Here is a detailed list of top paying google adsense keywords from financial sector. This is probably the best paying niche along with medical field. The data is obtained directly from google's tools itself. But no claims are made about the accuracy of the data, due to the volatile nature of the adwords keyword bidding.
consolidation of debt $19.33
second mortgages $19.28
tax attorney $19.13
phoenix loan $19.08
balance transfer credit cards $19.06
canada credit cards $18.99
texas loan $18.96
graduate student loan $18.91
chase credit $18.90
student loan calculator $18.89
best insurance $18.74
allstate insurance $18.69
credit debt consolidation $18.67
consumer credit counseling $18.58
airline credit card $18.52
credit card application $18.40
insurance young $18.36
0 apr credit cards $18.33
mortgage loan company $18.24
FINANCIAL KEYWORDS 15