Is there a different NFA assessment fee for futures contracts that have a very small notional value?

Yes. At its May 2012 meeting, the Board adopted an Interpretive Notice to NFA Bylaw 1301(b) entitled NFA's Assessment Fee-Diminutive Notional Value Contracts and Security Futures Products to impose a reduced NFA assessment fee upon diminutive notional value (DNV) futures contracts. The NFA assessment fee rate for DNV contracts is $0.00008 per round-turn, with a minimum fee of $0.01 per round-turn. The Interpretive Notice futher permits the Executive Committee upon application by a contract market or exempt commercial market to designate contracts as DNV contracts. Refer to the list of designated DNV contracts.