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Webster 1913 Edition

Adj.

Capable of being funded, or converted into a fund; convertible into bonds.

fundable ‎(comparative more fundable, superlative most fundable)

Able to be funded; deserving of funds.
- 2009 August 28, Yudhijit Bhattacharjee, “Warning: Don't Let Your Elders Brainwash You”, in Science, volume 325, number 5944, DOI:10.1126/science.325_1060:
  It's like telling them, "Here is this primer, this cookbook—all you have to do to come up with a fundable proposal is read this well."