Do hosts pay money?

With rare exception, no.  WWOOFing is about the exchange of your work helping the host with the work he / she does, in return for all meals, accommodation, to be welcomed as a family member, and the learning.
WWOOF Japan  Honcho 2-jo, 3-chome 6-7, Higashi-ku, Sapporo, 065-0042  JAPAN
E-mail: Contact Form   Fax number from within Japan: (03) 4496-6370    Fax number from outside Japan: +81 3 4496-6370

WWOOF Japan LLP (Limited Liability Partnership)