Wordnik

Wordnik is the largest online English dictionary by number of words. Its v4 REST API exposes definitions from five dictionaries, etymologies, real example sentences from millions of sources, audio pronunciations, related-word relationships, frequency over time, hyphenation, bi-gram phrases, scrabble scores, random words, reverse-dictionary lookup, word-of-the-day, and authenticated user word lists.

Wordnik publishes 5 API contracts indexed on the APIs.io network, including Account API, Word API, Word List API, and 2 more. Tagged areas include Dictionaries, Word Data, English, Lexicography, and Public APIs.

The Wordnik catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Wordnik’s developer surface includes authentication, documentation, pricing, getting-started guide, signup flow, engineering blog, support, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

54.1/100 developing ▬ flat Agent 25/100 agent aware Front door AI 1/6 silent Heartbeat 80/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

DictionariesWord DataEnglishLexicographyPublic APIs

Kin Score

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

Composite quality — 54.1/100 · developing

Contract Quality 10.2 / 19

Developer Ergonomics 8.7 / 15

Access Clarity 11.1 / 15

Operational Transparency 2.6 / 10

Contract Governance 2.5 / 9

Discoverability 5.5 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 25/100 · 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 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 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 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
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)

7 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 54.2 — up to +11.5 composite points
Operational Transparency scores 26.3 — up to +9.6 composite points
Contract Governance scores 27.3 — up to +8.7 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/wordnik/apis.yml: open an issue on github.com/api-evangelist/wordnik 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
Obsidian Community Plugins (third-party APIs the Obsidian plugin ecosystem integrates)	standard	19.7 (thin)	-	-
APIs.guru OpenAPI Directory (API definition directory)	standard	19.7 (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 5

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

Wordnik Account API

API-key status and user authentication operations.

Wordnik Word API

Operations on a single English word (definitions, etymologies, examples, pronunciations, related words, frequency, hyphenation, phrases, scrabble score, audio).

Wordnik Word List API

Read and write operations on an individual user word list.

Wordnik Word Lists API

Create new user word lists.

Wordnik Words API

Cross-word operations (random words, reverse-dictionary search, full-text search, word-of-the-day).

Postman Collections 5

Ready-to-run Postman collections for exercising this provider's APIs.

Wordnik Account API

POSTMAN

Wordnik Account Word API

POSTMAN

Wordnik Account Word List API

POSTMAN

Wordnik Account Word Lists API

POSTMAN

Wordnik Account Words API

POSTMAN

Open Collections 6

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

Wordnik Account API

OPEN COLLECTION

Wordnik Account Word API

OPEN COLLECTION

Wordnik Account Word List API

OPEN COLLECTION

Wordnik Account Word Lists API

OPEN COLLECTION

Wordnik Account Words API

OPEN COLLECTION

Wordnik

OPEN COLLECTION

Wordnik API pricing

Prices published by Wordnik, read 2026-10-28 from developer.wordnik.com/pricing.

Plan	Price
Free Basic Plan	$0/ mo Includes: 100 calls/hour; free for nonprofit or research use; free trial for commercial use
Hobby	$10/ mo Includes: 1000 calls/hour
Pro	$59/ mo Includes: 20,000 calls/hour
Enterprise	$149/ mo Includes: 45,000 calls/hour

Plan details, limits and sources →

Rate limits

Basic (free) — hourly ceiling: 100 requests per hour
Hobby — hourly ceiling: 1000 requests per hour
Pro — hourly ceiling: 20000 requests per hour

Compiled by API Evangelist, not yet checked against Wordnik's documentation. All 5 limits →

Billed by: calls/hour · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Wordnik Plans Pricing

4 plans

PLANS

Wordnik Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Wordnik Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Wordnik

SLA

FinOps 1

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

Wordnik Finops

FINOPS

Semantic Vocabularies 1

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

Wordnik Context

37 classes · 116 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Wordnik — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

