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X Callisto: Amazon KDP author data
As of Nov 6, 2026, X Callisto has 112 books on Amazon, 14 of them on a best-seller list in the last 30 days (best rank #28), mostly in Science Fiction, Polyamory.
| Median price | $2.99 |
|---|---|
| Price range (middle 50%) | $2.99 – $2.99 |
| Median reviews | 18 |
| Total reviews | 4,276 |
| New listings (30 days, incl. new editions) | 9 |
| Breakout books (30 days) | 3 |
What stands out
- Only 12% of the catalog charted in the last 30 days; sales rest on a few titles.
- Median price $2.99, 40% below the median of their main category, Science Fiction.
- 9 new listings in the last 30 days (new editions included), 3 of them broke into a Best Sellers list.
X Callisto's best-ranked books
-
Milked by the Alien Scientist: An Erotic Hucow Sci-Fi Short Story (Alien Hucow Heat)
by X Callisto
- Price$2.99
- Rating4.4
- Reviews15
- Published2026-10
-
The Chieftain's Milkmaid: A Viking Hucow Erotic Novella (Milk of the Valkyries Book 1)
by X Callisto
- Price$0.99
- Rating4.4
- Reviews13
-
Claimed by the Alien Gladiator: An Erotic Hucow Sci-Fi Short Story (Alien Hucow Heat)
by X Callisto
- Price$2.99
- Rating5.0
- Reviews3
- Published2026-11
-
Mated to the Alien Bull: An Erotic Hucow Sci-Fi Short Story (Alien Hucow Heat)
by X Callisto
- Price$2.99
- Rating4.0
- Reviews33
-
Fresh Cream: A Why Choose Hucow Romance (Milk for the Minotaurs Book 1)
by X Callisto
- Price$2.99
- Rating3.5
- Reviews514
-
Taken by the Tentacle Creature: An Erotic Hucow Sci-Fi Short Story (Alien Hucow Heat)
by X Callisto
- Price$2.99
- Rating4.3
- Reviews25
- Published2026-08
-
Possessed by my Demon: A Short and Spicy Demonic Romance (Demon Fated Mates)
by X Callisto
- Price$0
- Rating4.2
- Reviews266
- Published2025-09
-
Deal with my Demon: A Short and Spicy Demonic Romance (Demon Fated Mates)
by X Callisto
- Price$0
- Rating4.0
- Reviews247
- Published2025-09
-
Milked on the Ranch: A Erotic Hucow Farm Short Story (Hucow Milk Maids - Hucow Sanctuary Ranch)
by X Callisto
- Price$0
- Rating3.8
- Reviews177
- Published2023-12
-
The Minotaur's Fertile Claim: A Spicy Hucow Monster Romance (Myths and Milk Monster Romance Book 1)
by X Callisto
- Price$0
- Rating3.8
- Reviews176
- Published2025-07
Main categories
FAQ
How many books does X Callisto have on Amazon?
KDPTop tracks 112 of their books; 14 made an Amazon list in the last 30 days.
Which categories does X Callisto publish in?
Their books chart most often in Science Fiction, Polyamory.
How does X Callisto price their books?
The median price is $2.99; half of the books cost $2.99–$2.99.
Has X Callisto released new books recently?
9 new books in the last 30 days, 3 of which reached a Best Sellers list.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.