Translate the rate into a round trip
The promotion lists 0.01% maker and 0.025% taker fees. Suppose a position opens for $4,000 notional and closes at the same notional, both as taker fills. The two fills cost $1 each: $2 total, versus $4 at the stated 0.05% base taker rate. This deliberately simple example excludes price movement and account-specific tiers.
The saving depends on executed notional. Posting a smaller margin balance does not shrink the amount on which the fee is calculated.
Funding follows a different clock
Ondo settles funding hourly between opposing positions. It is separate from exchange execution revenue. A position held over several hourly boundaries can therefore generate cash flows even if no new order is placed.
For a hypothetical $4,000 position paying 0.01% per hour for six settlements, funding totals $2.40. This is an assumed rate, not a current quote. It illustrates why a $2 fee saving can be smaller than a holding cost. Record the actual signed funding payments rather than assuming the funding direction stays constant.
Check the account before applying a headline rate
The fee page allows lower rates for account tiers or individual arrangements and treats spot pricing separately. Eligibility also remains a separate question: the onboarding guide excludes the United States, Panama and other prohibited jurisdictions.
Before comparing venues, use the same position size, entry type, exit assumption and holding period. Otherwise a cheaper-looking comparison may simply be measuring a different trade.
Compare the estimate with the fills
Keep the fee estimate with the trade record, then compare it with the amount actually charged. Separate a change in the rate from a change in executed size. That small distinction makes it easier to spot whether an unexpected cost came from the promotion, your order type or the position itself.