Wordnik API Rules

45 rules · 9 errors 30 warnings 6 info

SPECTRAL

JSON Schema 37

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

ApiTokenStatus

6 properties

JSON SCHEMA

AudioFile

14 properties

JSON SCHEMA

AudioType

2 properties

JSON SCHEMA

AuthenticationToken

3 properties

JSON SCHEMA

Bigram

5 properties

JSON SCHEMA

Citation

2 properties

JSON SCHEMA

ContentProvider

2 properties

JSON SCHEMA

Definition

16 properties

JSON SCHEMA

DefinitionSearchResults

2 properties

JSON SCHEMA

Example

12 properties

JSON SCHEMA

ExampleSearchResults

2 properties

JSON SCHEMA

ExampleUsage

1 properties

JSON SCHEMA

Facet

2 properties

JSON SCHEMA

FacetValue

2 properties

JSON SCHEMA

Frequency

2 properties

JSON SCHEMA

FrequencySummary

5 properties

JSON SCHEMA

Label

2 properties

JSON SCHEMA

Note

4 properties

JSON SCHEMA

PartOfSpeech

3 properties

JSON SCHEMA

7 properties

JSON SCHEMA

Root

3 properties

JSON SCHEMA

ScoredWord

11 properties

JSON SCHEMA

ScrabbleScoreResult

1 properties

JSON SCHEMA

Sentence

6 properties

JSON SCHEMA

SimpleDefinition

4 properties

JSON SCHEMA

SimpleExample

4 properties

JSON SCHEMA

StringValue

1 properties

JSON SCHEMA

Syllable

3 properties

JSON SCHEMA

TextPron

3 properties

JSON SCHEMA

User

8 properties

JSON SCHEMA

WordList

11 properties

JSON SCHEMA

WordListWord

7 properties

JSON SCHEMA

WordObject

6 properties

JSON SCHEMA

WordOfTheDay

12 properties

JSON SCHEMA

WordSearchResult

3 properties

JSON SCHEMA

WordSearchResults

2 properties

JSON SCHEMA

Scroll for all 37

JSON Structure 37

JSON Structure definitions describing this provider's data shapes.

Wordnik Api Token Status Structure

6 properties

JSON STRUCTURE

Wordnik Audio File Structure

14 properties

JSON STRUCTURE

Wordnik Audio Type Structure

2 properties

JSON STRUCTURE

Wordnik Authentication Token Structure

3 properties

JSON STRUCTURE

Wordnik Bigram Structure

5 properties

JSON STRUCTURE

Wordnik Category Structure

2 properties

JSON STRUCTURE

Wordnik Citation Structure

2 properties

JSON STRUCTURE

Wordnik Content Provider Structure

2 properties

JSON STRUCTURE

Wordnik Definition Search Results Structure

2 properties

JSON STRUCTURE

Wordnik Definition Structure

16 properties

JSON STRUCTURE

Wordnik Example Search Results Structure

2 properties

JSON STRUCTURE

Wordnik Example Structure

12 properties

JSON STRUCTURE

Wordnik Example Usage Structure

1 properties

JSON STRUCTURE

Wordnik Facet Structure

2 properties

JSON STRUCTURE

Wordnik Facet Value Structure

2 properties

JSON STRUCTURE

Wordnik Frequency Structure

2 properties

JSON STRUCTURE

Wordnik Frequency Summary Structure

5 properties

JSON STRUCTURE

Wordnik Label Structure

2 properties

JSON STRUCTURE

Wordnik Note Structure

4 properties

JSON STRUCTURE

Wordnik Part Of Speech Structure

3 properties

JSON STRUCTURE

Wordnik Related Structure

7 properties

JSON STRUCTURE

Wordnik Root Structure

3 properties

JSON STRUCTURE

Wordnik Scored Word Structure

11 properties

JSON STRUCTURE

Wordnik Scrabble Score Result Structure

1 properties

JSON STRUCTURE

Wordnik Sentence Structure

6 properties

JSON STRUCTURE

Wordnik Simple Definition Structure

4 properties

JSON STRUCTURE

Wordnik Simple Example Structure

4 properties

JSON STRUCTURE

Wordnik String Value Structure

1 properties

JSON STRUCTURE

Wordnik Syllable Structure

3 properties

JSON STRUCTURE

Wordnik Text Pron Structure

3 properties

JSON STRUCTURE

Wordnik User Structure

8 properties

JSON STRUCTURE

Wordnik Word List Structure

11 properties

JSON STRUCTURE

Wordnik Word List Word Structure

7 properties

JSON STRUCTURE

Wordnik Word Object Structure

6 properties

JSON STRUCTURE

Wordnik Word Of The Day Structure

12 properties

JSON STRUCTURE

Wordnik Word Search Result Structure

3 properties

JSON STRUCTURE

Wordnik Word Search Results Structure

2 properties

JSON STRUCTURE

Scroll for all 37

Examples 37

Example request and response payloads for these APIs.

