Metal Sentinel

Metal Sentinel provides a fast REST API delivering free real-time and historical precious metal prices, including gold, silver, platinum, palladium, rhodium, copper, nickel, aluminum, lead and zinc across 180+ currencies, plus crypto, forex and mining stock quotes. The service offers tiered plans via RapidAPI and includes market news.

Metal Sentinel publishes 2 API contracts indexed on the APIs.io network, including API API, and 1 more. Tagged areas include Company, Financial Data, Metals, API, and Real-time.

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

Metal Sentinel’s developer surface includes documentation, pricing, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.2/100 thin Agent 24/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract

Company Financial Data MetalsAPIReal-time

Kin Score

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

Composite quality — 38.2/100 · thin

Contract Quality 13.2 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 8.9 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 0 / 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):

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
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)

10 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 11.9 — up to +17.6 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points
Contract Quality scores 62.2 — up to +9.5 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/metal-sentinel/apis.yml: open an issue on github.com/api-evangelist/metal-sentinel 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.

Metal Sentinel API

Real-time and historical precious metal prices, crypto, forex and mining stock data.

Metal Sentinel API API

Live spot quotes for ten metals refreshed every 15 seconds, daily historical series, gold karat and silver fineness prices, crypto and forex quotes, market status and mining equ...

Pricing Plans 1

Published pricing tiers and plan structures.

Metal Sentinel Plans Pricing

1 plans

PLANS

Semantic Vocabularies 1

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

Metal Sentinel Context

10 classes · 42 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Metal Sentinel API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

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

Equity

16 properties

JSON SCHEMA

Error

2 properties

JSON SCHEMA

ForexQuoteResponse

2 properties

JSON SCHEMA

GoldQuoteResponse

2 properties

JSON SCHEMA

HistoricalPointsResponse

9 properties

JSON SCHEMA

SilverQuoteResponse

2 properties

JSON SCHEMA

Security Posture 1

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

Metal Sentinel Domain Security

TLSv1.3

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Conformance

DataModel

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Contact

Contact

Commercial 4

Pricing, plans, and the legal terms of use

Plans

PrivacyPolicy

TermsOfService

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: metal-sentinel
name: Metal Sentinel
image: https://metal-sentinel.com/imgs/og-image.jpg
description: Metal Sentinel provides a fast REST API delivering free real-time and historical precious metal prices, including
  gold, silver, platinum, palladium, rhodium, copper, nickel, aluminum, lead and zinc across 180+ currencies, plus crypto,
  forex and mining stock quotes. The service offers tiered plans via RapidAPI and includes market news.
url: https://raw.githubusercontent.com/api-evangelist/metal-sentinel/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-24 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-24'
modified: '2026-10-24'
tags:
- Company
- Financial Data
- Metals
- API
- Real-time
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/metal-sentinel-rules.yml
- type: JSONLD
  url: json-ld/metal-sentinel-context.jsonld
- type: Vocabulary
  url: vocabulary/metal-sentinel-vocabulary.yml
- type: Conformance
  url: conformance/metal-sentinel-conformance.yml
- type: Plans
  url: plans/metal-sentinel-plans-pricing.yml
- type: DataModel
  url: data-model/metal-sentinel-data-model.yml
- type: LLMsTxt
  url: llms/metal-sentinel-llms.txt
- type: WellKnown
  url: well-known/metal-sentinel-well-known.yml
- type: Hosts
  url: hosts/metal-sentinel-hosts.yml
- type: PrivacyPolicy
  url: https://metal-sentinel.com/privacy-policy
- type: DomainSecurity
  url: security/metal-sentinel-domain-security.yml
- type: Website
  url: https://metal-sentinel.com
- type: Documentation
  url: https://metal-sentinel.com/endpoints
- type: TermsOfService
  url: https://metal-sentinel.com/terms
- type: Pricing
  url: https://metal-sentinel.com/pricing
- type: Blog
  url: https://metal-sentinel.com/blog
- type: Contact
  url: https://metal-sentinel.com/contact
apis:
- name: Metal Sentinel API
  description: Real-time and historical precious metal prices, crypto, forex and mining stock data.
  humanURL: https://metal-sentinel.com/endpoints
  baseURL: https://metal-sentinel.p.rapidapi.com
  aid: metal-sentinel:metal-sentinel-api
- aid: metal-sentinel:metal-sentinel-api-api
  name: Metal Sentinel API API
  description: 'Live spot quotes for ten metals refreshed every 15 seconds, daily historical series, gold karat and silver
    fineness prices, crypto

    and forex quotes, market status and mining equities. Subscribe on RapidAPI to get an API key; the free plan includes 7,500
    requests per month.'
  humanURL: https://metal-sentinel.com/openapi.json
  baseURL: https://metal-sentinel.p.rapidapi.com
  properties:
  - type: OpenAPI
    url: openapi/_original/metal-sentinel-api-openapi.json
  - type: JSONSchema
    url: json-schema/metal-sentinel-silver-quote-response-schema.json
  - type: JSONSchema
    url: json-schema/metal-sentinel-gold-quote-response-schema.json
  - type: JSONSchema
    url: json-schema/metal-sentinel-forex-quote-response-schema.json
  - type: JSONSchema
    url: json-schema/metal-sentinel-equity-schema.json
  - type: JSONSchema
    url: json-schema/metal-sentinel-historical-points-response-schema.json
  - type: JSONSchema
    url: json-schema/metal-sentinel-error-schema.json
x-submission-notes: OpenAPI 3.1, 12 ops; metal spot + historical prices; docs /endpoints
x-submitted-by: info@metal-sentinel.com (apis.io/add, 2026-10-24)
x-enrichment:
  date: '2026-10-24'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Metal Sentinel API — frequently asked questions

Does Metal Sentinel have an API?

Yes. APIs.io lists 2 APIs from Metal Sentinel, including Metal Sentinel API and Metal Sentinel API API.

Is there an OpenAPI specification for the Metal Sentinel API?

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

How do I authenticate with the Metal Sentinel API?

Metal Sentinel uses bearer-token authentication.

How much does the Metal Sentinel API cost?

APIs.io lists 1 pricing plan for Metal Sentinel, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Metal Sentinel API ready for AI agents?

Metal Sentinel has a Kin Score of 38.2 out of 100 (thin) and an Agent Readiness score of 24.1 (agent-aware), scored by API Evangelist on 2026-10-31.

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