Synonym for "financial power"

Solution 1:

An often used word for financial power is means.

2 Money; financial resources

‘he came from a family of very modest means’

2.1 Wealth.

‘exclusive hotels that are priced so that only people of means can stay’

‘You have had the means under your control for quite some time now.’

2.2 Resources; capability.

‘every country in the world has the means to make ethanol’

https://www.lexico.com/en/definition/means

The other expression often used is wherewithal, defined as:

The money or other means needed for a particular purpose.

‘they lacked the wherewithal to pay’

‘They don't have the money or the wherewithal to want to slam him on environment.’

‘All have the wherewithal to pay a premium for the quality of home life York offers.’

‘A gusher of cash flow is giving businesses the wherewithal to increase their capital outlays.’

‘Since he lacks the financing to build, he lacks the wherewithal to complete his side of the contract.’

https://www.lexico.com/en/definition/wherewithal

Solution 2:

Wealth & Influence or a confluence of the two in an order that suits your needs. Usually the standard parts of speech in relating countries. eg: China's expansive influence has been bought by its Wealth and deep pockets.