rdapapi-io

RDAP API provides developers with a modern, JSON-native WHOIS replacement, delivering normalized domain registration data across over 1,200 top-level domains. It offers a 7‑day free trial and paid plans starting at $9 per month, enabling easy integration of domain lookup capabilities into applications without parsing raw WHOIS text.

rdapapi-io publishes 7 API contracts indexed on the APIs.io network, including ASN API, Domain API, Entity API, and 4 more. Tagged areas include Company, RDAP, Domain, API, and Whois.

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

rdapapi-io’s developer surface includes changelog, authentication, documentation, API reference, getting-started guide, support, engineering blog, and 27 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

72.3/100 exemplar Agent 59/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 Agent Skills

Company RDAP DomainAPIWhois

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 72.3/100 · exemplar

Contract Quality 13.9 / 21

Developer Ergonomics 10.4 / 17

Access Clarity 12.4 / 17

Operational Transparency 7.8 / 11

Contract Governance 8.1 / 10

Discoverability 5.6 / 9

Regulatory Posture 6.0 / 15

Agent readiness — 59/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/rdapapi-io/"><img src="https://apis.io/badge/rdapapi-io/card.svg" alt="rdapapi-io on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Pagination +5 pts — share of collection GETs (an array, or one wrapped in data/items/results ...) that declare a page/limit/offset/cursor parameter, a Link header or a next/cursor field; na with no collection GETs
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 65.4 — up to +8.7 composite points
Developer Ergonomics scores 61.2 — up to +7.8 composite points
Access Clarity scores 73.2 — up to +5.4 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/rdapapi-io/apis.yml: open an issue on github.com/api-evangelist/rdapapi-io 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 →

APIs 7

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

rdapapi-io ASN API

Look up an Autonomous System Number.

rdapapi-io Domain API

Look up one domain, or up to 10 in a single call with the bulk endpoint.

rdapapi-io Entity API

Look up a contact or organization by RDAP handle.

rdapapi-io Health API

Uptime checks.

rdapapi-io IP API

Look up an IP address or CIDR block.

rdapapi-io Nameserver API

Look up a nameserver host record, for the registries that publish one.

rdapapi-io TLDs API

Check which TLDs are supported, in bulk or one at a time.

Scroll for all 7

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

rdapapi-io-main

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Rdapapi Io Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rdapapi Io Rate Limits

3 limits

RATE LIMITS

Semantic Vocabularies 1

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

Rdapapi Io Context

21 classes · 75 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

rdapapi-io API Rules

18 rules · 15 errors 1 warnings 2 info

SPECTRAL

JSON Schema 6

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

AsnResponse

13 properties

JSON SCHEMA

DomainResponse

11 properties

JSON SCHEMA

EntityResponse

19 properties

JSON SCHEMA

IpResponse

17 properties

JSON SCHEMA

NameserverResponse

9 properties

JSON SCHEMA

TldEntry

7 properties

JSON SCHEMA

Security Posture 3

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

Rdapapi Io Authentication

1 scheme

SECURITY

Rdapapi Io Domain Security

TLSv1.3 · DMARC

SECURITY

Rdapapi Io Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Rdapapi Io Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Rdapapi Io Agentic Access

