Free Small Biz Tools

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Free quote and late-fee calculators, paid reminder emails and a $1 small-business tool stack report.

Finance & Payments

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https://api.freesmallbiztools.com/mcp

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late_fee Read-only

Free. Late fee on an overdue invoice (simple interest by day: monthly, annual or daily percent, or a flat fee), with days late, total due and a state-cap caution.

amountnumber, required

due_datestring, required

YYYY-MM-DD

ratenumber

default 1.5

paid_datestring

YYYY-MM-DD, default today

rate_typestring

grace_daysnumber

Tools (7)

late_fee

Free. Late fee on an overdue invoice (simple interest by day: monthly, annual or daily percent, or a flat fee), with days late, total due and a state-cap caution.

read-only

Argument	Type	Description
rate	number	default 1.5
amount*	number
due_date*	string	YYYY-MM-DD
paid_date	string	YYYY-MM-DD, default today
rate_type	string
grace_days	number

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "amount",
    "due_date"
  ],
  "properties": {
    "rate": {
      "type": "number",
      "maximum": 1000000,
      "minimum": 0,
      "description": "default 1.5"
    },
    "amount": {
      "type": "number",
      "maximum": 100000000,
      "minimum": 0.01
    },
    "due_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "YYYY-MM-DD"
    },
    "paid_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "YYYY-MM-DD, default today"
    },
    "rate_type": {
      "enum": [
        "monthly_percent",
        "annual_percent",
        "daily_percent",
        "flat"
      ],
      "type": "string"
    },
    "grace_days": {
      "type": "number",
      "maximum": 365,
      "minimum": 0
    }
  }
}

late_fee_notice

Late fee plus a ready-to-send reminder email (subject and body) for an overdue invoice, in a polite, firm or final tone. Costs $0.01 USDC via x402; invalid input is not charged.

read-only

Argument	Type	Description
rate	number	default 1.5
tone	string
amount*	number
due_date*	string	YYYY-MM-DD
paid_date	string	YYYY-MM-DD, default today
rate_type	string
grace_days	number
client_name	string
business_name	string
invoice_number	string

Input schema (JSON)

list_tools

Free. freesmallbiztools.com listings (free/freemium small-business tools, vendor quote and check date), optionally for one category slug.

read-only

Argument	Type	Description
category	string

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "category": {
      "type": "string",
      "maxLength": 60
    }
  }
}

pricing

Free. Prices of the paid tools and the receiving address.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {}
}

quote_pack

Good / better / best quote pack from line items: three priced options, deposit, validity, standard terms and a cover note. Costs $0.05 USDC via x402; invalid input is not charged.

read-only

Argument	Type	Description
items*	array
currency	string
valid_days	number
tax_percent	number
business_name	string
deposit_percent	number
discount_percent	number
best_markup_percent	number
better_markup_percent	number

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "items"
  ],
  "properties": {
    "items": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "unit_price"
        ],
        "properties": {
          "quantity": {
            "type": "number",
            "maximum": 1000000,
            "minimum": 0
          },
          "unit_price": {
            "type": "number",
            "maximum": 100000000,
            "minimum": 0
          },
          "description": {
            "type": "string",
            "maxLength": 200
          }
        }
      },
      "maxItems": 100,
      "minItems": 1
    },
    "currency": {
      "type": "string",
      "maxLength": 3
    },
    "valid_days": {
      "type": "number",
      "maximum": 365,
      "minimum": 1
    },
    "tax_percent": {
      "type": "number",
      "maximum": 50,
      "minimum": 0
    },
    "business_name": {
      "type": "string",
      "maxLength": 80
    },
    "deposit_percent": {
      "type": "number",
      "maximum": 100,
      "minimum": 0
    },
    "discount_percent": {
      "type": "number",
      "maximum": 100,
      "minimum": 0
    },
    "best_markup_percent": {
      "type": "number",
      "maximum": 1000,
      "minimum": 0
    },
    "better_markup_percent": {
      "type": "number",
      "maximum": 500,
      "minimum": 0
    }
  }
}

quote_totals

Free. Totals for a quote or estimate: line amounts, subtotal, discount, tax, total, deposit and valid-until date.

read-only

Argument	Type	Description
items*	array
currency	string
valid_days	number
tax_percent	number
deposit_percent	number
discount_percent	number

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "items"
  ],
  "properties": {
    "items": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "unit_price"
        ],
        "properties": {
          "quantity": {
            "type": "number",
            "maximum": 1000000,
            "minimum": 0
          },
          "unit_price": {
            "type": "number",
            "maximum": 100000000,
            "minimum": 0
          },
          "description": {
            "type": "string",
            "maxLength": 200
          }
        }
      },
      "maxItems": 100,
      "minItems": 1
    },
    "currency": {
      "type": "string",
      "maxLength": 3
    },
    "valid_days": {
      "type": "number",
      "maximum": 365,
      "minimum": 1
    },
    "tax_percent": {
      "type": "number",
      "maximum": 50,
      "minimum": 0
    },
    "deposit_percent": {
      "type": "number",
      "maximum": 100,
      "minimum": 0
    },
    "discount_percent": {
      "type": "number",
      "maximum": 100,
      "minimum": 0
    }
  }
}

small_business_stack_report

A free/freemium software stack for a small business, one pick per need with alternatives, from freesmallbiztools.com's checked listings (vendor quote and check date). Costs $1 USDC via x402; invalid input is not charged.

read-only

Argument	Type	Description
needs	string	Extra category slugs, comma separated
free_only	boolean
team_size	number
business_type*	string

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "business_type"
  ],
  "properties": {
    "needs": {
      "type": "string",
      "maxLength": 400,
      "description": "Extra category slugs, comma separated"
    },
    "free_only": {
      "type": "boolean"
    },
    "team_size": {
      "type": "number",
      "maximum": 10000,
      "minimum": 1
    },
    "business_type": {
      "enum": [
        "service",
        "trades",
        "retail",
        "online_store",
        "creator",
        "consultant",
        "agency",
        "nonprofit"
      ],
      "type": "string"
    }
  }
}