# Publishing Calc: Print Book Royalty Calculator

> Publishing Calc: Print Book Royalty Calculator is a paid API for AI agents from publishing-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Calculates print book royalty per copy from list price, printing cost, and royalty rate, plus break-even list price and optional total royalty for a given number of copies.

## Facts

- Endpoint: GET https://publishing-calc.x402tookit.com/print-royalty?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/publishing-calc-print-book-royalty-calculator-0102c3b7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Yjll4Z-0AZX44sgvlYhtT

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability publishing-calc-print-book-royalty-calculator-0102c3b7
```

Example prompt: My paperback has a list price of $18.99, printing costs $4.85 per copy, and my royalty rate is 60% — can you calculate my royalty per copy, my break-even price, and how much I'd make in total if I sell 300 copies using the list model?

## When to prefer this

Use this endpoint when you need a precise, formula-based royalty calculation for a print book — especially when you have a specific list price, per-copy printing cost, and royalty rate in hand and want both per-copy and total royalty figures along with break-even analysis. Prefer this over manual calculation or generic spreadsheet tools when building a publishing workflow agent or helping authors evaluate pricing decisions quickly.

## Known failure modes

- Missing required queryParams (listPrice, printCost, royaltyRate) returns an error
- Royalty rate entered as a decimal (e.g. 0.60) instead of percent (60) may yield unexpected results
- List price lower than printing cost will produce a negative or zero royalty per copy
- Invalid model value (not 'list' or 'net') may fall back to default or return an error
- Non-numeric values for numeric fields will cause a validation failure

## How this service works

Print book royalty per copy from list price, printing cost and royalty rate, plus break-even price and total.

## Output

Returns royalty per copy (exact and rounded), total royalty for the specified number of copies, break-even list price, author share as a percent of list price, the royalty model used, and a summary. May include disclaimer and degraded flag if inputs are unusual.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "listPrice",
      "printCost",
      "royaltyRate"
     ],
     "properties": {
      "model": {
       "type": "string",
       "description": "list (default): rate x list - printing cost; net: rate x (list - printing cost)"
      },
      "copies": {
       "type": "number",
       "description": "Copies sold, for a total (default 1)"
      },
      "listPrice": {
       "type": "number",
       "description": "Retail list price"
      },
      "printCost": {
       "type": "number",
       "description": "Printing cost per copy (from your printer's calculator)"
      },
      "royaltyRate": {
       "type": "number",
       "description": "Royalty percent, for example 60"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "copies": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "listPrice": {
       "type": [
        "null",
        "number"
       ]
      },
      "modelUsed": {
       "type": [
        "null",
        "string"
       ]
      },
      "printCost": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
  
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/publishing-calc-print-book-royalty-calculator-0102c3b7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from publishing-calc.x402tookit.com](https://www.zero.xyz/host/publishing-calc.x402tookit.com/llms.txt)