In Jainism there isn’t a mantra that guarantees or directly brings “big money.” Jain practice centers on detachment from material wealth, ethical conduct, and spiritual purification. Wealth, like all worldly things, is considered a result of karma and right effort, not something a special chant can reliably provide.

If you’re looking for a traditional Jain mantra for purification and remembrance of right path, the Navkar Mantra is central. It isn’t a money-mantra, but it supports spiritual aim and steady conduct. You can read more about it here