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Free Small Biz Tools Late-Fee Reminder Email Generator
x402
Free Small Biz Tools Late-Fee Reminder Email Generator is a paid API for AI agents from api.freesmallbiztools.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).
Calculates the late fee on an overdue invoice and generates a ready-to-send reminder email (subject + body) in polite, firm, or final tone.
Price / call$0.01
Success—
StatusUnknown
How this service works
Free Small Biz Tools API: Late-fee reminder email for an overdue invoice. Calculates the late fee and writes a ready-to-send reminder (subject + body) in a polite, firm or final tone. Bad input 400, never charged.
Output
Returns a JSON object with the notice kind, tone, and a ready-to-send email containing a subject line and full body text. The body includes the calculated late fee amount, days overdue, and a professional message tailored to the requested tone (polite, firm, or final).
Example use cases
Freelancer chasing unpaid design invoice
“Write a firm late-fee reminder for my client Jordan Creative, invoice #FC-089 for $2,400 due on 2025-04-15. Use a 1.5% monthly rate with no grace days. My business is Studio Pixel.”
Final notice for long-overdue contractor payment
“Generate a final-notice late-fee email for Riverside Builds — invoice #RC-441 for $5,000 that was due on 2025-02-28. Charge a flat $150 late fee. My company is ProTech Services.”
Automated overdue billing for SaaS subscription
“Compose a polite overdue payment reminder for TechStart LLC, invoice #SUB-7712 for $350 due on 2025-05-10, applying a 15% annual late fee rate and a 3-day grace period. Business name is CloudBase Inc.”
Technical details
Endpoint
GEThttps://api.freesmallbiztools.com/v1/late-fee-notice?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to automatically generate a professional, tone-calibrated late-fee reminder email without building the calculation or copy logic yourself. It is ideal for small business automation workflows, freelance billing agents, or any scenario where the agent needs to produce a human-ready overdue notice including a computed late fee in a single API call.
Side effects
- 400 Bad Request when required parameters (amount or due_date) are missing or malformed
- 400 returned for invalid date formats (must be YYYY-MM-DD)
- 400 returned for unsupported rate_type or tone enum values
- Invalid numeric strings for amount or rate may trigger 400
- No actual email is sent — the endpoint only generates the copy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "late_fee_notice",
"tone": "polite",
"email": {
"body": "Hi there, ...",
"subject": "Friendly reminder: your invoice was due 2026-09-01"
}
}
}Tags
x402
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