated by API key in a query parameter or X-Api-Key header,
  and is wrapped by official SDKs for Swift, Android, Java, JavaScript, Python, PHP, and .NET, plus UI components for map
  and OCR experiences.
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - what3words/w3w-android-wrapper
    - what3words/w3w-java-wrapper
    - what3words/w3w-node-wrapper
    - what3words/w3w-php-wrapper
    - what3words/w3w-python-wrapper
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/what3words.png
tags:
- Geocoding
- Addressing
- Location
- Three Word Address
- Maps
- Geospatial
created: '2026-05-23'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: what3words:public-api
  name: what3words Public API
  description: REST API for converting between three-word addresses and latitude / longitude coordinates, with AutoSuggest,
    available-languages, and grid-section endpoints. JSON or GeoJSON response formats. Authenticated via the X-Api-Key header
    or a key query parameter.
  humanURL: https://developer.what3words.com/public-api/docs
  baseURL: https://api.what3words.com/v3
  tags:
  - REST API
  - Geocoding
  - Addressing
  properties:
  - type: Documentation
    url: https://developer.what3words.com/public-api/docs
  - type: Repository
    url: https://github.com/what3words/what3words-api-docs
- aid: what3words:convert-to-3wa
  name: what3words convert-to-3wa Endpoint
  description: Converts a latitude / longitude coordinate into a three-word address in a chosen language.
  humanURL: https://developer.what3words.com/public-api/docs#convert-to-3wa
  baseURL: https://api.what3words.com/v3/convert-to-3wa
  tags:
  - Reverse Geocoding
  tags_raw:
  - Reverse Geocoding
  - Endpoint
  properties:
  - type: Documentation
    url: https://developer.what3words.com/public-api/docs#convert-to-3wa
- aid: what3words:convert-to-coordinates
  name: what3words convert-to-coordinates Endpoint
  description: Converts a three-word address into a latitude / longitude coordinate and a bounding square.
  humanURL: https://developer.what3words.com/public-api/docs#convert-to-coordinates
  baseURL: https://api.what3words.com/v3/convert-to-coordinates
  tags:
  - Forward Geocoding
  tags_raw:
  - Forward Geocoding
  - Endpoint
  properties:
  - type: Documentation
    url: https://developer.what3words.com/public-api/docs#convert-to-coordinates
- aid: what3words:autosuggest
  name: what3words AutoSuggest Endpoint
  description: Validates and autocorrects partial or imperfect three-word input, returning ranked suggestions. Supports focus,
    clipping by polygon, country, bounding box or circle, and voice-input modes.
  humanURL: https://developer.what3words.com/public-api/docs#autosuggest
  baseURL: https://api.what3words.com/v3/autosuggest
  tags:
  - Autosuggest
  - Voice
  tags_raw:
  - AutoSuggest
  - Endpoint
  - Voice
  properties:
  - type: Documentation
    url: https://developer.what3words.com/public-api/docs#autosuggest
- aid: what3words:available-languages
  name: what3words available-languages Endpoint
  description: Returns all supported what3words languages and locale variants.
  humanURL: https://developer.what3words.com/public-api/docs#available-languages
  baseURL: https://api.what3words.com/v3/available-languages
  tags:
  - Language
  tags_raw:
  - Languages
  - Endpoint
  properties:
  - type: Documentation
    url: https://developer.what3words.com/public-api/docs#available-languages
- aid: what3words:grid-section
  name: what3words grid-section Endpoint
  description: Returns the what3words three-metre grid for a specified bounding box as JSON or GeoJSON, suitable for map overlays.
  humanURL: https://developer.what3words.com/public-api/docs#grid-section
  baseURL: https://api.what3words.com/v3/grid-section
  tags:
  - Grid
  - GeoJSON
  tags_raw:
  - Grid
  - GeoJSON
  - Endpoint
  properties:
  - type: Documentation
    url: https://developer.what3words.com/public-api/docs#grid-section
- aid: what3words:javascript-sdk
  name: what3words JavaScript SDK
