It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that once the Prophet (peace and blessings be upon him) had cupping done and gave the cupper his wage. If this wage had been unlawful, the Prophet (peace and blessings be upon him) would never have given it.
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 3286
Hadith Gradingحکم دارالسلام:صحيح، لكن الإسناد الأول فيه الحجاج بن أرطاة مدلس وقد عنعن، والثاني مرسل