Carat Hunter

Carat Hunter is an independent diamond price-comparison site built by Digital Adventures. It matches the same certified diamond (GIA, IGI and other lab reports) across 100+ retailers worldwide, covering some 11.6 million certified natural and lab-grown diamonds, and shows the price range, retailer count and its Caratlytics value score. It sells no diamonds and takes no commission. It offers natural-language and visual search, an AI diamond expert (Lucy), certificate decoders, mobile apps, and a published llms.txt and public OpenAPI description for aggregate stats, diamond summaries, glossary and market-pulse data.

Carat Hunter publishes 1 API contract indexed on the APIs.io network: Public API. Tagged areas include Company, Diamonds, Jewelry, Price Comparison, and Retail.

The Carat Hunter catalog on APIs.io includes 1 Spectral governance ruleset.

Carat Hunter’s developer surface includes documentation, engineering blog, pricing, support, and 25 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

30.4/100 thin Agent 25/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 MCP Servers 3 Agent Skills

Company Diamonds Jewelry Price Comparison Retail E-Commerce Market DataAI

Kin Score

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

Composite quality — 30.4/100 · thin

Contract Quality 5.1 / 21

Developer Ergonomics 1.4 / 17

Access Clarity 7.5 / 17

Operational Transparency 2.1 / 11

Contract Governance 5.0 / 10

Discoverability 6.2 / 9

Regulatory Posture 1.3 / 15

Agent readiness — 25/100 · agent aware

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 0 / 8

Request/Response Examples 0 / 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 Securities & Market Data 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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
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 24.0 — up to +19.0 composite points
Developer Ergonomics scores 8.3 — up to +18.3 composite points
Access Clarity scores 44.2 — up to +11.2 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/carathunter-com/apis.yml: open an issue on github.com/api-evangelist/carathunter-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 1

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

Carat Hunter Public API

The Public API from Carat Hunter — 7 operation(s) for public.

MCP Servers 1

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

Carat Hunter MCP Server

Remote MCP server at carathunter.com over streamable HTTP; 5 tools listed.

MCP SERVER

Agent Skills 3

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

check-a-diamond

AGENT SKILL

price-a-diamond-spec

AGENT SKILL

weekly-market-report

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Carathunter Com Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Carathunter Com Rate Limits

2 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Carat Hunter API Rules

49 rules · 47 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Carathunter Com Openapi Overlay

12 actions · documentation · carathunter-com-openapi.yml

DERIVED

Security Posture 3

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

Carathunter Com Authentication

0 schemes

SECURITY

Carathunter Com Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Carathunter Com Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Carathunter Com Agentic Access

