Currencylayer
Currencylayer is a real-time and historical foreign exchange rate JSON API delivering bank-grade exchange rate data for 168 world currencies and precious metals, sourced from 15+ commercial-grade providers. The service is delivered through the APILayer marketplace under a freemium subscription model with refresh cadence ranging from hourly on Free up to 60 seconds on Enterprise tiers.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Currencylayer the way a machine reads it — 72 machine-readable artifacts across 5 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Currencylayer scores 60.0/100 (strong), with a separate agent-readiness read of 31/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
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How we profile Currencylayer
Each block below is one kind of artifact we hold for Currencylayer. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 5
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Currencylayer Change API
Currency change (margin and percentage) analysis between two dates.
Currencylayer Conversion API
On-demand currency amount conversion.
Currencylayer Rates API
Real-time and historical foreign exchange rate operations.
Currencylayer Symbols API
Discovery of supported currency symbols.
Currencylayer Time Frame API
Daily historical rates between two dates.
Postman Collections 5
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Currencylayer Change API
POSTMANOpen Collections 7
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONCurrencylayer Change API
OPEN COLLECTIONCurrencylayer Change Conversion API
OPEN COLLECTIONCurrencylayer Change Rates API
OPEN COLLECTIONCurrencylayer Change Symbols API
OPEN COLLECTIONCurrencylayer Change Time Frame API
OPEN COLLECTIONCurrencylayer API
OPEN COLLECTIONScroll within the panel for all 7 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Currencylayer Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Currencylayer Finops
FINOPSFeatures 10
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
168 World Currencies
Coverage of fiat currencies plus precious metals, sourced from 15+ commercial-grade providers.
Real-Time Exchange Rates
Latest rates with refresh cadence ranging from hourly (Free) to 60 seconds (Enterprise and above).
Historical Exchange Rates
End-of-day rates for any day since 1999, available on every plan including Free.
Currency Conversion Endpoint
On-demand conversion between any two currencies at real-time or historical rates.
Time-Frame Endpoint
Daily rates between two arbitrary dates (max 365 days) for trend analysis.
Change Endpoint
Start rate, end rate, absolute change, and percentage change for a chosen window.
HTTPS Encryption
SSL-secured transport on Basic plan and above; Free is HTTP only.
Source Currency Switching
Choose any of the 168 codes as the base currency on Basic plan and above.
APILayer Unified Auth
One APILayer `apikey` works across Currencylayer and other APILayer marketplace APIs.
Bank-Grade Data Sourcing
Aggregated from 15+ commercial-grade providers, suitable for finance and treasury workloads.
Scroll within the panel for all 10 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Currencylayer Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Currencylayer API Rules
SPECTRALCurrencylayer API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
Currencylayer Change Response
JSON SCHEMACurrencylayer Convert Response
JSON SCHEMACurrencylayer Currencies Response
JSON SCHEMACurrencylayer Error Response
JSON SCHEMACurrencylayer Quotes Response
JSON SCHEMACurrencylayer Time-Frame Response
JSON SCHEMAJSON Structure 5
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Currencylayer Change Structure
JSON STRUCTURECurrencylayer Convert Structure
JSON STRUCTURECurrencylayer Currencies Structure
JSON STRUCTURECurrencylayer Quotes Structure
JSON STRUCTURECurrencylayer Timeframe Structure
JSON STRUCTUREExamples 6
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 7
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
E-Commerce Multi-Currency Pricing
Convert prices into the shopper's local currency at checkout using /convert and /live.
Treasury and Cash Reporting
Daily mark-to-market of multi-currency balances using /timeframe and /change.
Travel and Fintech Apps
Power in-app FX widgets, traveler wallets, and remittance quotes with /live.
Accounting and Ledger Reconciliation
Look up the official end-of-day rate for any historical transaction with /historical.
Backtesting and Analytics
Pull windowed rate history with /timeframe to feed quant or BI models.
Compliance and Audit Trails
Reference an immutable end-of-day rate when auditing cross-border payments.
AI Agents and MCP Tools
Expose live and historical rates to LLM agents via APILayer's MCP server pattern.
Scroll within the panel for all 7 ·
Integrations 6
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
APILayer Marketplace
Currencylayer is distributed via the APILayer hub; signup, billing, and key management share the marketplace.
Fixer
Sister APILayer FX product with overlapping surface; commonly used interchangeably or for redundancy.
Coinlayer
Cryptocurrency exchange rate API on the same APILayer platform.
Open Exchange Rates
Competing FX API that consumers benchmark Currencylayer against.
Frankfurter / ExchangeRate.host
Free/community FX alternatives often evaluated alongside Currencylayer.
Money / money.js
Server- and browser-side libraries paired with Currencylayer for conversion math.
Solutions 6
Packaged solutions the provider offers on top of the raw API surface.
Packaged solutions this provider offers.
Free Plan
100 requests/month, hourly refresh, USD base only, HTTP only. Best for prototyping.
Basic Plan
10,000 requests/month at $14.99/mo, HTTPS, source-currency switching, /convert endpoint.
Professional Plan
100,000 requests/month at $39.99/mo, 10-minute refresh, /convert endpoint.
Enterprise Plan
100,000 requests/month at $59.99/mo, 60-second refresh, /timeframe endpoint.
Enterprise Plus Plan
500,000 requests/month at $99.99/mo, 60-second refresh, /timeframe and /change endpoints.
Custom Plan
Volume-based pricing, 60-second refresh, dedicated account team and priority support.
Resources
Every other property we hold for Currencylayer — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/currencylayer · machine-readable index on apis.io
This is an independent, third-party profile of Currencylayer, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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