Wordnik Api Token Status Example

6 fields

EXAMPLE

Wordnik Audio File Example

14 fields

EXAMPLE

Wordnik Audio Type Example

2 fields

EXAMPLE

Wordnik Authentication Token Example

3 fields

EXAMPLE

Wordnik Bigram Example

5 fields

EXAMPLE

Wordnik Category Example

2 fields

EXAMPLE

Wordnik Citation Example

2 fields

EXAMPLE

Wordnik Content Provider Example

2 fields

EXAMPLE

Wordnik Definition Example

16 fields

EXAMPLE

Wordnik Definition Search Results Example

2 fields

EXAMPLE

Wordnik Example Example

12 fields

EXAMPLE

Wordnik Example Search Results Example

2 fields

EXAMPLE

Wordnik Example Usage Example

1 fields

EXAMPLE

Wordnik Facet Example

2 fields

EXAMPLE

Wordnik Facet Value Example

2 fields

EXAMPLE

Wordnik Frequency Example

2 fields

EXAMPLE

Wordnik Frequency Summary Example

5 fields

EXAMPLE

Wordnik Label Example

2 fields

EXAMPLE

Wordnik Note Example

4 fields

EXAMPLE

Wordnik Part Of Speech Example

3 fields

EXAMPLE

Wordnik Related Example

7 fields

EXAMPLE

Wordnik Root Example

3 fields

EXAMPLE

Wordnik Scored Word Example

11 fields

EXAMPLE

Wordnik Scrabble Score Result Example

1 fields

EXAMPLE

Wordnik Sentence Example

6 fields

EXAMPLE

Wordnik Simple Definition Example

4 fields

EXAMPLE

Wordnik Simple Example Example

4 fields

EXAMPLE

Wordnik String Value Example

1 fields

EXAMPLE

Wordnik Syllable Example

3 fields

EXAMPLE

Wordnik Text Pron Example

3 fields

EXAMPLE

Wordnik User Example

8 fields

EXAMPLE

Wordnik Word List Example

11 fields

EXAMPLE

Wordnik Word List Word Example

7 fields

EXAMPLE

Wordnik Word Object Example

6 fields

EXAMPLE

Wordnik Word Of The Day Example

12 fields

EXAMPLE

Wordnik Word Search Result Example

3 fields

EXAMPLE

Wordnik Word Search Results Example

2 fields

EXAMPLE

Scroll for all 37

Security Posture 2

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

Wordnik Authentication

apiKey · 2 schemes

SECURITY

Wordnik Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Wordnik Agentic Access

28 operations · 6 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

SpectralRuleset

SpectralRuleset

JSONLDContext

JSONLDContext

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

Plans

FinOps

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 4

Properties that don't map to a standard resource type

Wordnik Public Word List

OpenSource

NYT First Said

OpenSource

Language Museums Dataset

OpenSource

PublicAPIsListing

PublicAPIsListing

Source (apis.yml)

