There's nothing fishy about the apk he posted. If u aren't on sprint and wanna use Google wallet u have to get it off the web. Its called side loading and is safe. My aunt uses it on her att s3.
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I understand how side loading works, and have side loaded apps on my One right now. Saying side loading is safe as a blanket statement is completely inaccurate, because someone could modify the code to send your information to them (especially risky in an app like this where you will be loading it with credit card info) and you would be none the wiser. Side loading
is safe as long as you know the .apk you are side loading comes from a trusted developer, hence my inquiries into this .apk and request for a link to the XDA thread he got it from. On top of that, developers usually like to get credit for their work, so it is more polite to post a link to their thread then to take their .apk and repost it without any acknowledgement of where you got it. Thirdly, most of the time I download an apk file, its file extension is .apk, not .zip, though I have on rare occasions downloaded them as .zip and changed their file extension to .apk manually, but again, instructions regarding that would be great, and the XDA thread again would be helpful.