9 operations · 1 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Lifecycle

ErrorCatalog

Conformance

Scroll for all 7

Build 2

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

Access & Security 5

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

RateLimits

ChangeLog

StatusPage

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: rdapapi-io
name: rdapapi-io
description: RDAP API provides developers with a modern, JSON-native WHOIS replacement, delivering normalized domain registration
  data across over 1,200 top-level domains. It offers a 7‑day free trial and paid plans starting at $9 per month, enabling
  easy integration of domain lookup capabilities into applications without parsing raw WHOIS text.
url: https://artifacts.apis.io/rdapapi-io/apis.yml
image: https://rdapapi.io/og-image.jpg
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Company
- RDAP
- Domain
- API
- Whois
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/rdapapi-io-agentic-access.yml
- type: RateLimits
  url: rate-limits/rdapapi-io-rate-limits.yml
- type: Plans
  url: plans/rdapapi-io-plans-pricing.yml
- type: Spectral
  url: rules/rdapapi-io-rules.yml
- type: JSONLD
  url: json-ld/rdapapi-io-context.jsonld
- type: Vocabulary
  url: vocabulary/rdapapi-io-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/rdapapi-io-data-model.yml
- type: ChangeLog
  url: changelog/rdapapi-io-changelog.yml
- type: Security
  url: https://rdapapi.io/toms
- type: Authentication
  url: authentication/rdapapi-io-authentication.yml
- type: Lifecycle
  url: lifecycle/rdapapi-io-lifecycle.yml
- type: ErrorCatalog
  url: errors/rdapapi-io-problem-types.yml
- type: Conformance
  url: conformance/rdapapi-io-conformance.yml
- type: LLMsTxt
  url: llms/rdapapi-io-llms.txt
- type: SecurityTxt
  url: well-known/rdapapi-io-security.txt
- type: WellKnown
  url: well-known/rdapapi-io-well-known.yml
- type: Hosts
  url: hosts/rdapapi-io-hosts.yml
- type: Vendors
  url: vendors/rdapapi-io-vendors.yml
- type: Packages
  url: packages/rdapapi-io-packages.yml
- type: StatusPage
  url: https://status.rdapapi.io
- type: SDKs
  url: https://rdapapi.io/sdks
- type: VulnerabilityDisclosure
  url: security/rdapapi-io-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/rdapapi-io-domain-security.yml
- type: Website
  url: https://rdapapi.io/
- type: Documentation
  url: https://rdapapi.io/docs
- type: APIReference
  url: https://rdapapi.io/docs
- type: GettingStarted
  url: https://rdapapi.io/docs
- type: Support
  url: https://rdapapi.io/contact
- type: Blog
  url: https://rdapapi.io/blog
- type: Pricing
  url: https://rdapapi.io/pricing
- type: TermsOfService
  url: https://rdapapi.io/terms
- type: PrivacyPolicy
  url: https://rdapapi.io/privacy
- type: SignUp
  url: https://rdapapi.io/register
apis:
- aid: rdapapi-io:rdapapi-io-asn-api
  name: rdapapi-io ASN API
  description: Look up an Autonomous System Number.
  humanURL: https://rdapapi.io/docs
  baseURL: https://rdapapi.io/api/v1
  tags:
  - ASN
  properties:
  - type: OpenAPI
    url: openapi/rdapapi-io-asn-api-openapi.yml
  - type: JSONSchema
    url: json-schema/rdapapi-io-entity-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-ip-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-domain-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-asn-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-tld-entry-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-nameserver-response-schema.json
- aid: rdapapi-io:rdapapi-io-domain-api
  name: rdapapi-io Domain API
  description: Look up one domain, or up to 10 in a single call with the bulk endpoint.
  humanURL: https://rdapapi.io/docs
  baseURL: https://rdapapi.io/api/v1
  tags:
  - Domain
  properties:
  - type: OpenAPI
    url: openapi/rdapapi-io-domain-api-openapi.yml
  - type: JSONSchema
    url: json-schema/rdapapi-io-entity-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-ip-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-domain-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-asn-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-tld-entry-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-nameserver-response-schema.json
- aid: rdapapi-io:rdapapi-io-entity-api
  name: rdapapi-io Entity API
  description: Look up a contact or organization by RDAP handle.
  humanURL: https://rdapapi.io/docs
  baseURL: https://rdapapi.io/api/v1
  tags:
  - Entity
  properties:
  - type: OpenAPI
    url: openapi/rdapapi-io-entity-api-openapi.yml
  - type: JSONSchema
    url: json-schema/rdapapi-io-entity-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-ip-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-domain-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-asn-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-tld-entry-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-nameserver-response-schema.json
- aid: rdapapi-io:rdapapi-io-health-api
  name: rdapapi-io Health API
  description: Uptime checks.
  humanURL: https://rdapapi.io/docs
  baseURL: https://rdapapi.io/api/v1
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/rdapapi-io-health-api-openapi.yml
  - type: JSONSchema
    url: json-schema/rdapapi-io-entity-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-ip-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-domain-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-asn-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-tld-entry-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-nameserver-response-schema.json
- aid: rdapapi-io:rdapapi-io-ip-api
  name: rdapapi-io IP API
  description: Look up an IP address or CIDR block.
  humanURL: https://rdapapi.io/docs
  baseURL: https://rdapapi.io/api/v1
  tags:
  - IP
  properties:
  - type: OpenAPI
    url: openapi/rdapapi-io-ip-api-openapi.yml
  - type: JSONSchema
    url: json-schema/rdapapi-io-entity-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-ip-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-domain-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-asn-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-tld-entry-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-nameserver-response-schema.json
- aid: rdapapi-io:rdapapi-io-nameserver-api
  name: rdapapi-io Nameserver API
  description: Look up a nameserver host record, for the registries that publish one.
  humanURL: https://rdapapi.io/docs
  baseURL: https://rdapapi.io/api/v1
  tags:
  - Nameserver
  properties:
  - type: OpenAPI
    url: openapi/rdapapi-io-nameserver-api-openapi.yml
  - type: JSONSchema
    url: json-schema/rdapapi-io-entity-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-ip-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-domain-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-asn-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-tld-entry-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-nameserver-response-schema.json
- aid: rdapapi-io:rdapapi-io-tlds-api
  name: rdapapi-io TLDs API
  description: Check which TLDs are supported, in bulk or one at a time.
  humanURL: https://rdapapi.io/docs
  baseURL: https://rdapapi.io/api/v1
  tags:
  - TLDs
  properties:
  - type: OpenAPI
    url: openapi/rdapapi-io-tlds-api-openapi.yml
  - type: JSONSchema
    url: json-schema/rdapapi-io-entity-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-ip-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-domain-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-asn-response-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-tld-entry-schema.json
  - type: JSONSchema
    url: json-schema/rdapapi-io-nameserver-response-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 40
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

rdapapi-io — frequently asked questions

Does rdapapi-io have an API?

Yes. APIs.io lists 7 APIs from rdapapi-io, including rdapapi-io ASN API, rdapapi-io Domain API and rdapapi-io Entity API, and 4 more.

Is there an OpenAPI specification for the rdapapi-io?

Yes. APIs.io indexes 7 OpenAPI specifications for rdapapi-io, each linked for download from this page.

How do I authenticate with the rdapapi-io?

rdapapi-io documents its authentication (1 scheme). The details are profiled on APIs.io as Rdapapi Io Authentication.

How much does the rdapapi-io cost?

APIs.io lists 3 pricing plans for rdapapi-io, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the rdapapi-io ready for AI agents?

rdapapi-io has a Kin Score of 72.3 out of 100 (exemplar) and an Agent Readiness score of 59.1 (agent-ready), scored by API Evangelist on 2026-10-31.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
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.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/rdapapi-io"

All providers

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

Every operation they expose

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

How their score was established

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

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.