Du'a using Allah's Name As-Samad

اللَّهُمَّ يَا صَمَدُ يَا مَنْ يَقْضِي حَوَائِجَ النَّاسِ اقْضِ حَوَائِجَنَا وَحَقِّقْ أَمَانِيَّنَا وَفَرِّجْ كُرُبَاتِنَا

Allahumma ya Samadu ya man yaqdee hawa'ijan naasi iqdi hawa'ijana wa haqqiq amaniyyana wa farrij kurubaatina

O Allah, The Eternal, O You who satisfies the needs of people, satisfy our needs, grant our wishes, and ease our hardships.

A general supplication, not a narration from the Prophet (peace be upon him).