Free Currency API

Free Currency API provides real-time and historical currency exchange rate data for 150+ currencies via a simple REST API. No registration is required for basic usage, making it ideal for hobby and development projects. The API offers daily-updated current exchange rates, historical rates dating back to 1999, and multi-currency support with official SDKs for JavaScript, Python, PHP, Go, Ruby, Rust, C#, and R.

Free Currency API publishes 2 API contracts indexed on the APIs.io network: Metadata API and Rates API. Tagged areas include Currency, Exchange Rates, Finance, Historical Data, and Free.

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

Free Currency API’s developer surface includes authentication, documentation, pricing, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

30.5/100 thin ▬ flat Agent 33/100 agent ready Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumOpen⚡ Free to try

1 published contract

Currency Exchange Rates Finance Historical Data Free

Kin Score

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

Composite quality — 30.5/100 · thin

Contract Quality 12.2 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 2.2 / 17

Operational Transparency 1.8 / 11

Contract Governance 1.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 33/100 · agent ready

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 7 / 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 →
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 →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

5 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 12.8 — up to +17.4 composite points Ask about this →
Developer Ergonomics scores 21.4 — up to +15.7 composite points Ask about this →
Operational Transparency scores 16.7 — up to +10.8 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.

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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/freecurrencyapi/apis.yml: open an issue on github.com/api-evangelist/freecurrencyapi 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 2

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

Free Currency API Metadata API

Supported currencies and account status.

Free Currency API Rates API

Latest and historical exchange rates.

Open Collections 3

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

Free Currency Currencies API

OPEN COLLECTION

Free Currency Currencies Exchange Rates API

OPEN COLLECTION

Free Currency Currencies Status API

OPEN COLLECTION

Free Currency API pricing

Not yet checked against Free Currency API's own pricing page. Compiled by API Evangelist on 2026-06-13; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free	Free
Commercial (currencyapi.com)	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Free Currency API Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Free Currency API Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Free Currency API Finops

FINOPS

Semantic Vocabularies 1

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

Freecurrencyapi Context

0 classes · 0 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.

Free Currency API — jsonschema rules

5 rules · 4 warn-severity 1 info-severity

SPECTRAL

JSON Schema 4

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

CurrenciesResponse

1 properties

JSON SCHEMA

ExchangeRatesResponse

1 properties

JSON SCHEMA

HistoricalRatesResponse

1 properties

JSON SCHEMA

StatusResponse

1 properties

JSON SCHEMA

Examples 4

Example request and response payloads for these APIs.

Get Currencies

4 fields

EXAMPLE

Get Historical Rates

4 fields

EXAMPLE

Get Latest Rates

4 fields

EXAMPLE

Get Status

4 fields

EXAMPLE

Security Posture 2

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

Free Currency API Authentication

apiKey · 2 schemes

SECURITY

Free Currency API Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Free Currency API Agentic Access

4 operations

4 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: freecurrencyapi
name: Free Currency API
description: Free Currency API provides real-time and historical currency exchange rate data for 150+ currencies via a simple
  REST API. No registration is required for basic usage, making it ideal for hobby and development projects. The API offers
  daily-updated current exchange rates, historical rates dating back to 1999, and multi-currency support with official SDKs
  for JavaScript, Python, PHP, Go, Ruby, Rust, C#, and R.
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: open
  trial: false
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Open access
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/freecurrencyapi.png
url: https://raw.githubusercontent.com/api-evangelist/freecurrencyapi/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Currency
- Exchange Rates
- Finance
- Historical Data
- Free
apis:
- aid: freecurrencyapi:freecurrencyapi-metadata-api
  name: Free Currency API Metadata API
  description: Supported currencies and account status.
  humanURL: https://freecurrencyapi.com/
  baseURL: https://api.freecurrencyapi.com/v1
  tags:
  - Metadata
  properties:
  - type: OpenAPI
    url: openapi/freecurrencyapi-metadata-api-openapi.yml
  - type: Documentation
    url: https://freecurrencyapi.com/docs
- aid: freecurrencyapi:freecurrencyapi-rates-api
  name: Free Currency API Rates API
  description: Latest and historical exchange rates.
  humanURL: https://freecurrencyapi.com/
  baseURL: https://api.freecurrencyapi.com/v1
  tags:
  - Rates
  properties:
  - type: OpenAPI
    url: openapi/freecurrencyapi-rates-api-openapi.yml
  - type: Documentation
    url: https://freecurrencyapi.com/docs
common:
- type: AgenticAccess
  url: agentic-access/freecurrencyapi-agentic-access.yml
- type: DomainSecurity
  url: security/freecurrencyapi-domain-security.yml
- type: Authentication
  url: authentication/freecurrencyapi-authentication.yml
- type: Website
  url: https://freecurrencyapi.com/
- type: Documentation
  url: https://freecurrencyapi.com/docs
- type: GitHubOrg
  url: https://github.com/everapihq
- type: Pricing
  url: https://freecurrencyapi.com/
- type: StatusPage
  url: https://api.freecurrencyapi.com/v1/status
- type: Plans
  url: https://raw.githubusercontent.com/api-evangelist/freecurrencyapi/refs/heads/main/plans/freecurrencyapi-plans-pricing.yml
- type: RateLimits
  url: https://raw.githubusercontent.com/api-evangelist/freecurrencyapi/refs/heads/main/rate-limits/freecurrencyapi-rate-limits.yml
- type: FinOps
  url: https://raw.githubusercontent.com/api-evangelist/freecurrencyapi/refs/heads/main/finops/freecurrencyapi-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Free Currency API — frequently asked questions

Does Free Currency API have an API?

Yes. APIs.io lists 2 APIs from Free Currency API, including Free Currency API Metadata API and Free Currency API Rates API.

Is there an OpenAPI specification for the Free Currency API?

Yes. APIs.io indexes 2 OpenAPI specifications for Free Currency API, each linked for download from this page.

How do I authenticate with the Free Currency API?

Free Currency API uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Free Currency API Authentication.

How much does the Free Currency API cost?

APIs.io lists 2 pricing plans for Free Currency API, with each plan's price, limits and inclusions under Pricing on this page.

Is the Free Currency API ready for AI agents?

Free Currency API has a Kin Score of 30.5 out of 100 (thin) and an Agent Readiness score of 33.3 (agent-ready), scored by API Evangelist on 2026-11-13.

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