Converts an amount from one currency to another at the latest or a historical rate. GET /convert accepts from, to, amount, and an optional date parameter; confirmed live returning the applied rate and computed result.
openapi: 3.0.3
info:
title: FXRatesAPI
description: >-
FXRatesAPI is a foreign exchange rates REST API serving real-time and
historical currency exchange rates for 185+ fiat currencies plus major
cryptocurrencies and precious metals. All endpoints return JSON over HTTPS
from the base host https://api.fxratesapi.com. A limited tier is usable
without an API key; a paid API key (passed as the api_key query parameter or
an Authorization Bearer header) raises quotas, increases update frequency,
and unlocks base-currency switching.
Endpoint paths, methods, and parameters below are grounded in live probes of
the API on 2026-07-12. Response schemas are modeled from the observed JSON
payloads rather than a provider-published machine-readable schema, and only
parameters confirmed during probing are asserted; additional optional
parameters may exist.
version: '1.0'
contact:
name: FXRatesAPI
url: https://fxratesapi.com
termsOfService: https://fxratesapi.com/legal/terms-conditions
servers:
- url: https://api.fxratesapi.com
description: FXRatesAPI production
security:
- {}
- apiKeyQuery: []
- bearerAuth: []
tags:
- name: Latest Rates
description: Most recent exchange rates for a base currency.
- name: Historical Rates
description: Exchange rates for a specific past date.
- name: Time-Series
description: Daily exchange rates across a date range.
- name: Convert
description: Convert an amount between two currencies.
- name: Currencies
description: List of supported currencies and their metadata.
paths:
/latest:
get:
operationId: getLatestRates
tags:
- Latest Rates
summary: Get the latest exchange rates
description: >-
Returns the most recent exchange rates for the requested base currency.
Confirmed to respond with HTTP 200 without an API key for a limited tier.
parameters:
- name: base
in: query
required: false
description: Base currency code (ISO 4217). Defaults to USD.
schema:
type: string
default: USD
example: EUR
- name: currencies
in: query
required: false
description: Comma-separated list of currency codes to return. Defaults to all supported currencies.
schema:
type: string
example: USD,GBP
- name: api_key
in: query
required: false
description: Optional API key. May also be supplied via the Authorization Bearer header.
schema:
type: string
responses:
'200':
description: Latest exchange rates.
content:
application/json:
schema:
$ref: '#/components/schemas/RatesResponse'
'400':
$ref: '#/components/responses/Error'
/historical:
get:
operationId: getHistoricalRates
tags:
- Historical Rates
summary: Get historical exchange rates for a date
description: Returns the exchange rates as they were on a specific past date.
parameters:
- name: date
in: query
required: true
description: The date to retrieve rates for, in YYYY-MM-DD format.
schema:
type: string
format: date
example: '2026-01-01'
- name: base
in: query
required: false
description: Base currency code (ISO 4217). Defaults to USD.
schema:
type: string
default: USD
- name: currencies
in: query
required: false
description: Comma-separated list of currency codes to return.
schema:
type: string
- name: api_key
in: query
required: false
schema:
type: string
responses:
'200':
description: Historical exchange rates for the requested date.
content:
application/json:
schema:
$ref: '#/components/schemas/RatesResponse'
'400':
$ref: '#/components/responses/Error'
/timeseries:
get:
operationId: getTimeSeriesRates
tags:
- Time-Series
summary: Get time-series exchange rates
description: Returns daily exchange rates for each date across the requested range.
parameters:
- name: start_date
in: query
required: true
description: Range start date in YYYY-MM-DD format.
schema:
type: string
format: date
example: '2026-01-01'
- name: end_date
in: query
required: true
description: Range end date in YYYY-MM-DD format.
schema:
type: string
format: date
example: '2026-01-05'
- name: base
in: query
required: false
description: Base currency code (ISO 4217). Defaults to USD.
schema:
type: string
default: USD
- name: currencies
in: query
required: false
description: Comma-separated list of currency codes to return.
schema:
type: string
example: EUR
- name: api_key
in: query
required: false
schema:
type: string
responses:
'200':
description: Date-keyed exchange rates across the range.
