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Before you connect a coding agent or chat client, it helps to know how OpenFinance recognises it. The short version: your client either signs in with OAuth or sends your key, and the key costs nothing.

Do I need an API key?

Every OpenFinance MCP request needs OAuth sign-in or an x-api-key header, including market data, prices, funding rates, order books and trade previews. There is no keyless tier. Clients that support OAuth, such as Claude.ai and ChatGPT custom connectors, can sign in to your OpenFinance account instead: add the server URL with no header and approve the consent page when it opens. Please make an account at openfinance.tech to get your keys.

Get an API Key

If your client uses a key, here is where to find yours:
1

Make an account

Sign up or sign in at openfinance.tech. Your embedded wallet is created at the same time.
2

Open External AI

Open External AI in the sidebar.
3

Copy the key

Your key is created for you when you first sign in, one per account. In the Connect OpenFinance to your AI card, click the copy button next to API key. The value starts with open_.
Treat your API key like a password. It carries the same permissions as your account, including placing trades and sending funds from your wallet. Do not commit it to git or paste it into shared chats.

How the key is used

The key is passed as x-api-key: open_xxxxx in every editor or chat-client config. Requests with neither a key nor an OAuth sign-in return 401 Unauthorized.

Next

Pick your editor or chat client from the Coding Agents or Chat Clients sections in the sidebar.