  description: Official JavaScript wrapper around the what3words Public API for browser and Node.js applications.
  humanURL: https://github.com/what3words/w3w-node-wrapper
  baseURL: https://github.com/what3words/w3w-node-wrapper
  tags:
  - SDK
  - JavaScript
  properties:
  - type: Repository
    url: https://github.com/what3words/w3w-node-wrapper
- aid: what3words:python-sdk
  name: what3words Python SDK
  description: Official Python wrapper around the what3words Public API.
  humanURL: https://github.com/what3words/w3w-python-wrapper
  baseURL: https://github.com/what3words/w3w-python-wrapper
  tags:
  - SDK
  - Python
  properties:
  - type: Repository
    url: https://github.com/what3words/w3w-python-wrapper
- aid: what3words:java-sdk
  name: what3words Java SDK
  description: Official Java wrapper around the what3words Public API for server-side JVM applications.
  humanURL: https://github.com/what3words/w3w-java-wrapper
  baseURL: https://github.com/what3words/w3w-java-wrapper
  tags:
  - SDK
  - Java
  properties:
  - type: Repository
    url: https://github.com/what3words/w3w-java-wrapper
- aid: what3words:php-sdk
  name: what3words PHP SDK
  description: Official PHP wrapper around the what3words Public API.
  humanURL: https://github.com/what3words/w3w-php-wrapper
  baseURL: https://github.com/what3words/w3w-php-wrapper
  tags:
  - SDK
  - PHP
  properties:
  - type: Repository
    url: https://github.com/what3words/w3w-php-wrapper
- aid: what3words:swift-sdk
  name: what3words Swift SDK
  description: Official Swift wrapper around the what3words Public API for iOS, iPadOS, and macOS applications.
  humanURL: https://github.com/what3words/w3w-swift-wrapper
  baseURL: https://github.com/what3words/w3w-swift-wrapper
  tags:
  - SDK
  - Swift
  - iOS
  properties:
  - type: Repository
    url: https://github.com/what3words/w3w-swift-wrapper
- aid: what3words:android-sdk
  name: what3words Android SDK
  description: Official Android wrapper around the what3words Public API for native Android applications.
  humanURL: https://github.com/what3words/w3w-android-wrapper
  baseURL: https://github.com/what3words/w3w-android-wrapper
  tags:
  - SDK
  - Android
  properties:
  - type: Repository
    url: https://github.com/what3words/w3w-android-wrapper
- aid: what3words:swift-components-map
  name: what3words Swift Map Components
  description: UI components for embedding what3words grids, markers, and AutoSuggest experiences in Apple Maps-based iOS
    and iPadOS applications.
  humanURL: https://github.com/what3words/w3w-swift-components
  baseURL: https://github.com/what3words/w3w-swift-components
  tags:
  - Components
  - Swift
  - Maps
  tags_raw:
  - Components
  - Swift
  - Map
  properties:
  - type: Repository
    url: https://github.com/what3words/w3w-swift-components
- aid: what3words:ocr-component
  name: what3words OCR Camera Component
  description: UI component that uses the device camera to scan three-word addresses from signage, packaging, or printed materials.
  humanURL: https://github.com/what3words
  baseURL: https://github.com/what3words
  tags:
  - OCR
  - Camera
  - Components
  tags_raw:
  - OCR
  - Camera
  - Component
  properties:
  - type: Repository
    url: https://github.com/what3words
- aid: what3words:api-docs-repo
  name: what3words API Docs and OpenAPI Repository
  description: Public repository hosting the OpenAPI specification, LLM files, and reference material for the what3words Public
    API.
  humanURL: https://github.com/what3words/what3words-api-docs
  baseURL: https://github.com/what3words/what3words-api-docs
  tags:
  - OpenAPI
  - Documentation
  - Open Source
  tags_raw:
  - OpenAPI
  - Documentation
  - Open Source
  - Open-Source
  properties:
  - type: Repository
    url: https://github.com/what3words/what3words-api-docs
- aid: what3words:what3words-autosuggest-api
  name: what3words Autosuggest API
  description: The Autosuggest API from what3words — 1 operation(s) for autosuggest.
