Those of us with less than $10k have been live trading with Robinhood. With the pending Quantopian shutdown, it is evident that any alternative means for algorithmic trading is not going to include a connection with Robinhood.
Although workarounds supposedly exist, I researched Interactive Brokers to see if it is possible to switch instead.
1) The minimum deposit is $10k, but after that, there is no minimum balance. Feel free to withdrawal $ back out after opening the account.
2) How to get around the T+3 (soon to be T+2), similar to Robinhood instant. Open a margin account with IB, and you'll get the same benefits, and even better benefits as RH Instant provides (except for the immediate availability of $1k on deposits).
3) The minimum balance with a margin account is $2k.
I personally spoke with a representative about these items.