Unique Domains

Unique Domains provides a searchable database of one-word domain names across over 500 TLDs, offering pricing, demand, and risk context. Users can explore available domains, filter by price, popularity, and TLD, and obtain detailed metrics such as median ask price, renewal costs, and brandability scores. The platform updates daily, delivering real-time data to help businesses and individuals identify valuable domain opportunities.

Unique Domains is listed with 2 APIs on the APIs.io network. Tagged areas include Domain, Data, Pricing, and Search.

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

Unique Domains’ developer surface includes signup flow, pricing, API reference, documentation, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.5/100 thin Agent 19/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

2 APIs

Domain Data Pricing Search

Kin Score

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

Composite quality — 32.5/100 · thin

Contract Quality 4.5 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 9.0 / 17

Operational Transparency 3.7 / 11

Contract Governance 2.2 / 10

Discoverability 4.4 / 9

Regulatory Posture 1.9 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 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 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):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
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) Ask about this →
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) 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 →

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 21.1 — up to +19.7 composite points Ask about this →
Developer Ergonomics scores 23.8 — up to +15.2 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 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/unique-domains/apis.yml: open an issue on github.com/api-evangelist/unique-domains 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 →

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 2

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

Unique Domains API

The Unique Domains API provides domain availability, pricing, registrar data, and comparable sales. Free calls need no key.

Unique Domains API

Unique Domains API as documented publicly: 80 operations. Contract generated from the documentation by API Evangelist (2026-11-12); not the provider's own document.

Unique Domains API pricing

Prices published by Unique Domains.

Plan	Price
Founder	$39 a month
Investor	$79 a month

Plan details, limits and sources →

Rate limits

free tier hourly: 60 calls an hour
free tier daily: 100 a day from one address
member key: at most 10 calls a second

All 4 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Unique Domains Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Unique Domains Rate Limits

4 limits

RATE LIMITS

Semantic Vocabularies 1

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

Unique Domains Context

3 classes · 2 properties

JSON-LD

Spectral Rules 1

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

Unique Domains API Rules

38 rules · 35 error-severity 2 warn-severity 1 info-severity

SPECTRAL

JSON Schema 3

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

GetV1DomainsDropsResponse

1 properties

JSON SCHEMA

GetV1NamesGetPlumbingRegistryResponse

1 properties

JSON SCHEMA

PostNamesBatchRequest

1 properties

JSON SCHEMA

Security Posture 1

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

Unique Domains Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conventions

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Newsroom

Newsroom

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: unique-domains
name: Unique Domains
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  probe_state: unreadable
  source:
  - plans
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
image: https://unique.domains/public/og/master-1200x630.png
description: Unique Domains provides a searchable database of one-word domain names across over 500 TLDs, offering pricing,
  demand, and risk context. Users can explore available domains, filter by price, popularity, and TLD, and obtain detailed
  metrics such as median ask price, renewal costs, and brandability scores. The platform updates daily, delivering real-time
  data to help businesses and individuals identify valuable domain opportunities.
url: https://artifacts.apis.io/unique-domains/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-12 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-12'
modified: '2026-11-12'
tags:
- Domain
- Data
- Pricing
- Search
tags_raw:
- Domain
- Data
- Pricing
- API
- Search
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/unique-domains-rate-limits.yml
- type: Plans
  url: plans/unique-domains-plans-pricing.yml
- type: Spectral
  url: rules/unique-domains-rules.yml
- type: JSONLD
  url: json-ld/unique-domains-context.jsonld
- type: Vocabulary
  url: vocabulary/unique-domains-vocabulary.yml
- type: DataModel
  url: data-model/unique-domains-data-model.yml
- type: Conventions
  url: conventions/unique-domains-conventions.yml
- type: Conformance
  url: conformance/unique-domains-conformance.yml
- type: LLMsTxt
  url: llms/unique-domains-llms.txt
- type: Hosts
  url: hosts/unique-domains-hosts.yml
- type: Vendors
  url: vendors/unique-domains-vendors.yml
- type: SDKs
  url: packages/unique-domains-packages.yml
- type: Packages
  url: packages/unique-domains-packages.yml
- type: TermsOfService
  url: https://unique.domains/terms
- type: SignUp
  url: https://unique.domains/business-ideas/trends/sign-up-bonus-apps
- type: PrivacyPolicy
  url: https://unique.domains/privacy
- type: Pricing
  url: https://unique.domains/pricing
- type: Newsroom
  url: https://unique.domains/news
- type: Leadership
  url: https://unique.domains/team
- type: GitHubOrganization
  url: https://github.com/uniquedomains
- type: APIReference
  url: https://unique.domains/llms.txt
- type: DomainSecurity
  url: security/unique-domains-domain-security.yml
- type: Website
  url: https://unique.domains
- type: Documentation
  url: https://unique.domains/api
apis:
- name: Unique Domains API
  description: The Unique Domains API provides domain availability, pricing, registrar data, and comparable sales. Free calls
    need no key.
  humanURL: https://unique.domains/api
  baseURL: null
  aid: unique-domains:unique-domains-api-2
- aid: unique-domains:unique-domains-api
  name: Unique Domains API
  description: 'Unique Domains API as documented publicly: 80 operations. Contract generated from the documentation by API
    Evangelist (2026-11-12); not the provider''s own document.'
  humanURL: https://unique.domains/api
  baseURL: https://api.unique.domains
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/unique-domains-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/unique-domains-post-names-batch-request-schema.json
  - type: JSONSchema
    url: json-schema/unique-domains-get-v1-domains-drops-response-schema.json
  - type: JSONSchema
    url: json-schema/unique-domains-get-v1-names-get-plumbing-registry-response-schema.json
x-submission-notes: Domain availability, registry record, registrar pricing and comparable sales API; keyless sample at api.unique.domains/v1/names/{name}
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The API documentation is HTML only and no OpenAPI/GraphQL/AsyncAPI spec could be found.
  evidence:
  - url: https://unique.domains/api
    status: 200
  checked: '2026-11-12'
x-submission-probe: root 200, control 404, /api 200, api.unique.domains sample 200
x-enrichment:
  date: '2026-11-12'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Unique Domains API — frequently asked questions

Does Unique Domains have an API?

Yes. APIs.io lists 2 APIs from Unique Domains, including Unique Domains API and Unique Domains API.

Is there an OpenAPI specification for the Unique Domains API?

Yes. APIs.io indexes 1 OpenAPI specification for Unique Domains, each linked for download from this page.

How much does the Unique Domains API cost?

Unique Domains publishes its prices; its Founder plan is $39 a month as of 2026-11-12. APIs.io lists 2 pricing plans for Unique Domains, with each plan's price, limits and inclusions under Pricing on this page.

Is the Unique Domains API ready for AI agents?

Unique Domains has a Kin Score of 32.5 out of 100 (thin) and an Agent Readiness score of 18.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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