# Services from publishing-calc.x402tookit.com on Zero

> publishing-calc.x402tookit.com serves 9 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/publishing-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/publishing-calc.x402tookit.com/health.json

## Services

- [Publishing Calc: Full Paperback Cover Size Calculator](https://www.zero.xyz/c/publishing-calc-full-paperback-cover-size-calculator-d80ef46a/llms.txt): $0.02/call via x402. Calculates full paperback cover width and height (with bleed) from trim size and page count, returning dimensions in inches, mm, and pixels.
- [Publishing Calc: Audiobook Running Time from Word Count](https://www.zero.xyz/c/publishing-calc-audiobook-running-time-from-word-count-fd6c0ae7/llms.txt): $0.02/call via x402. Calculates estimated audiobook running time (in hours and clock format) from a manuscript word count using a configurable narration pace.
- [Publishing Calc: Page Count from Word Count](https://www.zero.xyz/c/publishing-calc-page-count-from-word-count-9de087c2/llms.txt): $0.02/call via x402. Calculates the number of printed pages from a manuscript word count, including text pages, even-page-rounded total, and physical sheet count.
- [Publishing Calc – Silent Reading Time](https://www.zero.xyz/c/publishing-calc-silent-reading-time-26162ff2/llms.txt): $0.02/call via x402. Calculates the silent reading time for a given word count at a specified words-per-minute rate, returning results as minutes and as hours:minutes:seconds.
- [Publishing Calc – Standard US Trade Book Trim Sizes](https://www.zero.xyz/c/publishing-calc-standard-us-trade-book-trim-sizes-1fbdfbd5/llms.txt): $0.02/call via x402. Returns a table of standard US trade book trim sizes in inches and mm, or looks up a specific size and its nearest standard equivalent.
- [Publishing Calc: Chapter Word Balance](https://www.zero.xyz/c/publishing-calc-chapter-word-balance-5bb73ed2/llms.txt): $0.02/call via x402. Splits a total word count evenly across N chapters, returning exact per-chapter word counts, page counts, and reading times.
- [Publishing Calc: Print Book Royalty Calculator](https://www.zero.xyz/c/publishing-calc-print-book-royalty-calculator-0102c3b7/llms.txt): $0.02/call via x402. 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.
- [Publishing Calc – Print Book Spine Width Calculator](https://www.zero.xyz/c/publishing-calc-print-book-spine-width-calculator-694c962c/llms.txt): $0.02/call via x402. Calculates print book spine width in both inches and millimeters from page count and paper type (white, cream, or color), or from a custom per-page thickness override.
- [Publishing Calc – Ebook File Size Estimator](https://www.zero.xyz/c/publishing-calc-ebook-file-size-estimator-5d6a1bd8/llms.txt): $0.02/call via x402. Estimates ebook file size in KB and MB from word count, image count, average image size, and adjustable compression/overhead parameters.

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

- [Zero catalog index](https://www.zero.xyz/llms.txt)