I have a question about fees. They are very different across different blockchains.
Example, ethereum and solana fee is about 1.7%


But bitcoin fee is way higher, 2.7%

Can't you normalize these fees? Bitcoin fee 1.7% like the others would be amazing. I have been using other services for bitcoin for this reason.
This is not mining fee difference
There is no reason for such difference. Bitcoin mining fees are much lower than ethereum's for example.
Thanks for asking this important question about blockchain fees - it's a common point of confusion and we appreciate the opportunity to clarify.
Swap fees for BTC are currently around 2.5%, plus the base network fee.
Swap fees for ETH, SOL are around 1.5%, plus the base network fee.
Reasons why Bitcoin network fees are higher:
First, Bitcoin prioritizes decentralization and security over speed/cost. Its fixed 1MB block size (versus Solana's 50,000 TPS) naturally creates fee pressure during peak demand.
While Ethereum's base fees have dropped after the merger, Bitcoin miners' incentives are still tied to competing for transactions. We have no control over this - it's the price of Bitcoin being the most secure blockchain.
And we are currently actively looking to work with solutions (such as the Lightning Network) to significantly reduce Bitcoin fees. Fees may go down.
We never want fees to force you to look elsewhere. We can customize solutions for you if needed. Thank you for your support.