You could possibly give to Cornell Fund for the Library [1] and tell them it's for arXiV. (Don't know if this is true for Cornell, but my own alma mater will a

You could possibly give to Cornell Fund for the Library [1] and tell them it's for arXiV. (Don't know if this is true for Cornell, but my own alma mater will accept and confirm arbitrary earmarks, even on small donations. It encourages more donations, and it doesn't actually mess with their priorities because money is fungible.) [1] https://alumni.library.cornell.edu/content/give-library https://alumni.library.cornell.edu/content/give-library