The Collaborative International Dictionary of English v.0.48:
Keyage \Key"age\, n. [OF. caiage, F. guayage. See 1st Key, Quay.] Wharfage; quayage. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Quayage \Quay"age\, n. [F.] Wharfage. [Also keyage.] [1913 Webster]Bouvier's Law Dictionary, Revised 6th Ed (1856):
KEYAGE. A toll paid for loading and unloading merchandise at a key or wharf.