daily wages; payment by the day
Refers to wages calculated and paid on a daily basis, as opposed to monthly or hourly pay. Common in part-time or temporary work contexts.
This job pays daily wages, and you get cash every day.
I'm looking for a part-time job that pays by the day.
Compound of 日 (hi, 'day') and 払い (harai, 'payment'), from the verb 払う (harau, 'to pay').