Why do you grab current diff instead of diff for every block since last poll?
And explorers are unreliable. I'll have to run more nodes

Because they are down randomly
Explorer API provides all the required commands though.

How do you use pools? YIIMP does not give any data to calculate profit.
Maybe if you take average from all points on estimate chart you can get something close to reality, but it will be discrete values of current diff and current price taken on large intervals, so the same as getting diff regularly and an average price for a day. I was doing this before, but realized that pool owners can just write whatever they want for these estimates, even manual values that they update once a week
And also data that pool provides has luck of that particular pool applied to it, comparing random stuff is not productive. At least avg diff based values are not affected by luck, it applies after and cannot be predicted.

Hi! Do you have some pools list on the Whattomine web page? We'll be glad to be added.
We are uCrypto.net multipool with low fees and cryptocoin variety - 18 coins based on the Ethash and Equihash algorithms.

I am not really looking for advertisers, they usually come to me if they need an ad placed.
I think all baikal stock is bought instantly,but it seems there is support.. so maybe I just couldn't find it before.

So, how that STRAKS test went?) I'm running nodes for new coins and then switch to WTM when they appear there, generally WTM avg diff is 0.5-5% higher than the real one.
The only exception is STRAKS where it's always 20-25%. Considering 5-10% or even more can be wasted on some random things during mining, it can be closer to reality, but still it's not right.
I prefer correct values and then you can apply -10% if you want it to be more realistic and not theoretical.

https://api.straks.info/v2/charts/difficulty?days=1
All blocks for the last 24h, easy

How do you calculate weighted average? What blocks are more important than others?)

If there are many blocks with low diff then next there will be blocks with much higher diff.
Difficulty basically defines the expected number of hashes to mine a block, if nethash finds block faster or slower than target spacing then diff is adjusted accordingly.
If diff retargeting is working correctly, simple average of all diffs will give very accurate number of hashes on a long interval. And 24 hours is pretty long, hundreds or even thousands of blocks.

You are polling diff each N minutes, what is your avg called? Absolutely random?

BitcoinZ hardforked to a new algo.

Please add Dubaicoin(dbix) on whattomine, it is 100% legit project..
At the moment dbix is most profitable coin..
Palmex exhchange got license from central bank of Bahrain, and dbix is a part of arabianchain team and palmex.
New version of API v2 will be added by the end of next month..

https://news.bitcoin.com/crypto-exchange-approved-regulatory-sandbox-license-bahrain/