# How to integrate Fixer MCP with Codex

```json
{
  "title": "How to integrate Fixer MCP with Codex",
  "toolkit": "Fixer",
  "toolkit_slug": "fixer",
  "framework": "Codex",
  "framework_slug": "codex",
  "url": "https://composio.dev/toolkits/fixer/framework/codex",
  "markdown_url": "https://composio.dev/toolkits/fixer/framework/codex.md",
  "updated_at": "2026-05-06T08:11:58.223Z"
}
```

## Introduction

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Fixer MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

## Also integrate Fixer with

- [OpenAI Agents SDK](https://composio.dev/toolkits/fixer/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/fixer/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/fixer/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/fixer/framework/claude-cowork)
- [OpenClaw](https://composio.dev/toolkits/fixer/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/fixer/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/fixer/framework/cli)
- [Google ADK](https://composio.dev/toolkits/fixer/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/fixer/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/fixer/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/fixer/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/fixer/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/fixer/framework/crew-ai)

## TL;DR

### Why use Composio?
Apart from a managed and hosted MCP server, you will get:
- CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
- Large tool responses: Handle them to minimise context rot.
- Dynamic just-in-time access to 20,000 tools across 870+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.

## Connect Fixer to Codex

### How to install Fixer MCP in Codex
### Run the setup command
Run this command in your terminal to add the Composio MCP server to Codex.

```bash
codex mcp add composio --url https://connect.composio.dev/mcp
```

## What is the Fixer MCP server, and what's possible with it?

The Fixer 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 account. It provides structured and secure access to real-time and historical foreign exchange data, so your agent can fetch current rates, check past currency values, and look up supported symbols with ease.
- Live exchange rate retrieval: Instantly get the most up-to-date currency conversion rates for any supported global currency pair.
- Historical currency data access: Ask your agent to pull exchange rates for specific dates in the past, making trend analysis and financial reporting effortless.
- Supported currency symbol lookup: Quickly retrieve the full list of available currency codes and names to validate inputs or display options for users.
- Multi-currency comparisons: Let your agent fetch and compare rates across multiple currencies at once to power financial dashboards or conversion tools.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `FIXER_GET_HISTORICAL_RATES` | Get Historical Rates | Tool to get historical exchange rate data for a specific date. use when you need past currency rates for all or selected currencies. |
| `FIXER_GET_LATEST_RATES` | Get Latest Exchange Rates | Tool to get real-time exchange rate data for all available or specified currencies. use when you need current forex rates before performing currency conversions. |
| `FIXER_GET_SUPPORTED_SYMBOLS` | Get Supported Symbols | Tool to retrieve all supported currency symbols and their full names. use when you need to display or validate available currencies before performing conversions. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

The Fixer MCP server provides comprehensive access to Fixer operations through Composio. Once connected, you can perform all major Fixer actions directly from Codex using natural language commands.

## Complete Code

None listed.

## Conclusion

### Conclusion
You've successfully integrated Fixer with Codex using Composio's MCP server. Now you can interact with Fixer directly from your terminal, VS Code, or the Codex App using natural language commands.
Key benefits of this setup:
- Seamless integration across CLI, VS Code, and standalone app
- Natural language commands for Fixer operations
- Managed authentication through Composio
- Access to 20,000+ tools across 870+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Fixer operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities

## How to build Fixer MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/fixer/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/fixer/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/fixer/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/fixer/framework/claude-cowork)
- [OpenClaw](https://composio.dev/toolkits/fixer/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/fixer/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/fixer/framework/cli)
- [Google ADK](https://composio.dev/toolkits/fixer/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/fixer/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/fixer/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/fixer/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/fixer/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/fixer/framework/crew-ai)

