Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 2 Complete, well-documented, and agent-ready

WhoisFreaks MCP ServerOfficial open-source Model Context Protocol server (Java) exposing 14 WhoisFreaks domain-intelligence tools...67.0 WhoisFreaks WHOIS APIWHOIS lookup APIs (live, historical, reverse, bulk)67.0

Strong 4 Solid coverage with minor gaps

IPinfo Whois APIIP WHOIS API64.6 APIVerve GraphQL API (alpha)Single GraphQL endpoint that fans out to multiple APIs in one request. Explicitly labeled alpha / not for p...60.8 APIVerve MCP ServerHosted remote MCP server (streamable HTTP) exposing every catalog endpoint as individual MCP tools with inp...60.8 APIFreaks MCP ServerOfficial first-party Model Context Protocol server (Apache-2.0) exposing 59 read-only tools across 13 categ...58.3

Developing 1 Usable, with meaningful gaps to close

MCP360 Whois APIThe whois API from MCP360 — 3 operation(s) for whois.51.8

Thin 2 Limited public surface area

Digital Shadows SearchLight Portal APIREST API of the Digital Shadows SearchLight digital-risk-protection portal, operated by ReliaQuest since it...37.7 Chaitin Tech 资产/种子/域名 WHOIS APIThe 资产/种子/域名 WHOIS API from Chaitin Tech — 6 operation(s) for 资产/种子/域名 whois.34.4

Emerging 1 Early or largely undocumented

QName AI WHOIS REST APIApproval-gated REST API for WHOIS/RDAP lookups: GET /api/whois/{domain} (single), POST /api/whois/batch (ba...26.0

Minimal 1 Almost no public developer surface

QName AI WHOIS REST APIApproval-gated REST API for WHOIS/RDAP lookups: GET /api/whois/{domain} (single), POST /api/whois/batch (ba...7.3

Companies reaching this through an API (2)

These companies publish an API, specification or operation carrying “WHOIS” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Chaitin Tech ReliaQuest

Score breakdown

Frequency

42.0

log-scaled weighted occurrences

Breadth

0.4

spread across providers

Quality lift

54.3

mean composite of providers using it

Cohesion

0.7

strength of nearest seed neighbor

Where this tag comes from

Provider tag14

Api tag12

Openapi tag4

Openapi op tag22

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get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
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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Call it yourself

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This tag

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All tags

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As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/whois"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/whois/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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WHOIS

Providers using this tag (14)

APIs with this tag (11)