Protocol fee

The executable V10 launch configuration defaults to a 0 bps protocol fee until a separately audited fee path exists. Maker spread is still shown. If a future fee mechanism is activated, it must be visible before execution and must not be charged on a failed/aborted swap.

Maker spread

The maker's price is shown separately from the Harpocrates fee and compared with a multi-source reference index in production.

Network cost

Robinhood Chain gas is paid in ETH. Gas sponsorship/account abstraction can improve UX, but must not change the user's settlement price without disclosure.

No “zero fee” trick

Harpocrates must not advertise zero fees while embedding a hidden spread.