DomainCanary

domaincanary-com is a company surfaced via the API Evangelist harvest backlog (source: mcp-registry) and added to the network as a stub for full-pipeline profiling.

DomainCanary publishes 3 API contracts indexed on the APIs.io network, including C API, Spf Preflight API, and 1 more. Tagged areas include DMARC, Hosted SPF, Hosted MTA-STS, and MSP Tools.

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

DomainCanary’s developer surface includes pricing, documentation, getting-started guide, API reference, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

45.2/100 developing Agent 34/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract

DMARCHosted SPFHosted MTA-STSMSP Tools

Kin Score

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

Composite quality — 45.2/100 · developing

Contract Quality 12.1 / 21

Developer Ergonomics 6.0 / 17

Access Clarity 13.0 / 17

Operational Transparency 0.6 / 11

Contract Governance 2.2 / 10

Discoverability 4.1 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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)
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
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):

Developer Ergonomics scores 35.0 — up to +13.0 composite points
Operational Transparency scores 5.3 — up to +12.3 composite points
Contract Quality scores 57.1 — up to +10.7 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/domaincanary-com/apis.yml: open an issue on github.com/api-evangelist/domaincanary-com 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.

OpenAPI

measured — observed by APIs.io (published)

APIs 3

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

DomainCanary Free API

Check a domain's email authentication and test SPF changes, with no key.

DomainCanary C API

The C API from DomainCanary — 1 operation(s) for c.

DomainCanary Spf Preflight API

The Spf Preflight API from DomainCanary — 1 operation(s) for spf preflight.

DomainCanary API pricing

Prices published by DomainCanary, read 2026-11-05 from domaincanary.com/pricing.

Plan	Price
Free	$0
Starter	$19/month
Business	$49/month
Portfolio	$79/month
Enterprise	From $399 a month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Domaincanary Com Plans Pricing

5 plans

PLANS

Semantic Vocabularies 1

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

Domaincanary Com Context

6 classes · 22 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

DomainCanary API Rules

57 rules · 55 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Domaincanary Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Domaincanary Com Agentic Access

2 operations · 1 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

GettingStarted

GettingStarted

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 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: domaincanary-com
name: DomainCanary
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://domaincanary.com/card.png?v=3fd87df1
description: 'domaincanary-com is a company surfaced via the API Evangelist harvest backlog (source: mcp-registry) and added
  to the network as a stub for full-pipeline profiling.'
url: https://artifacts.apis.io/domaincanary-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-05 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-05'
modified: '2026-11-05'
tags:
- DMARC
- Hosted SPF
- Hosted MTA-STS
- MSP Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/domaincanary-com-agentic-access.yml
- type: Plans
  url: plans/domaincanary-com-plans-pricing.yml
- type: Spectral
  url: rules/domaincanary-com-rules.yml
- type: JSONLD
  url: json-ld/domaincanary-com-context.jsonld
- type: Vocabulary
  url: vocabulary/domaincanary-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/domaincanary-com-data-model.yml
- type: ErrorCatalog
  url: errors/domaincanary-com-problem-types.yml
- type: Conformance
  url: conformance/domaincanary-com-conformance.yml
- type: LLMsTxt
  url: llms/domaincanary-com-llms.txt
- type: WellKnown
  url: well-known/domaincanary-com-well-known.yml
- type: Hosts
  url: hosts/domaincanary-com-hosts.yml
- type: Vendors
  url: vendors/domaincanary-com-vendors.yml
- type: TermsOfService
  url: https://domaincanary.com/terms
- type: PrivacyPolicy
  url: https://domaincanary.com/privacy
- type: Pricing
  url: https://domaincanary.com/pricing
- type: Login
  url: https://domaincanary.com/login
- type: GitHubOrganization
  url: https://github.com/domaincanary
- type: Documentation
  url: https://domaincanary.com/guides
- type: GettingStarted
  url: https://domaincanary.com/guides/dmarc-setup
- type: APIReference
  url: https://domaincanary.com/llms.txt
- type: DomainSecurity
  url: security/domaincanary-com-domain-security.yml
- type: Website
  url: https://domaincanary.com/
apis:
- name: DomainCanary Free API
  description: Check a domain's email authentication and test SPF changes, with no key.
  humanURL: https://domaincanary.com/guides
  baseURL: https://domaincanary.com
  aid: domaincanary-com:domaincanary-free-api
- aid: domaincanary-com:domaincanary-com-c-api
  name: DomainCanary C API
  description: The C API from DomainCanary — 1 operation(s) for c.
  humanURL: https://domaincanary.com/guides
  baseURL: https://domaincanary.com
  tags:
  - C
  properties:
  - type: OpenAPI
    url: openapi/domaincanary-com-c-api-openapi.yml
- aid: domaincanary-com:domaincanary-com-spf-preflight-api
  name: DomainCanary Spf Preflight API
  description: The Spf Preflight API from DomainCanary — 1 operation(s) for spf preflight.
  humanURL: https://domaincanary.com/guides
  baseURL: https://domaincanary.com
  tags:
  - Spf Preflight
  properties:
  - type: OpenAPI
    url: openapi/domaincanary-com-spf-preflight-api-openapi.yml
x-enrichment:
  date: '2026-11-05'
  status: enriched
  artifacts_added: 22
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

DomainCanary API — frequently asked questions

Does DomainCanary have an API?

Yes. APIs.io lists 3 APIs from DomainCanary, including DomainCanary Free API, DomainCanary C API and DomainCanary Spf Preflight API.

Is there an OpenAPI specification for the DomainCanary API?

Yes. APIs.io indexes 2 OpenAPI specifications for DomainCanary, each linked for download from this page.

How much does the DomainCanary API cost?

DomainCanary publishes its prices; its Free plan is $0 as of 2026-11-05. APIs.io lists 5 pricing plans for DomainCanary, with each plan's price, limits and inclusions under Pricing on this page.

Is the DomainCanary API ready for AI agents?

DomainCanary has a Kin Score of 45.2 out of 100 (developing) and an Agent Readiness score of 33.8 (agent-ready), scored by API Evangelist on 2026-11-06.

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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.

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