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isEven API
(isevenapi.xyz)
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Oh, bummer, my number isn't supported by the free version:
https://api.isevenapi.xyz/api/iseven/8764389587485736749956772984692357867345989845699872561/
Just divide that number by two until it's small enough to make the request under the free version.
pretty sure that has to be against their TOS
/s
That's against the terms of math :-)