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In case you think it can be interesting to add to pylivetrader, I've created a new backend to paper trade with alpaca not using the Polygon API. It is useful in case you can't get a live trading account.
I've also added an example algo that uses this paper trading backend. It's a long mean reversion algorithm.
You might not be interested it merge the whole code but at least wanted to comunicate the idea that having a paper trading backend for non live trading accounts can be useful for some users.