Any suggestions for doing this?
If you can't do this; if you sell too early or too late, your return will potentially be a lot less than picking the high price after the fact.
In other words, the stated returns are maximized assuming perfect clairvoyance --- which no one has. Basing return on closing price assumes zero clairvoyance --- which the average person has --- and is thus a more realistic measure.
The metrics are as they are because, right now[0], there are no better options to validate how Feetr performed. These values are, like you say, theoretical maximums and have not been matched by humans in almost a year. You get the top every so often but not consistently.
However, I wouldn't say that this makes the service less useful than people think. I have made 700% returns and this allowed me to quit my job and work on Feetr full time. Other beta testers have made more than their salary using this.
[0] As above, there will be an investment service offered at some point
All data is 100% available on feetr.io after market close and, when it launches, Monday will be given for free on Reddit, Twitter, and to anyone who has a free tier account at feetr. Monthly subscription will be $8.99.
It's easy to pick the high/sell price for the day after the day is over. Predicting this on the fly is a whole lot trickier. It's very unlikely you will catch the day's high. Unless you're psychic, you'll probably sell either too early or too late with diminished returns..
The concept that I try to push is to focus on compound interest. To start with a small amount and just keep rolling it over into (near) daily profits. Don't try to time the top, sell when you're comfortable.
I would offer it for free but I believe that it's immoral (and potentially illegal) for me to be able to invest in the stocks when it launches, and so I've priced it at a point that I think people can justify. I tried to match Netflix on price, but they increased it so now I can say I'm cheaper than them.
If investing on Monday is making people more than $9 then it's worth it to subscribe, and if it isn't then I need to rethink the algorithm.
Great marketing here, the tool is so good that it would be "immoral/illegal" for the creator to use it.
But when it launches, I have a competitive advantage over everyone using the service and that doesn't sit right with me.
And I appreciate that a lot, however I prefer monthly billing to ensure that subscribers are never locked into the service.
With the above, you'd think that a trading bot would be a piece of cake. The easiest part of the process, probably. As of right now, I've found that it's hard to model intuition using code. It's easy to watch a graph and say "I think it's about time to sell", but it's hard to give that understanding to a computer. I do believe that it's a problem that can be solved, and certainly you can look at Aladdin[1] as a system that has been very successful in this space.
Don't take negativity as a reason to not do something though. If you're passionate and interested, then go prove everyone wrong.
[0] "per day" references per day that Feetr finds a stock
[1] https://www.blackrock.com/aladdin