Fixer
Fixer is a lightweight JSON API for real-time and historical foreign exchange rates and currency conversion. Built on top of European Central Bank reference rates and 15+ additional data sources, Fixer supports 170+ world currencies and is delivered through the APILayer marketplace under a freemium subscription model.
Fixer publishes 5 APIs on the APIs.io network, including Conversion API, Fluctuation API, Rates API, and 2 more. Tagged areas include Currency Exchange, Foreign Exchange, FX, Forex, and ECB.
The Fixer catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.
Fixer’s developer surface includes authentication, documentation, API reference, pricing, signup flow, support, engineering blog, and 15 more developer resources.
Kin Score
APIs 5
Individual APIs this provider publishes, each with its own machine-readable definition.
Fixer Conversion API
On-demand currency amount conversion.
Fixer Fluctuation API
Currency fluctuation analysis between two dates.
Fixer Rates API
Real-time and historical foreign exchange rate operations.
Fixer Symbols API
Discovery of supported currency symbols.
Fixer Time Series API
Daily historical rates between two dates.
Postman Collections 5
Ready-to-run Postman collections for exercising this provider's APIs.
Open Collections 1
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Fixer API
OPEN COLLECTIONPricing Plans 1
Published pricing tiers and plan structures.
Fixer Plans Pricing
PLANSRate Limits 1
Documented rate limits and quota policies.
Fixer Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Fixer Finops
FINOPSFeatures 9
Notable capabilities this provider offers.
170+ World Currencies
Coverage of fiat currencies, sourced from the European Central Bank and 15+ additional providers.
Real-Time Exchange Rates
Latest rates with refresh cadence ranging from hourly (Free) to 60 seconds (Professional Plus, Enterprise).
Historical Exchange Rates
End-of-day rates for any working day since 1999-01-04, available on every plan including Free.
Currency Conversion Endpoint
On-demand conversion between any two currencies at real-time or historical rates.
Time Series Endpoint
Daily rates between two arbitrary dates (max 365 days) for trend analysis.
Fluctuation 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 170+ symbols as the base currency on Basic plan and above.
APILayer Unified Auth
One APILayer `apikey` works across Fixer and other APILayer marketplace APIs.
Scroll for all 9
Semantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Fixer Context
JSON-LDSpectral Rules 2
Spectral governance rulesets for linting and validating these APIs.
Fixer API Rules
SPECTRALFixer API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions for this provider's data models.
Fixer Convert Response
JSON SCHEMAFixer Error Response
JSON SCHEMAFixer Fluctuation Response
JSON SCHEMAFixer Rates Response
JSON SCHEMAFixer Symbols Response
JSON SCHEMAFixer Time Series Response
JSON SCHEMAJSON Structure 5
JSON Structure definitions describing this provider's data shapes.
Fixer Convert Structure
JSON STRUCTUREFixer Fluctuation Structure
JSON STRUCTUREFixer Rates Structure
JSON STRUCTUREFixer Symbols Structure
JSON STRUCTUREFixer Timeseries Structure
JSON STRUCTUREExamples 6
Example request and response payloads for these APIs.
Fixer Getfluctuation Example
EXAMPLEFixer Gethistorical Example
EXAMPLEFixer Getlatest Example
EXAMPLEFixer Getsymbols Example
EXAMPLEFixer Gettimeseries Example
EXAMPLESecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 6
What developers build with this provider.
E-Commerce Multi-Currency Pricing
Convert prices into the shopper's local currency at checkout using /convert.
Treasury and Cash Reporting
Daily mark-to-market of multi-currency balances using /timeseries and /fluctuation.
Travel and Fintech Apps
Power in-app FX widgets, traveler wallets, and remittance quotes with /latest.
Accounting and Ledger Reconciliation
Look up the official end-of-day rate for any historical transaction with /{date}.
Backtesting and Analytics
Pull windowed rate history with /timeseries to feed quant or BI models.
Compliance and Audit Trails
Reference an immutable ECB-sourced rate when auditing cross-border payments.
Integrations 6
Pre-built integrations with other platforms and tools.
APILayer Marketplace
Fixer is distributed via the APILayer hub; signup, billing, and key management share the marketplace.
European Central Bank
Primary upstream data source for daily reference exchange rates.
money.js
Client-side JavaScript library historically paired with Fixer for browser-side conversion.
Currencylayer
Sister APILayer product with similar FX surface; often used interchangeably or for redundancy.
Coinlayer
Cryptocurrency exchange rate API on the same APILayer platform.
Currencyfreaks / Open Exchange Rates
Competing FX APIs that consumers benchmark Fixer against.
Solutions 5
Packaged solutions this provider offers.
Free Plan
100 requests/month, hourly refresh, EUR 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 $59.99/mo, 10-minute refresh, /timeseries endpoint.
Professional Plus Plan
500,000 requests/month at $99.99/mo, 60-second refresh, /fluctuation endpoint.
Enterprise Plan
Custom volume, 60-second refresh, dedicated account team and priority support.
Resources
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 3
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 2
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