Miracle’s sources
Miracle invents no figure. Rules come from Kindle Direct Publishing’s official help pages; your sales, costs and keyword lists come from your own files and what you paste; Amazon’s data, only from the official APIs you authorise.
Official KDP help
- Metadata Guidelines for Books · G201097560Title + subtitle under 200 characters; words forbidden in keywords; what a description may not contain (reviews, price, time-sensitive information, links, phone…).
- Keywords · G201298500Seven keywords; what to avoid (brands, other authors, “free”, Kindle Unlimited, quotation marks…); titles over 60 characters skimmed.
- Book description · G201189630HTML tags allowed in a description.
- KDP Categories · G200652170Three categories; Amazon publishes no machine-readable list, and Miracle does not make one up.
- Paperback royalty · G201834330Royalty rates for paperbacks and hardcovers.
- Royalties and marketplaces · G201834340Marketplaces without print distribution.
- Paperback printing cost · G200644210Printing cost per page and per book.
- Hardcover printing cost · G200634500Hardcover printing cost.
- eBook royalties · G20063456035% and 70% options, delivery costs.
- Digital book pricing · G201645450Price ranges and tax included in the price.
- Prices for Amazon Japan · G201849770Japanese tax on prices.
- Paperback cover · G201857950Dimensions, bleed, spine, page limits per paper.
- Hardcover cover · G200645690Hardcover dimensions and margins.
- Advanced Macintosh Techniques · G200735140KDP page cited for eBook file size.
Amazon data
Miracle reads neither Amazon’s web pages nor the suggestions of its search box. Amazon’s data comes only through the official APIs (Selling Partner API, Amazon Ads API), when you connect and authorise your account. The keyword lists analysed in “Pasted list” are the ones you paste: the search terms of your ads reports, your notes; no figure there is a search volume.
Exchange rates
The European Central Bank’s daily reference rates. Each amount is converted at the rate of the day it was earned (the last one published before, for a weekend or holiday). With no published rate, the amount stays out of the totals and the day is named. No rate is ever estimated. Every 6 hours Miracle checks those days again and adds them as soon as the ECB publishes the rate. ECB reference rates · feed used (90 days)
What Miracle does not do
No estimated search volume, no sales estimated from rank, no opportunity score: no model published by Amazon allows them. The lists of well-known marks and authors are reminders, not a trade-mark register search.