# Api

> 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.

- **Domain**: `api.freesmallbiztools.com`
- **Provider**: api.freesmallbiztools.com (https://api.freesmallbiztools.com/)
- **Kind**: paid_api
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 70%
- **Payment protocol**: x402 · network `eip155:8453` · ≥ $0.01
- **Wallet**: `0x2daf658b01e257206375798a15832e9f547d65dd`

## URLs
- Agent card: https://api.freesmallbiztools.com/
- Page (HTML): https://agenstry.com/agents/api.freesmallbiztools.com
- Documentation: https://api.freesmallbiztools.com/v1/late-fee-notice