aid: wordnik
name: Wordnik
description: Wordnik is the largest online English dictionary by number of words. Its v4 REST API exposes definitions from
  five dictionaries, etymologies, real example sentences from millions of sources, audio pronunciations, related-word relationships,
  frequency over time, hyphenation, bi-gram phrases, scrabble scores, random words, reverse-dictionary lookup, word-of-the-day,
  and authenticated user word lists.
url: https://developer.wordnik.com
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://wordnik.com/img/logo-wordnik-home.png
specificationVersion: '0.23'
created: '2026-05-28'
modified: '2026-05-29'
x-source: public-apis/public-apis
x-category: Dictionaries
x-tier: 2
x-tier-reason: enriched-from-bulk-public-apis-with-full-openapi-and-capability-pipeline
tags:
- Dictionaries
- Word Data
- English
- Lexicography
- Public APIs
tags_raw:
- Dictionaries
- Dictionary
- Word Data
- English
- Lexicography
- Public APIs
apis:
- aid: wordnik:wordnik-account-api
  name: Wordnik Account API
  description: API-key status and user authentication operations.
  humanURL: https://developer.wordnik.com
  baseURL: https://api.wordnik.com/v4
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/wordnik-account-api-openapi.yml
  - type: Documentation
    url: https://developer.wordnik.com/docs
  - type: GettingStarted
    url: https://developer.wordnik.com/gettingstarted
  - type: SDKs
    url: https://pypi.org/project/wordnik-py3/
  - type: SDKs
    url: https://pypi.org/project/wordnik/
  - type: SDKs
    url: https://rubygems.org/gems/wordnik
  - type: SDKs
    url: https://github.com/wordnik/wordnik-php
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/scala
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-word-api
  name: Wordnik Word API
  description: Operations on a single English word (definitions, etymologies, examples, pronunciations, related words, frequency,
    hyphenation, phrases, scrabble score, audio).
  humanURL: https://developer.wordnik.com
  baseURL: https://api.wordnik.com/v4
  tags:
  - Word
  properties:
  - type: OpenAPI
    url: openapi/wordnik-word-api-openapi.yml
  - type: Documentation
    url: https://developer.wordnik.com/docs
  - type: GettingStarted
    url: https://developer.wordnik.com/gettingstarted
  - type: SDKs
    url: https://pypi.org/project/wordnik-py3/
  - type: SDKs
    url: https://pypi.org/project/wordnik/
  - type: SDKs
    url: https://rubygems.org/gems/wordnik
  - type: SDKs
    url: https://github.com/wordnik/wordnik-php
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/scala
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-word-list-api
  name: Wordnik Word List API
  description: Read and write operations on an individual user word list.
  humanURL: https://developer.wordnik.com
  baseURL: https://api.wordnik.com/v4
  tags:
  - Word List
  properties:
  - type: OpenAPI
    url: openapi/wordnik-word-list-api-openapi.yml
  - type: Documentation
    url: https://developer.wordnik.com/docs
  - type: GettingStarted
    url: https://developer.wordnik.com/gettingstarted
  - type: SDKs
    url: https://pypi.org/project/wordnik-py3/
  - type: SDKs
    url: https://pypi.org/project/wordnik/
  - type: SDKs
    url: https://rubygems.org/gems/wordnik
  - type: SDKs
    url: https://github.com/wordnik/wordnik-php
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/scala
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-word-lists-api
  name: Wordnik Word Lists API
  description: Create new user word lists.
  humanURL: https://developer.wordnik.com
  baseURL: https://api.wordnik.com/v4
  tags:
  - Word Lists
  properties:
  - type: OpenAPI
    url: openapi/wordnik-word-lists-api-openapi.yml
  - type: Documentation
    url: https://developer.wordnik.com/docs
  - type: GettingStarted
    url: https://developer.wordnik.com/gettingstarted
  - type: SDKs
    url: https://pypi.org/project/wordnik-py3/
  - type: SDKs
    url: https://pypi.org/project/wordnik/
  - type: SDKs
    url: https://rubygems.org/gems/wordnik
  - type: SDKs
    url: https://github.com/wordnik/wordnik-php
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/scala
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-words-api
  name: Wordnik Words API
  description: Cross-word operations (random words, reverse-dictionary search, full-text search, word-of-the-day).
  humanURL: https://developer.wordnik.com
  baseURL: https://api.wordnik.com/v4
  tags:
  - Word
  tags_raw:
  - Words
  properties:
  - type: OpenAPI
    url: openapi/wordnik-words-api-openapi.yml
  - type: Documentation
    url: https://developer.wordnik.com/docs
  - type: GettingStarted
    url: https://developer.wordnik.com/gettingstarted
  - type: SDKs
    url: https://pypi.org/project/wordnik-py3/
  - type: SDKs
    url: https://pypi.org/project/wordnik/
  - type: SDKs
    url: https://rubygems.org/gems/wordnik
  - type: SDKs
    url: https://github.com/wordnik/wordnik-php
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/scala
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
  - type: SDKs
    url: https://github.com/wordnik/wordnik-clients/tree/master/objc
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/wordnik/overview
- type: AgenticAccess
  url: agentic-access/wordnik-agentic-access.yml
- type: DomainSecurity