  humanURL: https://developer.what3words.com/public-api/docs
  baseURL: https://api.what3words.com/v3
  tags:
  - Autosuggest
  properties:
  - type: OpenAPI
    url: openapi/what3words-autosuggest-api-openapi.yml
- aid: what3words:what3words-available-languages-api
  name: what3words Available Languages API
  description: The Available Languages API from what3words — 1 operation(s) for available languages.
  humanURL: https://developer.what3words.com/public-api/docs
  baseURL: https://api.what3words.com/v3
  tags:
  - Available Languages
  properties:
  - type: OpenAPI
    url: openapi/what3words-available-languages-api-openapi.yml
- aid: what3words:what3words-convert-to-3wa-api
  name: what3words Convert To 3wa API
  description: The Convert To 3wa API from what3words — 1 operation(s) for convert to 3wa.
  humanURL: https://developer.what3words.com/public-api/docs
  baseURL: https://api.what3words.com/v3
  tags:
  - Convert To 3wa
  properties:
  - type: OpenAPI
    url: openapi/what3words-convert-to-3wa-api-openapi.yml
- aid: what3words:what3words-convert-to-coordinates-api
  name: what3words Convert To Coordinates API
  description: The Convert To Coordinates API from what3words — 1 operation(s) for convert to coordinates.
  humanURL: https://developer.what3words.com/public-api/docs
  baseURL: https://api.what3words.com/v3
  tags:
  - Convert To Coordinates
  properties:
  - type: OpenAPI
    url: openapi/what3words-convert-to-coordinates-api-openapi.yml
- aid: what3words:what3words-grid-section-api
  name: what3words Grid Section API
  description: The Grid Section API from what3words — 1 operation(s) for grid section.
  humanURL: https://developer.what3words.com/public-api/docs
  baseURL: https://api.what3words.com/v3
  tags:
  - Grid Section
  properties:
  - type: OpenAPI
    url: openapi/what3words-grid-section-api-openapi.yml
common:
- url: https://what3words.com/news
  type: Blog
- type: IssueTracker
  url: https://github.com/what3words/what3words-api-docs/issues
- type: AgenticAccess
  url: agentic-access/what3words-agentic-access.yml
- type: DomainSecurity
  url: security/what3words-domain-security.yml
- type: Authentication
  url: authentication/what3words-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/what3words
- type: Website
  url: https://what3words.com/
- type: Documentation
  url: https://developer.what3words.com/public-api/docs
- type: GitHub
  url: https://github.com/what3words
- type: Plans
  url: plans/what3words-plans-pricing.yml
- type: RateLimits
  url: rate-limits/what3words-rate-limits.yml
- type: FinOps
  url: finops/what3words-finops.yml
- type: Integrations
  url: https://what3words.com/business/
integrations:
- name: Mercedes-Benz
- name: Ford
- name: Subaru
- name: Lamborghini
- name: Triumph
- name: TomTom
- name: HERE
- name: Google
- name: Microsoft
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

what3words API — frequently asked questions

Does what3words have an API?

Yes. APIs.io lists 20 APIs from what3words, including what3words Public API, what3words convert-to-3wa Endpoint and what3words convert-to-coordinates Endpoint, and 17 more.

Is there an OpenAPI specification for the what3words API?

Yes. APIs.io indexes 5 OpenAPI specifications for what3words, each linked for download from this page.

How do I authenticate with the what3words API?

what3words uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as what3words Authentication.

How much does the what3words API cost?

APIs.io lists 1 pricing plan for what3words, with each plan's price, limits and inclusions under Pricing on this page.

Is the what3words API ready for AI agents?

what3words has a Kin Score of 24.6 out of 100 (emerging) and an Agent Readiness score of 20.7 (agent-aware), scored by API Evangelist on 2026-11-13.

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curl "https://apis.io/api/v1/providers/what3words/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/what3words/evidence"

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