Spamhaus

Spamhaus is an international non‑profit organization that tracks email spam and related cyber‑threats. It operates globally recognized blocklists such as the DNSBL, provides reputation data, and offers tools and services to help ISPs, email providers, and security teams protect their networks from spam, phishing, and malware. Through its research and data services, Spamhaus strengthens trust and safety across the internet.

Spamhaus is listed with 1 API on the APIs.io network. Tagged areas include Company, Security, Anti-Spam, Reputation, and DNSBL.

Spamhaus’ developer surface includes documentation, getting-started guide, support, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

18.4/100 emerging Agent 6/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API

Company Security Anti-Spam ReputationDNSBL

Kin Score

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

Composite quality — 18.4/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 6.5 / 17

Access Clarity 3.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.0 / 10

Discoverability 4.6 / 9

Regulatory Posture 2.1 / 15

Agent readiness — 6/100 · agent aware

Machine-Readable Contract 0 / 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 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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

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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 21.1 — up to +15.8 composite points
Developer Ergonomics scores 38.1 — up to +12.4 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/spamhaus/apis.yml: open an issue on github.com/api-evangelist/spamhaus 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 1

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

Spamhaus API

Spamhaus provides blocklist lookup services; API details are not publicly documented.

Security Posture 1

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

Spamhaus Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Access & Security 2

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

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: spamhaus
name: Spamhaus
description: Spamhaus is an international non‑profit organization that tracks email spam and related cyber‑threats. It operates
  globally recognized blocklists such as the DNSBL, provides reputation data, and offers tools and services to help ISPs,
  email providers, and security teams protect their networks from spam, phishing, and malware. Through its research and data
  services, Spamhaus strengthens trust and safety across the internet.
url: https://raw.githubusercontent.com/api-evangelist/spamhaus/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
tags:
- Company
- Security
- Anti-Spam
- Reputation
- DNSBL
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: SecurityTxt
  url: well-known/spamhaus-security.txt
- type: WellKnown
  url: well-known/spamhaus-well-known.yml
- type: Hosts
  url: hosts/spamhaus-hosts.yml
- type: Vendors
  url: vendors/spamhaus-vendors.yml
- type: TermsOfService
  url: https://www.spamhaus.org/terms-conditions/
- type: PrivacyPolicy
  url: https://www.spamhaus.org/privacy-notice/
- type: DomainSecurity
  url: security/spamhaus-domain-security.yml
- type: Website
  url: https://spamhaus.org/
- type: DeveloperPortal
  url: https://www.spamhaus.org/
- type: Documentation
  url: https://www.spamhaus.org/resource-hub/
- type: GettingStarted
  url: https://www.spamhaus.org/about-the-research/
- type: Support
  url: https://www.spamhaus.org/faqs/
- type: Blog
  url: https://www.spamhaus.org/events/
apis:
- name: Spamhaus API
  description: Spamhaus provides blocklist lookup services; API details are not publicly documented.
  humanURL: https://portal.spamhaus.org/
  baseURL: null
  aid: spamhaus:spamhaus-api
x-submission-probe: 301 https://www.spamhaus.org/, 2026-10-26
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 8
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Spamhaus API — frequently asked questions

Does Spamhaus have an API?

Yes. APIs.io lists 1 API from Spamhaus, including Spamhaus API.

Is the Spamhaus API ready for AI agents?

Spamhaus has a Kin Score of 18.4 out of 100 (emerging) and an Agent Readiness score of 6.0 (agent-aware), scored by API Evangelist on 2026-10-31.

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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.

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Call it yourself

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This provider

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Every operation they expose

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

How their score was established

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

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