OTC Pools: 1% of the buy transactions from the pool.
OTC Packages: 1% of the list price when the package is sold.
There is a service fee of 0.001 ETH to create an OTC record. This nominal fee is to deter the spam creation of OTC Packages and Pools.
Package to Package Trading: As each package does not have a base monetary value to calculate a percentile fee, the platform fee for package to package trading is a static amount on each chain paid by the user accepting a trade offer.
Ethereum: 0.01 ETH