Why do you even ask. It's an acronym ending in interface(s). You're not doing USAes or WMDes so don't do APIes
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Plurals of words ending with an "-i" sound are all spelled this way. "Spy" -> "spies", "fly" -> "flies", "API" -> "APIes"
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API is the plural, the singular is APUS
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TWOPI
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Mmmm... A pie....
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what about APIi
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I maintain the correct plural is "APIae" but then again I'm the sort of person who insists the plural of "box" is "boxen".
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apey eyes

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