7 operations · 1 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

Conventions

Lifecycle

ErrorCatalog

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 4

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

About

About

Other 3

Properties that don't map to a standard resource type

Overlay

Overlay

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: carathunter-com
name: Carat Hunter
description: Carat Hunter is an independent diamond price-comparison site built by Digital Adventures. It matches the same
  certified diamond (GIA, IGI and other lab reports) across 100+ retailers worldwide, covering some 11.6 million certified
  natural and lab-grown diamonds, and shows the price range, retailer count and its Caratlytics value score. It sells no diamonds
  and takes no commission. It offers natural-language and visual search, an AI diamond expert (Lucy), certificate decoders,
  mobile apps, and a published llms.txt and public OpenAPI description for aggregate stats, diamond summaries, glossary and
  market-pulse data.
url: https://artifacts.apis.io/carathunter-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- Diamonds
- Jewelry
- Price Comparison
- Retail
- E-Commerce
- Market Data
- AI
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://carathunter.com/og-image.png
common:
- type: AgenticAccess
  url: agentic-access/carathunter-com-agentic-access.yml
- type: RateLimits
  url: rate-limits/carathunter-com-rate-limits.yml
- type: Plans
  url: plans/carathunter-com-plans-pricing.yml
- type: Spectral
  url: rules/carathunter-com-rules.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Conventions
  url: conventions/carathunter-com-conventions.yml
- type: Security
  url: security/carathunter-com-vulnerability-disclosure.yml
- type: Lifecycle
  url: lifecycle/carathunter-com-lifecycle.yml
- type: ErrorCatalog
  url: errors/carathunter-com-problem-types.yml
- type: Conformance
  url: conformance/carathunter-com-conformance.yml
- type: Overlay
  url: overlays/carathunter-com-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/carathunter-com-llms.txt
- type: ToolCrosswalk
  url: mcp/carathunter-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/carathunter-com-mcp.yml
- type: SecurityTxt
  url: well-known/carathunter-com-security.txt
- type: WellKnown
  url: well-known/carathunter-com-well-known.yml
- type: Hosts
  url: hosts/carathunter-com-hosts.yml
- type: Vendors
  url: vendors/carathunter-com-vendors.yml
- type: Documentation
  url: https://carathunter.com/us/insights/guides/under-50000
- type: VulnerabilityDisclosure
  url: security/carathunter-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/carathunter-com-domain-security.yml
- type: Website
  url: https://carathunter.com/
- type: Blog
  url: https://carathunter.com/us/insights/blog
- type: Pricing
  url: https://carathunter.com/us/pricing
- type: Support
  url: https://carathunter.com/us/contact
- type: About
  url: https://carathunter.com/us/about
- type: TermsOfService
  url: https://carathunter.com/terms
- type: PrivacyPolicy
  url: https://carathunter.com/privacy
- type: LLMsTxt
  url: https://carathunter.com/llms.txt
apis:
- aid: carathunter-com:carathunter-com-public-api
  name: Carat Hunter Public API
  description: The Public API from Carat Hunter — 7 operation(s) for public.
  humanURL: https://carathunter.com/llms.txt
  baseURL: https://carathunter.com/api/proxy
  tags:
  - Public
  properties:
  - type: OpenAPI
    url: openapi/carathunter-com-public-api-openapi.yml
x-coverage:
  state: covered
  reason: identity-verified
  detail: Name, description and pointers read from carathunter.com (title "Carat Hunter, Diamond Price Comparison Across 100+
    Retailers", footer "© 2026 Carat Hunter Built by Digital Adventures"); preflight 403s were crawler-UA only, all pages
    200 with browser UA.
  evidence:
  - url: https://carathunter.com/
    status: 200
  - url: https://carathunter.com/us/insights/blog
    status: 200
  - url: https://carathunter.com/us/pricing
    status: 200
  - url: https://carathunter.com/us/contact
    status: 200
  - url: https://carathunter.com/us/about
    status: 200
  - url: https://carathunter.com/terms
    status: 200
  - url: https://carathunter.com/privacy
    status: 200
  - url: https://carathunter.com/llms.txt
    status: 200
  - url: https://carathunter.com/og-image.png
    status: 200
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 34
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

Carat Hunter API — frequently asked questions

Does Carat Hunter have an API?

Yes. APIs.io lists 1 API from Carat Hunter, including Carat Hunter Public API.

Is there an OpenAPI specification for the Carat Hunter API?

Yes. APIs.io indexes 1 OpenAPI specification for Carat Hunter, each linked for download from this page.

How do I authenticate with the Carat Hunter API?

Carat Hunter documents its authentication (0 schemes). The details are profiled on APIs.io as Carathunter Com Authentication.

How much does the Carat Hunter API cost?

APIs.io lists 3 pricing plans for Carat Hunter, with each plan's price, limits and inclusions under Pricing on this page.

Does Carat Hunter have an MCP server?

Yes. APIs.io lists 1 MCP server for Carat Hunter: Remote MCP server at carathunter.com over streamable HTTP; 5 tools listed.

Is the Carat Hunter API ready for AI agents?

Carat Hunter has a Kin Score of 30.4 out of 100 (thin) and an Agent Readiness score of 25.2 (agent-aware), scored by API Evangelist on 2026-11-06.

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