fixer

name

fixer

description

Fixer is a currency exchange rates and foreign exchange data API that provides real-time and historical rates for 170+ world currencies, allowing developers and finance teams to power conversion, reporting, and international pricing workflows in applications. Read and write Fixer data through One: historicalrates, latestrates, timeseriesrates, currencyconversion, supportedsymbols, fluctuation and more, 6 actions with real parameter documentation. Use whenever the user asks to look something up in Fixer, create or update a record there, or build code against the Fixer API.

Fixer through One

Fixer is a currency exchange rates and foreign exchange data API that provides real-time and historical rates for 170+ world currencies, allowing developers and finance teams to power conversion, reporting, and international pricing workflows in applications.

One exposes Fixer through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.

How to run an action

1. Find the action in the table below, or call search_one_platform_actions with platform fixer if it is not listed.
2. Call get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
3. Call execute_one_action with parameters copied from that knowledge.

Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.

Before you start

Call list_one_integrations once and confirm Fixer is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.

Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.

Before a write

Creates, updates, deletes and sends land on a real Fixer account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.

Actions

HistoricalRates

Action	Method	Path	Action id
Get Historical Rates	GET	/api/{{date}}	conn_mod_def::GMIjUlo2GAg::JAzdL0wiTNuZQqx_KrNG4w

LatestRates

Action	Method	Path	Action id
Latest Rates	GET	/api/latest	conn_mod_def::GMIjUmNLsLs::0QIMZ-lMTaikX_nbqvNvyg

TimeSeriesRates

Action	Method	Path	Action id
Time Series Rates	GET	/api/timeseries	conn_mod_def::GMIjUxISixY::UEjnrnerQV-jmAa7NO5cAg

CurrencyConversion

Action	Method	Path	Action id
Convert Currency	GET	/api/convert	conn_mod_def::GMIjUmjelB0::F5o0iXF1RrC6PU8TSbO6bQ

SupportedSymbols

Action	Method	Path	Action id
Get Supported Symbols	GET	/api/symbols	conn_mod_def::GMIjUmIChRU::BN-G_YDWQTmpWHbHM1gs3g

Fluctuation

Action	Method	Path	Action id
Fluctuation Using Fixer	GET	/api/fluctuation	conn_mod_def::GMIjUmLOiJY::tXQHS2AnQVG8PEJrdBN1wg

When a call fails

The error comes from Fixer, not from One. A 400 or 422 means your parameters do not match the schema, so re-read the knowledge and fix the field. A 401 or 403 means the connection needs re-authorizing, which no retry will fix. A 404 means the id is not on this account. A 429 means slow down. Never retry a write more than once: the first attempt may have landed.

Full catalog: https://www.withone.ai/knowledge/fixer

Integration knowledge by One (withone.ai), licensed under One-Knowledge-1.0. Attribution must be preserved in derivative works.