One MCP server, hosted by us. Your assistant reads levels, flow and history for every US option by itself. Nothing to install: the first time it needs your account, it asks you to sign in.
Server URL
https://mcp.No key needed: you sign in with your DataFirst account.
Until you sign in, answers cover finished sessions only and end with “DEMO MODE”.
To allow every tool at once: Customize → Connectors → DataFirst → Tool permissions → Always allow. If Claude doesn't use DataFirst, turn it on under + → Connectors. Claude on iPhone and Android picks the connector up too.
/mcp. Or ask the assistant for a sign-in link.Every public endpoint as a tool, plus a session summary in one call, “replay at this time”, and chart-ready data.
Live data at your plan's freshness, history to your plan's depth, every symbol. Before you sign in: finished sessions only.
Tool calls are API calls on your plan. The me tool tells the assistant how many it has left today, so it can pace itself.
Your API key never leaves our servers. The assistant gets a token that stands for you, and you can revoke it any time in Account or by removing the connector in the app.
Your API key is for your own use. Data you receive through the API, including values derived from it, is covered by your market data agreement and may not be redistributed. Real-time data requires accepting the subscriber agreement and stating whether you are a Professional or Nonprofessional subscriber.
●datafirst · levels("SPY")
SPY's gamma flip is at $766.51, just under spot at $766.92. Net dealer gamma is still negative at −$2.51B, so dealers are short gamma: moves can stretch rather than mean-revert until that flips.
Example conversations with sample data.
Every plan gets all the live data. Plans differ in how you reach it, how far back history goes, and how much your code or assistant may call.
Try it out
$0
The dashboard
$49.99/ month
Dashboard and terminal
$99/ month
The full API and MCP
$249/ month
Firms, platforms, research
$999/ month
REST and WebSocket, with a data and a meta block on every answer and stable error codes. Already on another GEX API? The compatible endpoints answer the same paths.