PaidPilot Invoice API
PaidPilot Invoice API: Late fee on an overdue invoice. Flat fee, monthly % or annual %, simple or compounding, with grace days. Returns days late, fee, new total and a paste-ready invoice line. Optional US state for the legal note. Not legal advice; state caps are NOT looked up.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
27 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.paidpilot.io/v1/late-fee
| Category | Everything else |
|---|---|
| Provider host | api.paidpilot.io |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.01 | 27 ms |
Example input (from the provider)
{
"body": {
"amount": 1610.35,
"as_of": "2026-10-11",
"compounding": false,
"currency": "USD",
"due_date": "2026-09-01",
"fee_type": "monthly_percent",
"grace_days": 5,
"rate_percent": 1.5,
"state": "NE"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"amount": {
"description": "Unpaid invoice amount",
"exclusiveMinimum": 0,
"maximum": 1000000000,
"type": "number"
},
"as_of": {
"description": "Date paid, or the date to calculate to, YYYY-MM-DD (default: today, UTC)",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
},
"compounding": {
"default": false,
"description": "false = simple interest (default); true = compounds (monthly: per 30 days; annual: daily)",
"type": "boolean"
},
"currency": {
"default": "USD",
"description": "ISO-4217, default USD",
"type": "string"
},
"due_date": {
"description": "Invoice due date, YYYY-MM-DD",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
},
"fee_type": {
"description": "flat = one fixed fee; monthly_percent e.g. 1.5; annual_percent e.g. 18",
"enum": [
"flat",
"monthly_percent",
"annual_percent"
],
"type": "string"
},
"flat_fee": {
"description": "Flat fee; required for fee_type=flat, optional one-time add-on otherwise",
"maximum": 1000000,
"minimum": 0,
"type": "number"
},
"grace_days": {
"default": 0,
"description": "Days after the due date before any fee applies",
"maximum": 365,
"minimum": 0,
"type": "integer"
},
"rate_percent": {
"description": "Rate for monthly_percent / annual_percent",
"maximum": 100,
"minimum": 0,
"type": "number"
},
"state": {
"description": "US state (2-letter) for the legal note",
"type": "string"
}
},
"required": [
"amount",
"due_date",
"fee_type"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}