The initial charge for a taxi, bus, or train ride, before distance or time-based additions. Common in transportation contexts.
The taxi's base fare is 500 yen.
How much is the minimum fare for this bus?
運賃 is a general term for transportation fare, while 初乗り料金 specifically refers to the initial minimum charge.
基本料金 is a broader term for a basic rate or flat fee, not limited to transportation.
Compound of 初乗り (first ride) + 料金 (fee). The exact historical derivation is uncertain, but the term is straightforwardly formed from its components.