This article shows you how to register the Cryptohopper Market Data MCP server in Codex so you can query market data from your ChatGPT-powered coding sessions.
Prerequisites
An active ChatGPT subscription
Codex installed on your machine
Your Cryptohopper MCP API key (bearer token)
Setup
Open Codex and start a new session.
Paste the following configuration, replacing YOUR_REAL_MCP_API_KEY with your actual bearer token:
{
"mcpServers": {
"Cryptohopper.com Market Data": {
"type": "http",
"url": "https://mcp-data.cryptohopper.com/mcp",
"headers": {
"Authorization": "Bearer YOUR_REAL_MCP_API_KEY"
}
}
}
}
When asked “Do you want me to update your Codex config so this MCP server is registered?”, choose Yes, and don’t ask again this session.
Restart Codex and open a new chat.
Type: “I want to use the Cryptohopper MCP.”
If Codex asks for further confirmations, keep selecting Yes, don’t ask again.
Once the server is active, start asking your questions.
Doesn't it work?
Authentication errors: Verify your bearer token is correct and still valid. Regenerate it from your Cryptohopper account if necessary.
Server not registered: Make sure you accepted the config update prompt and restarted Codex afterwards.
MCP not responding: Confirm the URL is exactly https://mcp-data.cryptohopper.com/mcp and that your machine can reach it (check firewall or VPN settings).
Commands fail inside Codex: Install any required dependencies for the task before prompting Codex again.