Dunn for AI assistants

Updated October 5, 2026

Free tools for getting paid on time, inside Claude, ChatGPT, Hermes or any assistant that supports MCP. No account, no sign-in.

What it does

• Due date from payment terms. The exact due date for "net 30", "due on receipt", "EOM", "net 30 EOM" or "2/10 net 30", including the early-payment discount date.
• Late fee calculator. The fee, the new total, the exact day it applies, a line to put on the invoice, and whether the fee is in the usual range.
• How late is this invoice? Days late (or until due), what to send the client now, and what comes next.
• Payment reminder email. The right reminder for where the invoice is: before it's due, due today, late, or a final notice. Polite by default, firm if you ask.

Try asking: "My client's $1,200 invoice was due September 20. How late is it and what should I send?" or "What's a fair late fee on a $3,000 invoice due October 31, with a week's grace?"

Add it to your assistant

• Claude: Settings → Connectors → Add custom connector. Name it Dunn and paste https://getdunn.org/mcp.
• Hermes Agent: run hermes mcp add dunn --url https://getdunn.org/mcp
• Other MCP clients: add a remote (Streamable HTTP) server at https://getdunn.org/mcp. No authentication.

Your data

The tools only do math and write text from what you send. Dunn doesn't store your requests, doesn't need an account, and never sees your clients' data through these tools. Our server keeps standard technical logs (such as time and IP address) for security, as described in our privacy policy.

Want it done for you?

These tools tell you what to send. Dunn sends the reminders on schedule and adds the late fee automatically, from your own Stripe account, so you don't have to chase anyone.

Help

Questions or problems: hello@getdunn.org