Maryland Department of Assessments and Taxation

The Maryland Department of Assessments and Taxation (MDAT) is the state agency responsible for maintaining property and business records, assessing real‑property values, and providing a range of online services to Maryland residents, businesses, and government entities. It offers searchable databases for business entities, real‑property assessments, tax credits, and more, accessible through its public web portals and data services.

Maryland Department of Assessments and Taxation is listed with 1 API on the APIs.io network. Tagged areas include Government, Real Estate, Business Services, Data, and Maryland.

🌐 Visit website 📡 Profile data on GitHub

7.5/100 minimal Agent 0/100 human only Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API

Government Real Estate Business Services DataMaryland

Kin Score

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

Composite quality — 7.5/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.0 / 9

Regulatory Posture 1.5 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 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

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector 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
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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

13 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
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 10.5 — up to +17.9 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/maryland-department-of-assessments-and-taxation/apis.yml: open an issue on github.com/api-evangelist/maryland-department-of-assessments-and-taxation 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.

Maryland Department of Assessments and Taxation API

Provides public data services for property and business records via the Maryland DAT portal.

Security Posture 1

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

Maryland Department Of Assessments And Taxation Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Newsroom

Newsroom

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: maryland-department-of-assessments-and-taxation
name: Maryland Department of Assessments and Taxation
image: https://dat.maryland.gov/Style Library/egov/img/logo.png
description: The Maryland Department of Assessments and Taxation (MDAT) is the state agency responsible for maintaining property
  and business records, assessing real‑property values, and providing a range of online services to Maryland residents, businesses,
  and government entities. It offers searchable databases for business entities, real‑property assessments, tax credits, and
  more, accessible through its public web portals and data services.
url: https://raw.githubusercontent.com/api-evangelist/maryland-department-of-assessments-and-taxation/refs/heads/main/apis.yml
x-type: company
x-source: harvest:vc-portfolio
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-26 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-26'
modified: '2026-10-26'
tags:
- Government
- Real Estate
- Business Services
- Data
- Maryland
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: LLMsTxt
  url: llms/maryland-department-of-assessments-and-taxation-llms.txt
- type: Hosts
  url: hosts/maryland-department-of-assessments-and-taxation-hosts.yml
- type: Vendors
  url: vendors/maryland-department-of-assessments-and-taxation-vendors.yml
- type: PrivacyPolicy
  url: http://www.maryland.gov/pages/privacy_security.aspx
- type: Newsroom
  url: https://dat.maryland.gov/newsroom
- type: DomainSecurity
  url: security/maryland-department-of-assessments-and-taxation-domain-security.yml
- type: Website
  url: https://dat.maryland.gov/Pages/default.aspx
apis:
- name: Maryland Department of Assessments and Taxation API
  description: Provides public data services for property and business records via the Maryland DAT portal.
  humanURL: https://dat.maryland.gov/Pages/default.aspx
  baseURL: null
  aid: maryland-department-of-assessments-and-taxation:maryland-department-of-assessments-and-taxation-api
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The provider's documentation returns HTML pages for spec URLs (e.g., /openapi.json) with no machine‑readable OpenAPI
    definition.
  evidence:
  - url: https://dat.maryland.gov/openapi.json
    status: 200
  checked: '2026-10-26'
x-enrichment:
  date: '2026-10-26'
  status: enriched
  artifacts_added: 6
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Maryland Department of Assessments and Taxation API — frequently asked questions

Does Maryland Department of Assessments and Taxation have an API?

Yes. APIs.io lists 1 API from Maryland Department of Assessments and Taxation, including Maryland Department of Assessments and Taxation API.

Is the Maryland Department of Assessments and Taxation API ready for AI agents?

Maryland Department of Assessments and Taxation has a Kin Score of 7.5 out of 100 (minimal) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-10-31.

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