databutler-dev

Data Butler provides official rates, thresholds, and reference data for AI agents across multiple jurisdictions such as the UK, US, Germany, and the EU. The service offers a REST API and an MCP endpoint for querying tax, social‑insurance, vehicle, and other official figures, each with source URLs, verified dates, and digital signatures. No accounts, cookies, or IP logging are used; only anonymous event counts are recorded. The site includes a changelog of verified facts, RSS/Atom feeds, and documentation at /api and llms.txt.

databutler-dev publishes 2 API contracts indexed on the APIs.io network. Tagged areas include Company, Data, API, Tax, and Reference.

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

databutler-dev’s developer surface includes signup flow and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

21.0/100 emerging Agent 21/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers 4 Agent Skills

Company DataAPITax Reference

Kin Score

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

Composite quality — 21.0/100 · emerging

Contract Quality 3.6 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 5.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.5 / 9

Regulatory Posture 4.3 / 15

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 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

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 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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 16.9 — up to +20.8 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 34.2 — up to +13.2 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/databutler-dev/apis.yml: open an issue on github.com/api-evangelist/databutler-dev 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 2

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

Data Butler API

Official facts and rates API providing verified data across multiple jurisdictions. No authentication required.

databutler-dev API

databutler-dev API as documented publicly: 58 operations. Contract generated from the documentation by API Evangelist (2026-10-29); not the provider's own document.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

databutler-dev MCP Server

Remote MCP server at databutler.dev.

MCP SERVER

Agent Skills 4

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

get-fact

AGENT SKILL

get-facts

AGENT SKILL

resolve-fact

AGENT SKILL

what-changed-since

AGENT SKILL

Semantic Vocabularies 1

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

Databutler Dev Context

1 classes · 1 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

databutler-dev API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

JSON Schema 1

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

PostApiStatsRequest

1 properties

JSON SCHEMA

Security Posture 2

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

Databutler Dev Authentication

0 schemes

SECURITY

Databutler Dev Domain Security

TLSv1.3 · HSTS

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Databutler Dev Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Databutler Dev Agentic Access

2 operations

2 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

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: databutler-dev
name: databutler-dev
description: Data Butler provides official rates, thresholds, and reference data for AI agents across multiple jurisdictions
  such as the UK, US, Germany, and the EU. The service offers a REST API and an MCP endpoint for querying tax, social‑insurance,
  vehicle, and other official figures, each with source URLs, verified dates, and digital signatures. No accounts, cookies,
  or IP logging are used; only anonymous event counts are recorded. The site includes a changelog of verified facts, RSS/Atom
  feeds, and documentation at /api and llms.txt.
url: https://artifacts.apis.io/databutler-dev/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
tags:
- Company
- Data
- API
- Tax
- Reference
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/databutler-dev-rules.yml
- type: JSONLD
  url: json-ld/databutler-dev-context.jsonld
- type: Vocabulary
  url: vocabulary/databutler-dev-vocabulary.yml
- type: DataModel
  url: data-model/databutler-dev-data-model.yml
- type: Conformance
  url: conformance/databutler-dev-conformance.yml
- type: LLMsTxt
  url: llms/databutler-dev-llms.txt
- type: MCPServer
  url: mcp/databutler-dev-mcp.yml
- type: Hosts
  url: hosts/databutler-dev-hosts.yml
- type: Vendors
  url: vendors/databutler-dev-vendors.yml
- type: TermsOfService
  url: https://databutler.dev/terms
- type: SignUp
  url: https://databutler.dev/f/uk/gov/register-birth/where
- type: PrivacyPolicy
  url: https://databutler.dev/privacy
- type: DomainSecurity
  url: security/databutler-dev-domain-security.yml
- type: Website
  url: https://databutler.dev/
apis:
- name: Data Butler API
  description: Official facts and rates API providing verified data across multiple jurisdictions. No authentication required.
  humanURL: https://databutler.dev/
  baseURL: https://databutler.dev
  aid: databutler-dev:data-butler-api
- aid: databutler-dev:databutler-dev-api
  name: databutler-dev API
  description: 'databutler-dev API as documented publicly: 58 operations. Contract generated from the documentation by API
    Evangelist (2026-10-29);

    not the provider''s own document.'
  humanURL: https://databutler.dev/api
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/databutler-dev-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/databutler-dev-post-api-stats-request-schema.json
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

databutler-dev API — frequently asked questions

Does databutler-dev have an API?

Yes. APIs.io lists 2 APIs from databutler-dev, including Data Butler API and databutler-dev API.

Is there an OpenAPI specification for the databutler-dev API?

Yes. APIs.io indexes 1 OpenAPI specification for databutler-dev, each linked for download from this page.

How do I authenticate with the databutler-dev API?

databutler-dev documents its authentication (0 schemes). The details are profiled on APIs.io as Databutler Dev Authentication.

Does databutler-dev have an MCP server?

Yes. APIs.io lists 1 MCP server for databutler-dev: Remote MCP server at databutler.dev.

Is the databutler-dev API ready for AI agents?

databutler-dev has a Kin Score of 21.0 out of 100 (emerging) and an Agent Readiness score of 21.4 (agent-aware), scored by API Evangelist on 2026-10-31.

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