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.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Wordnik the way a machine reads it — 126 machine-readable artifacts across 5 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Wordnik scores 63.3/100 (strong), with a separate agent-readiness read of 48/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Wordnik
Each block below is one kind of artifact we hold for Wordnik. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 5
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
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).
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Wordnik
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Wordnik Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Wordnik Finops
FINOPSSemantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Wordnik Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Wordnik API Rules
SPECTRALWordnik API Rules
SPECTRALJSON Schema 37
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
ApiTokenStatus
JSON SCHEMAAudioFile
JSON SCHEMAAudioType
JSON SCHEMAAuthenticationToken
JSON SCHEMABigram
JSON SCHEMACategory
JSON SCHEMACitation
JSON SCHEMAContentProvider
JSON SCHEMADefinition
JSON SCHEMADefinitionSearchResults
JSON SCHEMAExample
JSON SCHEMAExampleSearchResults
JSON SCHEMAExampleUsage
JSON SCHEMAFacet
JSON SCHEMAFacetValue
JSON SCHEMAFrequency
JSON SCHEMAFrequencySummary
JSON SCHEMALabel
JSON SCHEMANote
JSON SCHEMAPartOfSpeech
JSON SCHEMARelated
JSON SCHEMARoot
JSON SCHEMAScoredWord
JSON SCHEMAScrabbleScoreResult
JSON SCHEMASentence
JSON SCHEMASimpleDefinition
JSON SCHEMASimpleExample
JSON SCHEMAStringValue
JSON SCHEMASyllable
JSON SCHEMATextPron
JSON SCHEMAUser
JSON SCHEMAWordList
JSON SCHEMAWordListWord
JSON SCHEMAWordObject
JSON SCHEMAWordOfTheDay
JSON SCHEMAWordSearchResult
JSON SCHEMAWordSearchResults
JSON SCHEMAScroll within the panel for all 37 ·
JSON Structure 37
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Wordnik Api Token Status Structure
JSON STRUCTUREWordnik Audio File Structure
JSON STRUCTUREWordnik Audio Type Structure
JSON STRUCTUREWordnik Authentication Token Structure
JSON STRUCTUREWordnik Bigram Structure
JSON STRUCTUREWordnik Category Structure
JSON STRUCTUREWordnik Citation Structure
JSON STRUCTUREWordnik Content Provider Structure
JSON STRUCTUREWordnik Definition Search Results Structure
JSON STRUCTUREWordnik Definition Structure
JSON STRUCTUREWordnik Example Search Results Structure
JSON STRUCTUREWordnik Example Structure
JSON STRUCTUREWordnik Example Usage Structure
JSON STRUCTUREWordnik Facet Structure
JSON STRUCTUREWordnik Facet Value Structure
JSON STRUCTUREWordnik Frequency Structure
JSON STRUCTUREWordnik Frequency Summary Structure
JSON STRUCTUREWordnik Label Structure
JSON STRUCTUREWordnik Note Structure
JSON STRUCTUREWordnik Part Of Speech Structure
JSON STRUCTUREWordnik Related Structure
JSON STRUCTUREWordnik Root Structure
JSON STRUCTUREWordnik Scored Word Structure
JSON STRUCTUREWordnik Scrabble Score Result Structure
JSON STRUCTUREWordnik Sentence Structure
JSON STRUCTUREWordnik Simple Definition Structure
JSON STRUCTUREWordnik Simple Example Structure
JSON STRUCTUREWordnik String Value Structure
JSON STRUCTUREWordnik Syllable Structure
JSON STRUCTUREWordnik Text Pron Structure
JSON STRUCTUREWordnik User Structure
JSON STRUCTUREWordnik Word List Structure
JSON STRUCTUREWordnik Word List Word Structure
JSON STRUCTUREWordnik Word Object Structure
JSON STRUCTUREWordnik Word Of The Day Structure
JSON STRUCTUREWordnik Word Search Result Structure
JSON STRUCTUREWordnik Word Search Results Structure
JSON STRUCTUREScroll within the panel for all 37 ·
Examples 37
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Wordnik Audio File Example
EXAMPLEWordnik Audio Type Example
EXAMPLEWordnik Bigram Example
EXAMPLEWordnik Category Example
EXAMPLEWordnik Citation Example
EXAMPLEWordnik Definition Example
EXAMPLEWordnik Example Example
EXAMPLEWordnik Facet Example
EXAMPLEWordnik Facet Value Example
EXAMPLEWordnik Frequency Example
EXAMPLEWordnik Label Example
EXAMPLEWordnik Note Example
EXAMPLEWordnik Related Example
EXAMPLEWordnik Root Example
EXAMPLEWordnik Scored Word Example
EXAMPLEWordnik Sentence Example
EXAMPLEWordnik String Value Example
EXAMPLEWordnik Syllable Example
EXAMPLEWordnik Text Pron Example
EXAMPLEWordnik User Example
EXAMPLEWordnik Word List Example
EXAMPLEWordnik Word Object Example
EXAMPLEScroll within the panel for all 37 ·
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Wordnik — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 4
Properties that don't map to a standard resource type
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