OK Here is a quote from fees on ARCA: Round lot orders that take liquidity from the ArcaEx Booksm in OTC, AMEXÂ® and other Tape B listed securities $0.003 per share AND Here is a quote from INET: Execution Fees For NYSE and AMEX Exchange Listed Stocks (Excluding AMEX ETFs) Executed on the INET Book: Rebate per executed share of $.0009 for trades that remove liquidity from the INET book. Charge per executed share of $.0010 for trades that add liquidity to the INET book. Here is the question. Why is ARCA charging a fee when taking liquidity from ARCA while INET is rebating for removing liquidity? Or am I reading this wrong?