content:
application/json:
schema:
$ref: '#/components/schemas/TimeSeriesResponse'
'400':
$ref: '#/components/responses/Error'
/convert:
get:
operationId: convertCurrency
tags:
- Convert
summary: Convert an amount between currencies
description: >-
Converts an amount from one currency to another using the latest rate,
or a historical rate when a date is supplied.
parameters:
- name: from
in: query
required: true
description: Source currency code (ISO 4217).
schema:
type: string
example: USD
- name: to
in: query
required: true
description: Target currency code (ISO 4217).
schema:
type: string
example: EUR
- name: amount
in: query
required: true
description: Amount of the source currency to convert.
schema:
type: number
example: 100
- name: date
in: query
required: false
description: Optional date (YYYY-MM-DD) to convert at a historical rate.
schema:
type: string
format: date
- name: api_key
in: query
required: false
schema:
type: string
responses:
'200':
description: Conversion result.
content:
application/json:
schema:
$ref: '#/components/schemas/ConvertResponse'
'400':
$ref: '#/components/responses/Error'
/currencies:
get:
operationId: listCurrencies
tags:
- Currencies
summary: List supported currencies
description: >-
Returns an object keyed by currency code, each value describing the
currency's code, name, plural name, symbol, native symbol, decimal
digits, and rounding. Confirmed live returning 185 entries.
responses:
'200':
description: Map of supported currencies.
content:
application/json:
schema:
type: object
additionalProperties:
$ref: '#/components/schemas/Currency'
components:
securitySchemes:
apiKeyQuery:
type: apiKey
in: query
name: api_key
description: API key passed as the api_key query parameter.
bearerAuth:
type: http
scheme: bearer
description: 'API key passed as an Authorization: Bearer <API_KEY> header.'
responses:
Error:
description: Error response.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
schemas:
RatesResponse:
type: object
description: Modeled from observed /latest and /historical JSON payloads.
properties:
success:
type: boolean
example: true
terms:
type: string
example: https://fxratesapi.com/legal/terms-conditions
privacy:
type: string
example: https://fxratesapi.com/legal/privacy-policy
timestamp:
type: integer
description: Unix timestamp of the rate snapshot.
example: 1783883940
date:
type: string
format: date-time
example: '2026-07-12T19:19:00.000Z'
base:
type: string
example: USD
rates:
type: object
description: Map of currency code to exchange rate against the base.
additionalProperties:
type: number
example:
EUR: 0.8761481387
GBP: 0.7461771444
TimeSeriesResponse:
type: object
description: Modeled from the observed /timeseries JSON payload.
properties:
success:
type: boolean
example: true
base:
type: string
example: USD
start_date:
type: string
format: date-time
example: '2026-01-01T00:00:00.000Z'
end_date:
type: string
format: date-time
example: '2026-01-05T00:00:00.000Z'
rates:
type: object
description: Map of date-time to a map of currency code and rate.
additionalProperties:
type: object
additionalProperties:
type: number
example:
'2026-01-04T23:59:00.000Z':
EUR: 0.854400106
ConvertResponse:
type: object
description: Modeled from the observed /convert JSON payload.
properties:
success:
type: boolean
example: true
query:
type: object
properties:
from:
type: string
example: USD
to:
type: string
example: EUR
amount:
type: number
example: 100
info:
type: object
properties:
rate:
type: number
example: 0.8511001313
historical:
type: boolean
example: false
date:
type: string
format: date-time
example: '2026-01-01T23:59:00.000Z'
timestamp:
type: integer
example: 1767311940
result:
type: number
example: 85.11001313
Currency:
type: object
description: Modeled from the observed /currencies JSON payload.
properties:
code:
type: string
example: EUR
name:
type: string
example: Euro
decimal_digits:
type: integer
example: 2
name_plural:
type: string
example: euros
rounding:
type: number
example: 0
symbol:
type: string
example: "€"
symbol_native:
type: string
example: "€"
ErrorResponse:
type: object
description: >-
Modeled from observed error payloads. FXRatesAPI returns success=false
with either a nested error object ({message}) or a flat error string plus
a description field, depending on the endpoint and failure mode.
properties:
success:
type: boolean
example: false
error:
oneOf:
- type: string
example: missing_from_currency
- type: object
properties:
message:
type: string
example: Endpoint Not Found
description:
type: string
example: The from currency is required for the convert endpoint.