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After subscribing, you'll receive an API key by email (fl_live_…). Run one command to configure your AI tool:

What this does:

• → Validates your API key against api.flatlandfi.com
• → Detects Claude Code and/or Cursor on your machine
• → Writes the MCP server config automatically — no manual file editing
• → Runs a live end-to-end connection test

Expected output:

If you see errors, run npx flatland-setup --verify to diagnose.

Open a new Claude Code session — start fresh after running npx flatland-setup. Paste this prompt:

Claude calls flatland_init (invisible to you), then builds and compiles. You'll see output like:

Model: saas_starter
Period: Month 1

  price_per_seat     $49.00
  seats_sold         200
  monthly_growth     8.00%
  monthly_revenue    $9,800.00
  annual_revenue     $117,600.00

Compilation complete. Model saved to ./flatland/models/saas_starter.json

The model JSON is saved locally at ./flatland/models/saas_starter.json. You own it — it stays on your disk.

Scenarios let you compare assumptions without touching the base model. Paste this prompt:

You'll see a side-by-side comparison:

Scenario: high_growth vs. base

  Driver              Base          High Growth    Delta
  ─────────────────── ──────────── ────────────── ─────────
  seats_sold          200           250            +50
  monthly_growth      8.00%         15.00%         +7.0pp
  monthly_revenue     $9,800        $12,250        +$2,450
  annual_revenue      $117,600      $147,000       +$29,400

Scenarios are sparse overlays — only the changed assumptions differ from the base model.

Sensitivity analysis tells you which inputs move your outputs the most. Paste this prompt:

You'll see a ranked table:

Sensitivity: annual_revenue

  Driver                 -20%          Base          +20%       Elasticity
  ─────────────────────  ──────────── ──────────── ──────────── ──────────
  price_per_seat         $94,080       $117,600     $141,120     1.00
  monthly_growth_rate    $94,080       $117,600     $141,120     1.00

Both inputs have equal elasticity on annual_revenue in a single-period model.
Add more periods or a compounding formula to see divergence.

To see divergence, ask Claude to extend the model to 12 months with compounding — growth-rate elasticity increases dramatically over time.

Flatland exposes its full engine over the MCP standard, so any MCP-compatible client can talk to it. Claude Code is the supported default — Cursor and the generic case below.

Endpoint:

Cursor (recommended): the same one-liner — flatland-setup detects Cursor and writes its config automatically.

After it finishes, restart Cursor and Flatland's tools appear in the chat. To verify by hand, the config file is at ~/.cursor/mcp.json:

{
  "mcpServers": {
    "flatland": {
      "url": "https://api.flatlandfi.com/mcp",
      "headers": { "X-API-Key": "fl_live_YOUR_KEY_HERE" }
    }
  }
}

Other MCP clients: any tool that speaks the MCP standard accepts an HTTP server URL. Configure with server name flatland, the URL above, and the X-API-Key header. To smoke-test from a terminal:

A 401 means the header didn't reach the server — confirm it's X-API-Key (not Authorization) and the value still starts with fl_live_.

Flatland has one plan:

Your 14-day trial starts the moment you subscribe. You won't be charged until the trial ends. Cancel any time from the Stripe billing portal — your API key expires immediately on cancellation. Your model JSON files stay on your disk and are yours to keep.

There's no free tier and no usage cap. Unlimited models, unlimited compiles, unlimited scenarios and sensitivity runs for the duration of your subscription.

Common next prompts to try in Claude Code: