Free invoice tools: due dates from payment terms, late fees, days late, payment reminder emails.
Connect Remote server
claude mcp add --transport http dunn https://getdunn.org/mcp
{
"mcpServers": {
"dunn": {
"url": "https://getdunn.org/mcp"
}
}
}
{
"servers": {
"dunn": {
"type": "http",
"url": "https://getdunn.org/mcp"
}
}
}
Settings > Connectors > Add custom connector
URL: https://getdunn.org/mcp
Tools 4 found in our last check
invoice_due_dateExact due date for an invoice from its date and payment terms ("net 30", "due on receipt", "EOM", "net 30 EOM", "2/10 net 30"), including any early-payment discount date.
late_fee_calculatorWorks out a late fee: the amount, the new total, the exact day it applies, a ready-to-use line for the invoice, and whether the fee is in the usual range.
how_late_is_this_invoiceHow many days late an invoice is (or until it is due), and what to send the client now and next, following a proven reminder schedule.
payment_reminder_emailWrites the right payment reminder for where the invoice is now (before due, due today, late, or a final notice), with subject line. Polite by default; firm on request.
Details
| Endpoint | https://getdunn.org/mcp (Streamable HTTP) |
| First published | 3 Nov 2026 |
| Last updated | 3 Nov 2026 |
| Registry name | org.getdunn/dunn |
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