Fixer io MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Fixer io MCP or direct API to fetch real-time rates, convert currencies, check historical forex data, and automate financial insights through natural language.

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Api Key

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

Try Fixer io now

Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
Fixer io
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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.

SETUP GUIDE

Connect Fixer io MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["fixer_io"],
  mcp: true,
});
Create a session scoped to Fixer io and read its MCP URL and headers
3

Connect your agent to the MCP server

typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Convert 100 USD to EUR using today's rates",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a Fixer io request
SETUP GUIDE

Connect Fixer io API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["fixer_io"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to Fixer io
3

Run Fixer io tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Convert 100 USD to EUR using today's rates" }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the Fixer io tool calls through the session, and print the final answer

Why Use Composio?

AI Native Fixer io Integration

  • Supports both Fixer io MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for retrieving, converting, and analyzing currency data

Managed Auth

  • Effortless API Key management and secure storage
  • Central place to manage, scope, and revoke Fixer io access
  • Per user and per environment credentials instead of hard-coded keys

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access Fixer io
  • Scoped, least privilege access to Fixer io resources
  • Full audit trail of agent actions to support review and compliance

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY
FAQ

Frequently asked questions

Yes, Fixer io requires you to configure your own API key credentials. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your Fixer io connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Create the key in your Fixer io account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Fixer io actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Fixer io at any time.

When you connect a Fixer io account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Fixer io as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside Fixer io. If Fixer io lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside Fixer io at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each Fixer io connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment Fixer io rejects the old key. Create a new key in Fixer io and reconnect the account from the Composio dashboard or by asking your agent to reconnect Fixer io. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal Fixer io use. Paid plans add higher limits and team features. Your Fixer io plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple Fixer io accounts).

With Composio, you connect Fixer io once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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