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How to connect Fixer io to Claude

Connect Claude Web, Desktop and Cowork to Fixer io MCP. Convert 150 usd to eur today, show exchange rate trends for gbp last month, and more using natural language, with authentication handled for you.

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Fixer.io is a lightweight API for real-time and historical foreign exchange rates. It makes global currency conversion fast, accurate, and hassle-free.

5 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Fixer io account to Claude via Composio Connect, enabling it to convert 150 USD to EUR today, show exchange rate trends for GBP last month, list all supported currency codes and names, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Fixer io with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Fixer io to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Fixer io account

Back in Claude, ask it to connect to Fixer io or give it any Fixer io-related task.

For example, ask Claude to:

  • "Convert 150 USD to EUR today"
  • "Show exchange rate trends for GBP last month"
  • "List all supported currency codes and names"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Fixer io account is ready to use.

What is the Fixer io Claude Connector, and what's possible with it?

The Fixer io MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Fixer io account. It provides structured and secure access to global currency exchange data, so your agent can perform actions like converting currencies, fetching historical rates, tracking exchange fluctuations, and listing supported symbols on your behalf.

  • Real-time currency conversion: Instantly convert amounts between currencies using up-to-date or historical exchange rates with a single prompt.
  • Fetch latest and historical rates: Let your agent retrieve the most recent exchange rates or get historical rates for any supported date to power financial analysis.
  • Analyze currency fluctuations: Ask your agent to track and summarize day-to-day currency changes between two dates to monitor trends or volatility.
  • Retrieve supported currency symbols: Quickly list all available currency codes and their full names to support app interfaces or custom workflows.
  • Get exchange rate time series: Easily pull daily exchange rates over a custom period (up to 365 days) for detailed trend analysis or reporting.

Troubleshooting

1. Why does Claude not use the Composio connector for Fixer io?

The connector can show as connected, but Claude must use it in each Fixer io conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Fixer io again.

2. Why does Claude show an MCP server error before Fixer io connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Fixer io.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Fixer io.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Fixer io authorization link not work?

The Composio connector is one server. Your Fixer io account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Fixer io connection.
  • Composio creates a fresh Fixer io authorization link.
  • Open that link in your browser and finish the Fixer io sign-in.

4. Why do Fixer io actions fail after they worked before?

The Fixer io connection can expire or lose permission.

  • Ask Claude to inspect the Fixer io connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Fixer io account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Fixer io.
  • If the action still fails with a permission error, check that the connected account has that permission in Fixer io itself.

5. How do I switch to a different Fixer io account?

Claude can manage the Fixer io connection for you.

  • Ask Claude to disconnect or delete the current Fixer io account.
  • Ask Claude to connect Fixer io again.
  • Open the new Composio authorization link for Fixer io.
  • Sign in with the other Fixer io account in the browser.
  • After the account connects, ask Claude to retry the Fixer io task.

6. Why is my Fixer io connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Fixer io connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Fixer io tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Fixer io.
TOOLS

Supported Tools

Every Fixer io action and event your agent gets out of the box.

Convert Currency

Tool to convert an amount from one currency to another.

Get Currency Fluctuations

Tool to fetch exchange rate fluctuations between two dates.

Get Historical Rates

Fetch historical exchange rates for a specific date.

Get Supported Symbols

Tool to retrieve the list of all available currency symbols and their corresponding names.

Get Time Series

Retrieves daily foreign exchange rates for a date range.

FRAMEWORKS

How to build Fixer io MCP Agent with another framework

Claude Code logo

Claude Code

Use Fixer io MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Fixer io MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Fixer io MCP with Claude Agent SDK

Codex logo

Codex

Use Fixer io MCP with Codex

OpenClaw logo

OpenClaw

Use Fixer io MCP with OpenClaw

Hermes logo

Hermes

Use Fixer io MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Fixer io MCP with Atomic Agent

Google ADK logo

Google ADK

Use Fixer io MCP with Google ADK

LangChain logo

LangChain

Use Fixer io MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Fixer io MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Fixer io MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Fixer io MCP with LlamaIndex

CrewAI logo

CrewAI

Use Fixer io MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Fixer io MCP with Pydantic AI

AutoGen logo

AutoGen

Use Fixer io MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Fixer io MCP server, the agents and LLMs can only access a fixed set of Fixer io tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Fixer io and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Fixer io tools.

Yes, absolutely. You can configure which Fixer io scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Fixer io data and credentials are handled as safely as possible.

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