Strike transaction fee
Strike does not charge fees for its services.
The fees displayed when making an onchain transaction are the Bitcoin network fees. Onchain fees are determined by the free market. This fee is irrespective of the amount of btc being sent, if you were to send $10 or $10,000,000 worth of BTC, the fee would remain the same. Strike has no control over onchain fees.
Lightning network fees
Lightning network fees are minimal and at most will cost a few cents per transaction. We recommend using Lightning to carry out transactions where possible as there is little to no fee associated with a Lightning payment.