1.
billing; charging a fee
imposing or collecting fees for a service
利用時間に応じて課金される。
You are charged based on usage time.
月額課金のサービスだ。
It's a monthly subscription service.
従量課金制で料金が決まる。
The fee is determined by usage-based billing.
2.
in-app purchase; microtransaction
paying for items or features within a game or app
ゲームに課金しすぎた。
I spent too much on in-app purchases in the game.
課金しないと強くなれない。
You can't get stronger without paying.
無課金で遊んでいる。
I play without spending any money.
FORMATION:
課 (impose, assign) + 金 (money) → impose money/charges
VERB FORM:
課金する (to charge, to bill; to make in-app purchases)
RELATED COMPOUNDS:
- 課金制 (fee-based system)
- 従量課金 (usage-based billing)
- 月額課金 (monthly billing)
- 無課金 (free-to-play without paying)
- 廃課金 (excessive in-app spending - slang)
- 微課金 (light spending - slang)
MODERN USAGE:
The word has gained a new colloquial meaning in gaming culture, referring specifically to in-app purchases in mobile/online games. "課金する" can mean "to pay real money in a game," often for gacha (loot box) systems or premium items.