## Related Toolkits

- [Stripe](https://composio.dev/toolkits/stripe) - Stripe is a global online payments platform offering APIs for managing payments, customers, and subscriptions. Trusted by businesses for secure, efficient, and scalable payment processing worldwide.
- [Alpha vantage](https://composio.dev/toolkits/alpha_vantage) - Alpha Vantage is a financial data platform offering real-time and historical stock market APIs. Get instant, reliable access to equities, forex, and technical analysis data for smarter trading decisions.
- [Altoviz](https://composio.dev/toolkits/altoviz) - Altoviz is a cloud-based billing and invoicing platform for businesses. It streamlines online payments, expense tracking, and customizable invoice management.
- [Benzinga](https://composio.dev/toolkits/benzinga) - Benzinga provides real-time financial news and data APIs for market coverage. It helps you track breaking news and actionable market insights instantly.
- [Brex](https://composio.dev/toolkits/brex) - Brex provides corporate credit cards and spend management tailored for startups and tech businesses. It helps optimize company cash flow, streamline accounting, and accelerate business growth.
- [Chaser](https://composio.dev/toolkits/chaser) - Chaser is accounts receivable automation software that sends invoice reminders and helps businesses get paid faster. It streamlines the collections process to save time and improve cash flow.
- [Clientary](https://composio.dev/toolkits/clientary) - Clientary is a platform for managing clients, invoices, projects, proposals, and more. It streamlines client work and saves you serious admin time.
- [Coinbase](https://composio.dev/toolkits/coinbase) - Coinbase is a platform for buying, selling, and storing cryptocurrency. It makes exchanging and managing crypto simple and secure for everyone.
- [Coinranking](https://composio.dev/toolkits/coinranking) - Coinranking is a comprehensive cryptocurrency market data platform offering access to real-time coin prices, market caps, and historical data. Get accurate, up-to-date stats for thousands of digital assets in one place.
- [Coupa](https://composio.dev/toolkits/coupa) - Coupa is a business spend management platform for procurement, invoicing, and expenses. It helps organizations streamline purchasing, control costs, and gain complete visibility over financial operations.
- [CurrencyScoop](https://composio.dev/toolkits/currencyscoop) - CurrencyScoop is a developer-friendly API for real-time and historical currency exchange rates. Easily access fiat and crypto data for smart, up-to-date financial applications.
- [Daffy](https://composio.dev/toolkits/daffy) - Daffy is a modern charitable giving platform with a donor-advised fund. Easily set aside funds, grow them tax-free, and donate to over 1.7 million U.S. charities.
- [Eagle doc](https://composio.dev/toolkits/eagle_doc) - Eagle doc is an AI-powered OCR API for invoices and receipts. It delivers fast, reliable, and accurate document data extraction for seamless automation.
- [Elorus](https://composio.dev/toolkits/elorus) - Elorus is an online invoicing and time-tracking software for freelancers and small businesses. Easily manage finances, bill clients, and track work in one place.
- [Eodhd apis](https://composio.dev/toolkits/eodhd_apis) - Eodhd apis delivers comprehensive financial data, including live and historical stock prices, via robust APIs. Easily access reliable, up-to-date market insights to power your apps, dashboards, and analytics.
- [Fidel api](https://composio.dev/toolkits/fidel_api) - Fidel api is a secure platform for linking payment cards to web and mobile apps. It enables real-time card transaction monitoring and event-based automation for businesses.
- [Finage](https://composio.dev/toolkits/finage) - Finage is a secure API platform delivering real-time and historical financial data for stocks, forex, crypto, indices, and commodities. It empowers developers and businesses to access, analyze, and act on market data instantly.
- [Finmei](https://composio.dev/toolkits/finmei) - Finmei is an invoicing tool that simplifies billing, invoice management, and expense tracking. Ideal for automating and organizing your business finances in one place.
- [Fixer io](https://composio.dev/toolkits/fixer_io) - Fixer.io is a lightweight API for real-time and historical foreign exchange rates. It makes global currency conversion fast, accurate, and hassle-free.
- [Flutterwave](https://composio.dev/toolkits/flutterwave) - Flutterwave is a global payments platform enabling businesses to accept and send payments across Africa and beyond. Its robust APIs simplify cross-border transactions and financial operations.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Fixer MCP?

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

### Can I use Tool Router MCP with Codex?

Yes, you can. Codex 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 tools.

### Can I manage the permissions and scopes for Fixer while using Tool Router?

Yes, absolutely. You can configure which Fixer 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.

### How safe is my data with Composio Tool Router?

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 data and credentials are handled as safely as possible.

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