Use Insidewell MCP with OpenAI Codex CLI

Insider trading API + MCP: SEC Form 4 buys/sells, cluster buys. Keys $19/mo; 100 free/day.

Remote MCP server (Streamable HTTP), nothing to install. Free: 100 free/day · Paid: Keys $19/mo

Set it up

Open ~/.codex/config.toml (create it if needed).
Add the [mcp_servers] table shown and save.
Start Codex; the server's tools are available to the agent.
Ask a question the tools can answer.

Add to ~/.codex/config.toml:

[mcp_servers.insidewell-api]
url = "https://insidewell-api.cybermaxtools.com/mcp?via=use-with-codex"

With a paid key:

[mcp_servers.insidewell-api]
url = "https://insidewell-api.cybermaxtools.com/mcp?via=use-with-codex"
env_http_headers = { "x-api-key" = "CYBERMAX_API_KEY" }

env_http_headers maps the header to an environment variable name, so the key stays in your environment.

Where it goes:

~/.codex/config.toml (or .codex/config.toml in a trusted project)

Config format checked 2026-10-09 against OpenAI Codex CLI's MCP documentation.

Tools you get

Endpoint checked 2026-10-09: https://insidewell-api.cybermaxtools.com/mcp answered an MCP initialize (protocol 2025-06-18) and tools/list with 3 tools, all marked read-only. No key was used and no tool was called.

Tool	What it does	Required inputs
`insider_trades`	Latest insider transactions from SEC Form 4 filings (EDGAR, refreshed about once a minute), newest filed first, up to 100 rows: ticker, insider, role, code (P buy, S sale, ...), shares, price, dollar value, dates and the filing link. Defaults to open-market buys and sales filed in the last 7 days.	none
`cluster_buys`	Companies where 2+ different insiders bought the stock on the open market within 7 days (window, minimum insiders and minimum dollars adjustable), with each insider, total dollars and filing links.	none
`data_status`	When Insidewell last pulled new Form 4 filings from EDGAR and which filed dates it covers.	none

Test the endpoint from a terminal

This lists the tools without a key and without calling any of them:

curl -s https://insidewell-api.cybermaxtools.com/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

If it does not work

Each server is its own [mcp_servers.<name>] table; keep the name to letters, digits, dashes and underscores.
For a fixed header value instead of an environment variable, Codex also documents http_headers.
The free tier has a daily limit (see the pricing line above); a paid key raises it.

Insidewell in other clients

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