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Yes, I probably won't go down the road of usernames because my site would be subject to attack.
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If I wasn't obvious in my previous post: yes anyone would be insane to give their login details to anyone else.
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So if the API won't offer past payments fur the miner, then that info won't be offered. But I still will be able to offer alerts for miner problems which is also valuable. So could I use my hash rate and kano payment to compute other miners payments based on the hash rate ratios that their miners generated?
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An API for rewards may exist some time in the future, but it is certainly not a priority, there are much more important things being done, required to be done, and planned to be done.
But polling an API for rewards would also be pointless - since the API would only change once every time we find a block.
You known when blocks occur.
You can even work that out without even accessing the web site or the pool or even mining.
I do at home for IRC and my own notifications, though of course the pool gives me notifications as well, but the more obvious point is that any site that shows blocks that is in any way useful also knows who finds the blocks by the majority of the pools by looking at the coinbase transaction when a block change occurs.
But, the math you use to calculate information is up to you.