Movable Capital Watch my cash

For builders and AI assistants

Free cash-rate data, sourced and dated

The same verified rates as this site, as JSON and as a connector for Claude and other AI assistants. No key, no sign-up. Credit Movable Capital and link the page we give for each rate.

Connect Claude (MCP)

Add a custom connector with this URL. It needs no sign-in.

https://www.movablecapital.com/api/mcp

In Claude: Settings → Connectors → Add custom connector. In Claude Code: claude mcp add --transport http movable-capital https://www.movablecapital.com/api/mcp. Tools:

  • get_cash_rates: the highest verified rates by kind (savings, money fund, CD, Treasury, sweep).
  • get_sweep_rate: what a broker pays on uninvested cash by default, by account type, and how to move it.
  • compare_after_tax: for a balance and tax rates, what each option keeps after federal and state tax.
  • get_treasury_yields: today’s Treasury par yield curve.

Every answer carries the rate’s date, the provider’s page and a link to ours, so an assistant can cite it.

JSON API

Static files, updated every business day. Start at /data/v1/index.json; the OpenAPI description lists them all.

One row from sweeps.json:

{
  "provider": "Vanguard",
  "name": "Vanguard brokerage",
  "accountType": "Self-directed brokerage",
  "ratePct": 3.88,
  "verifiedOn": "2026-10-30",
  "sourceUrl": "https://investor.vanguard.com/investment-products/mutual-funds/profile/vmfxx",
  "citeUrl": "https://www.movablecapital.com/sweep-rates/vanguard",
  "howToMove": "https://www.movablecapital.com/how-to-move-cash/vanguard"
}

Terms

License CC BY 4.0. Credit “Movable Capital (movablecapital.com)” and link the citeUrl. Cache on your side; files change once a day. For a higher-touch license (history, alerts, support) write to hello@movablecapital.com.

Providers never pay Movable Capital: not for listing, ranking or referrals. Information, not advice. Rates change; confirm with the provider before moving money.