Hopi

Hopi provides a collection of free online calculators, converters, generators and tools covering topics such as percentages, VAT, take‑home pay, unit conversions, dates, colours, passwords and more. The site offers these utilities without requiring sign‑up, aiming to help users quickly perform common calculations and conversions directly in the browser.

Hopi is listed with 1 API on the APIs.io network. Tagged areas include Company, Tools, Calculators, Converters, and Utilities.

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

Hopi’s developer surface includes signup flow, documentation, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.0/100 emerging Agent 6/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 API 1 Agent Skills

Company Tools CalculatorsConvertersUtilities

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 25.0/100 · emerging

Contract Quality 3.0 / 21

Developer Ergonomics 2.7 / 17

Access Clarity 4.7 / 17

Operational Transparency 1.0 / 11

Contract Governance 2.2 / 10

Discoverability 6.7 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 6/100 · agent aware

Machine-Readable Contract 0 / 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 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

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Energy & Utilities 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 Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
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) Ask about this →
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) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 13.9 — up to +21.5 composite points Ask about this →
Developer Ergonomics scores 16.0 — up to +16.8 composite points Ask about this →
Access Clarity scores 27.7 — up to +14.5 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/hopi-co-uk/apis.yml: open an issue on github.com/api-evangelist/hopi-co-uk 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.

Hopi API

Public, key‑free API exposing live foreign‑exchange reference rates.

Agent Skills 1

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

get-exchange-rates

AGENT SKILL

Semantic Vocabularies 1

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

Hopi Co Uk Context

1 classes · 3 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Hopi API Rules

34 rules · 32 error-severity 1 warn-severity 1 info-severity

SPECTRAL

JSON Schema 1

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

Rates

3 properties

JSON SCHEMA

Security Posture 2

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

Hopi Domain Security

TLSv1.3 · HSTS · DNSSEC

SECURITY

Hopi Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Hopi Agentic Access

1 operation

1 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

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

Access & Security 4

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

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: hopi-co-uk
name: Hopi
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://hopi.co.uk/og.png
description: Hopi provides a collection of free online calculators, converters, generators and tools covering topics such
  as percentages, VAT, take‑home pay, unit conversions, dates, colours, passwords and more. The site offers these utilities
  without requiring sign‑up, aiming to help users quickly perform common calculations and conversions directly in the browser.
url: https://artifacts.apis.io/hopi-co-uk/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-11 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-11'
modified: '2026-11-11'
tags:
- Company
- Tools
- Calculators
- Converters
- Utilities
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/hopi-co-uk-agentic-access.yml
- type: Spectral
  url: rules/hopi-co-uk-rules.yml
- type: JSONLD
  url: json-ld/hopi-co-uk-context.jsonld
- type: Vocabulary
  url: vocabulary/hopi-co-uk-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/hopi-co-uk-data-model.yml
- type: Security
  url: security/hopi-co-uk-vulnerability-disclosure.yml
- type: ErrorCatalog
  url: errors/hopi-co-uk-problem-types.yml
- type: Conformance
  url: conformance/hopi-co-uk-conformance.yml
- type: LLMsTxt
  url: llms/hopi-co-uk-llms.txt
- type: SecurityTxt
  url: well-known/hopi-co-uk-security.txt
- type: WellKnown
  url: well-known/hopi-co-uk-well-known.yml
- type: Hosts
  url: hosts/hopi-co-uk-hosts.yml
- type: Vendors
  url: vendors/hopi-co-uk-vendors.yml
- type: TermsOfService
  url: https://hopi.co.uk/terms/
- type: SignUp
  url: https://hopi.co.uk/news/register-self-assessment-5-october-2026/
- type: PrivacyPolicy
  url: https://hopi.co.uk/privacy/
- type: Newsroom
  url: https://hopi.co.uk/news/
- type: VulnerabilityDisclosure
  url: security/hopi-co-uk-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/hopi-co-uk-domain-security.yml
- type: Website
  url: https://hopi.co.uk/
- type: Documentation
  url: https://hopi.co.uk/tools/
apis:
- name: Hopi API
  description: Public, key‑free API exposing live foreign‑exchange reference rates.
  humanURL: https://hopi.co.uk/openapi.json
  baseURL: https://hopi.co.uk
  properties:
  - type: JSONSchema
    url: json-schema/hopi-co-uk-rates-schema.json
  aid: hopi-co-uk:hopi-api
x-enrichment:
  date: '2026-11-11'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Hopi API — frequently asked questions

Does Hopi have an API?

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

Is the Hopi API ready for AI agents?

Hopi has a Kin Score of 25.0 out of 100 (emerging) and an Agent Readiness score of 5.8 (agent-aware), scored by API Evangelist on 2026-11-13.

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.

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