  url: security/wordnik-domain-security.yml
- type: Authentication
  url: authentication/wordnik-authentication.yml
- type: Website
  url: https://wordnik.com
- type: Documentation
  url: https://developer.wordnik.com
- type: Pricing
  url: https://developer.wordnik.com/pricing
- type: GettingStarted
  url: https://developer.wordnik.com/gettingstarted
- type: Signup
  url: https://www.wordnik.com/signup
- type: Blog
  url: https://blog.wordnik.com
- type: StatusPage
  url: https://github.com/wordnik/wordnik-status
- type: GitHubOrganization
  url: https://github.com/wordnik
- type: Support
  url: mailto:apiteam@wordnik.com
- type: TermsOfService
  url: https://www.wordnik.com/about
- type: Plans
  url: plans/wordnik-plans-pricing.yml
- type: RateLimits
  url: rate-limits/wordnik-rate-limits.yml
- type: FinOps
  url: finops/wordnik-finops.yml
- type: Vocabulary
  url: vocabulary/wordnik-vocabulary.yml
- type: SpectralRuleset
  url: rules/wordnik-rules.yml
- type: JSONLDContext
  url: json-ld/wordnik-context.jsonld
- type: OpenSource
  title: Wordnik Public Word List
  url: https://github.com/wordnik/wordlist
- type: OpenSource
  title: NYT First Said
  url: https://github.com/wordnik/nyt-first-said
- type: OpenSource
  title: Language Museums Dataset
  url: https://github.com/wordnik/language-museums
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
features:
- name: Five Dictionary Sources
  description: Definitions are drawn from American Heritage (ahd-5), Wiktionary, Webster, Century, and WordNet — selectable
    per request via sourceDictionaries.
- name: Real-World Example Sentences
  description: Examples come from millions of sources rather than constructed example text, with citation metadata via /word.json/{word}/examples
    and /topExample.
- name: Audio Pronunciations
  description: AHD mp3 audio pronunciations exposed via /word.json/{word}/audio with time-expiring fileUrls.
- name: Word Graph Relationships
  description: Synonym, antonym, hypernym, hyponym, rhyme, and 17 other relationship types via /word.json/{word}/relatedWords.
- name: Frequency Over Time
  description: Annual usage counts from 1800 onward via /word.json/{word}/frequency for historical / linguistic research.
- name: Reverse Dictionary
  description: Natural-language query to candidate words via /words.json/reverseDictionary.
- name: Word Of The Day
  description: Curated daily word with definitions, examples, and editorial notes via /words.json/wordOfTheDay.
- name: User Word Lists
  description: Authenticated users can create, edit, and curate named word lists via /wordList.json and /wordLists.json.
useCases:
- name: Dictionary App
  description: Build a consumer-facing dictionary or thesaurus app using definitions, etymologies, pronunciations, and examples.
- name: Word Games
  description: Power crossword, scrabble, hangman, and word-discovery games using random words, search, and scrabble scoring.
- name: Vocabulary Learning
  description: Build a flashcard or vocabulary-coach app using user word lists, word of the day, and definitions across grade
    levels.
- name: Editorial Tooling
  description: Surface synonyms, antonyms, and reverse-dictionary lookup inside CMS / writing tools.
- name: Linguistic Research
  description: Use frequency-over-time data and the word-graph for academic linguistics and lexicographic research.
- name: Children's Education
  description: Use the forthcoming children's / student definitions tier for age-appropriate vocabulary apps.
integrations:
- name: Python (wordnik-py3)
  description: Official Python 3 client published to PyPI as `wordnik-py3`.
- name: Ruby (wordnik)
  description: Official Ruby gem published to RubyGems as `wordnik`.
- name: PHP
  description: Swagger-generated PHP client in wordnik/wordnik-php.
- name: Java
  description: Swagger-generated Java client in wordnik/wordnik-clients/java.
- name: Kotlin / Scala / Android / Objective-C
  description: Additional swagger-generated clients in wordnik/wordnik-clients.
solutions:
- name: Dictionary-Of-Record Integration
  description: Use Wordnik as the canonical dictionary for a product surface, hitting /word.json/{word}/definitions with sourceDictionaries
    selection logic.
- name: Quota-Aware Caching Layer
  description: Cache results aggressively per-word and use /account.json/apiTokenStatus telemetry plus X-RateLimit headers
    to right-size the Hobby / Pro / Enterprise tier.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Wordnik API — frequently asked questions

Does Wordnik have an API?

Yes. APIs.io lists 5 APIs from Wordnik, including Wordnik Account API, Wordnik Word API and Wordnik Word List API, and 2 more.

Is there an OpenAPI specification for the Wordnik API?

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

How do I authenticate with the Wordnik API?

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

How much does the Wordnik API cost?

Wordnik publishes its prices; its Free Basic Plan plan is $0/ mo as of 2026-10-28. APIs.io lists 4 pricing plans for Wordnik, with each plan's price, limits and inclusions under Pricing on this page.

Is the Wordnik API ready for AI agents?

Wordnik has a Kin Score of 54.1 out of 100 (developing) and an Agent Readiness score of 24.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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