Day91

MCP alpha

Eight tools, callable by an assistant.

The Day91 MCP server exposes the same eight tools you run in the browser as callable functions for AI assistants — Claude, ChatGPT, Cursor, any client that speaks Model Context Protocol. Every response comes back with a link to the filing it was read from. Alpha: read-only, no login, rate-limited.

What it does

Lets an assistant run a Check, pull a Reversal, fill a Grid cell, draft a Battlecard, read a Mirror, watch The Wire, diff a pricing page, or add to the Watchlist — without leaving the chat.

What it returns

Structured claims with a citation to the exact filing, section and page. No prose without a source. The assistant can quote the filing, not paraphrase it.

What it costs

Nothing during alpha. Read-only, no writes, no account. Rate-limited per client so one caller can’t starve the EDGAR fetch.

Connect an assistant

Point your MCP client at the Day91 endpoint. The server is public during alpha — no OAuth, no token. Add this to your client’s server config:

{
  "mcpServers": {
    "day91": {
      "url": "https://day91.club/mcp"
    }
  }
}

Alpha · read-only · source-linked · public until we add accounts