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.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Fixer the way a machine reads it — 58 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 — Fixer scores 64.6/100 (strong), with a separate agent-readiness read of 48/100 (agent ready). 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.
How we profile Fixer
Each block below is one kind of artifact we hold for Fixer. 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.
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.
Open Collections 1
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).
Fixer API
OPEN COLLECTIONPricing 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.
Fixer Plans Pricing
PLANSRate 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.
Fixer 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.
Fixer Finops
FINOPSFeatures 9
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.
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 within the panel for all 9 ·
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.
Fixer 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.
Fixer API Rules
SPECTRALFixer 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.
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 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.
Fixer Convert Structure
JSON STRUCTUREFixer Fluctuation Structure
JSON STRUCTUREFixer Rates Structure
JSON STRUCTUREFixer Symbols Structure
JSON STRUCTUREFixer Timeseries 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.
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 — 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 6
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.
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 tell you where this provider already fits in a stack.
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 the provider offers on top of the raw API surface.
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
Every other property we hold for Fixer — 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 2
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
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