Amidase involved in auxin biosynthesis (Probable). Converts indole-3-acetamide (IAM) to indole-3-acetate, and phenyl-2-acetamide (PAM) to phenyl-2-acetate. Substrate preference is PAM > IAM (PubMed:27135507). a monocarboxylic acid amide + H2O = a monocarboxylate + NH4(+) Optimum pH is 7.5. Optimum temperature is 27 degrees Celsius. Belongs to the amidase family.