Interactive Brokers. Their API is great. TWS is a bit frustrating but I hardly use it.
they don’t do pfof. How were you able to study the execution.
Interactive Brokers. Their API is great. TWS is a bit frustrating but I hardly use it.
they don’t do pfof. How were you able to study the execution.
%%Hidden Cost of Free Trading? $34 Billion a Year, Study Says
https://finance.yahoo.com/news/hidden-price-no-fee-trading-160021808.html


The actual trading cost-per-trade is the sum of commission, exchange fees, spread, and slippage. Some "costs" get disguised among those. "Everybody along the way" needs to "get paid" to stay in business... and they all do. So... costs can overwhelm attempts at scalping... should playing for bigger moves.
I'm not going to write an academic paper here with all the details but the high level version is that I wrote software to send orders at identical times to both IB and TD and compare total costs. Sometimes TD was over $100 higher cost when spending just $5,000. These were trades for volatile equities with high trade volume at the time. You obviously won't see such big discrepancies when trading something like SPY.
To do this right you need a trade size that is taking more than the lit liquidity at NBBO. Citadel and other PFOF firms basically get you because the SEC allows them to trade with you based on displayed bids/offers yet there is tons of dark liquidity at NASDAQ and the other large exchanges.
%%the biggest cost is
the cost of
being
w
r
o
n
g
try being right , it helps. see my posts for guidance
I get great fills with fidelity, within .01 for virtually everything, for trades up to 500 shares, with no commish..... huge savings (I'd spent 33k on commishes in the 18 months prior to zero-commish pricing)