Metals-API

Metals-API provides a free, simple, and lightweight JSON API for current and historical precious metals rates and currency conversion. It supports real-time and historical data for gold, silver, platinum, palladium, and other metals in 170 world currencies.

Metals-API publishes 4 API contracts indexed on the APIs.io network, including Analytics API, Conversion API, Rates API, and 1 more. Tagged areas include Currency, Financial Data, Gold, Precious Metals, and Silver.

The Metals-API catalog on APIs.io includes 1 Spectral governance ruleset.

Metals-API’s developer surface includes engineering blog, authentication, developer portal, pricing, signup flow, and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.7/100 thin ▬ flat Agent 23/100 agent aware Front door AI 3/6 light Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Currency Financial Data Gold Precious Metals Silver

Kin Score

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

Composite quality — 33.7/100 · thin

Contract Quality 10.0 / 21

Developer Ergonomics 7.7 / 17

Access Clarity 4.3 / 17

Operational Transparency 0.8 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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 4 / 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 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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 Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 25.5 — up to +14.9 composite points Ask about this →
Contract Quality scores 47.1 — up to +13.2 composite points Ask about this →
Operational Transparency scores 7.1 — up to +12.1 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/metals-api/apis.yml: open an issue on github.com/api-evangelist/metals-api 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 4

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

Metals-API Analytics API

Time series, fluctuation, and OHLC analytics.

Metals-API Conversion API

Currency and metal conversion endpoints.

Metals-API Rates API

Real-time and historical precious metals rates.

Metals-API Reference API

Symbols and reference data.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Metals Analytics API

OPEN COLLECTION

Metals Analytics Conversion API

OPEN COLLECTION

Metals Analytics Rates API

OPEN COLLECTION

Metals Analytics Reference API

OPEN COLLECTION

Metals-API

OPEN COLLECTION

Metals-API pricing

Not yet checked against Metals-API's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Metals-API's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Metals-API Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Metals-API Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Metals-API Finops

FINOPS

Spectral Rules 1

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

Metals-API API Rules

62 rules · 60 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Metals-API Authentication

apiKey · 1 scheme

SECURITY

Metals-API Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Metals-API Agentic Access

9 operations

9 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

Signup

Signup

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Pricing

Pricing

Company 3

The organization behind the API

Blog

Blog

Website

Website

LinkedIn

Source (apis.yml)

aid: metals-api
name: Metals-API
description: Metals-API provides a free, simple, and lightweight JSON API for current and historical precious metals rates
  and currency conversion. It supports real-time and historical data for gold, silver, platinum, palladium, and other metals
  in 170 world currencies.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/metals-api.png
tags:
- Currency
- Financial Data
- Gold
- Precious Metals
- Silver
url: https://raw.githubusercontent.com/api-evangelist/metals-api/refs/heads/main/apis.yml
created: '2025-03-01'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: metals-api:metals-api-analytics-api
  name: Metals-API Analytics API
  description: Time series, fluctuation, and OHLC analytics.
  humanURL: https://metals-api.com/
  baseURL: https://metals-api.com/api
  tags:
  - Analytics
  properties:
  - type: OpenAPI
    url: openapi/metals-api-analytics-api-openapi.yml
  - type: Documentation
    url: https://metals-api.com/documentation
  - type: GettingStarted
    url: https://metals-api.com/documentation#access_key
- aid: metals-api:metals-api-conversion-api
  name: Metals-API Conversion API
  description: Currency and metal conversion endpoints.
  humanURL: https://metals-api.com/
  baseURL: https://metals-api.com/api
  tags:
  - Conversion
  properties:
  - type: OpenAPI
    url: openapi/metals-api-conversion-api-openapi.yml
  - type: Documentation
    url: https://metals-api.com/documentation
  - type: GettingStarted
    url: https://metals-api.com/documentation#access_key
- aid: metals-api:metals-api-rates-api
  name: Metals-API Rates API
  description: Real-time and historical precious metals rates.
  humanURL: https://metals-api.com/
  baseURL: https://metals-api.com/api
  tags:
  - Rates
  properties:
  - type: OpenAPI
    url: openapi/metals-api-rates-api-openapi.yml
  - type: Documentation
    url: https://metals-api.com/documentation
  - type: GettingStarted
    url: https://metals-api.com/documentation#access_key
- aid: metals-api:metals-api-reference-api
  name: Metals-API Reference API
  description: Symbols and reference data.
  humanURL: https://metals-api.com/
  baseURL: https://metals-api.com/api
  tags:
  - Reference
  properties:
  - type: OpenAPI
    url: openapi/metals-api-reference-api-openapi.yml
  - type: Documentation
    url: https://metals-api.com/documentation
  - type: GettingStarted
    url: https://metals-api.com/documentation#access_key
common:
- type: Plans
  url: plans/metals-api-plans-pricing.yml
- type: RateLimits
  url: rate-limits/metals-api-rate-limits.yml
- type: FinOps
  url: finops/metals-api-finops.yml
- url: https://metals-api.com/blog
  type: Blog
- type: Website
  url: https://www.metals-api.com/
- type: AgenticAccess
  url: agentic-access/metals-api-agentic-access.yml
- type: DomainSecurity
  url: security/metals-api-domain-security.yml
- type: Authentication
  url: authentication/metals-api-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/zyla-labs
- type: Portal
  url: https://metals-api.com/
- type: Pricing
  url: https://metals-api.com/pricing
- type: Signup
  url: https://metals-api.com/signup
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Metals-API — frequently asked questions

Does Metals-API have an API?

Yes. APIs.io lists 4 APIs from Metals-API, including Metals-API Analytics API, Metals-API Conversion API and Metals-API Rates API, and 1 more.

Is there an OpenAPI specification for the Metals-API?

Yes. APIs.io indexes 4 OpenAPI specifications for Metals-API, each linked for download from this page.

How do I authenticate with the Metals-API?

Metals-API uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Metals-API Authentication.

How much does the Metals-API cost?

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

Is the Metals-API ready for AI agents?

Metals-API has a Kin Score of 33.7 out of 100 (thin) and an Agent Readiness score of 22.7 (agent-aware), scored by API Evangelist on 2026-11-13.

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