api.freesmallbiztools.com
Write a late-fee reminder email for an overdue invoice. $0.01 USDC on Base per call. Calculates the late fee and returns a ready-to-send subject and body in a polite, firm or final tone. Bad input returns 400 and is not charged. Don't use this for sending email; it only returns text.
Offering
- Provider
- api.freesmallbiztools.com
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Business And Commerce
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://api.freesmallbiztools.com/v1/late-fee-notice- MIME type
- application/json
- First seen
- 2026-10-16T01:50:24.663Z
- Last seen
- Tags
- late-fee, invoice-reminder, overdue-invoice, email-template, small-business, X402, MCP
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"payTo": "0x2dAF658B01e257206375798a15832E9f547D65dD"
}
]Observed health
- Status
- Healthy
- Latest latency
- 273 ms
- Average latency
- 897 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"amount": {
"type": "string",
"description": "Invoice amount, e.g. 1200"
},
"due_date": {
"type": "string",
"description": "YYYY-MM-DD"
},
"paid_date": {
"type": "string",
"description": "YYYY-MM-DD (default today)"
},
"rate": {
"type": "string",
"description": "Rate number (default 1.5)"
},
"rate_type": {
"type": "string",
"enum": [
"monthly_percent",
"annual_percent",
"daily_percent",
"flat"
]
},
"grace_days": {
"type": "string"
},
"tone": {
"type": "string",
"enum": [
"polite",
"firm",
"final"
]
},
"client_name": {
"type": "string"
},
"business_name": {
"type": "string"
},
"invoice_number": {
"type": "string"
}
},
"required": [
"amount",
"due_date"
]
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"input": {
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"amount": {
"type": "string",
"description": "Invoice amount, e.g. 1200"
},
"due_date": {
"type": "string",
"description": "YYYY-MM-DD"
},
"paid_date": {
"type": "string",
"description": "YYYY-MM-DD (default today)"
},
"rate": {
"type": "string",
"description": "Rate number (default 1.5)"
},
"rate_type": {
"type": "string",
"enum": [
"monthly_percent",
"annual_percent",
"daily_percent",
"flat"
]
},
"grace_days": {
"type": "string"
},
"tone": {
"type": "string",
"enum": [
"polite",
"firm",
"final"
]
},
"client_name": {
"type": "string"
},
"business_name": {
"type": "string"
},
"invoice_number": {
"type": "string"
}
},
"required": [
"amount",
"due_date"
]
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
},
"output": {
"type": "object",
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
},
"required": [
"type"
]
}
},
"required": [
"input"
]
}