Yes, various off-chain cryptocurrencies can be sent to Hive Engine directly using the address of their respective SWAP representative, such as SWAP.BTC, SWAP.BCH, SWAP.DOGE, SWAP.LTC, SWAP.MATIC, just to name a few of the more notable ones. I've sent LTC directly to Hive Engine multiple times now, because it's fast and with very low fees. 😁 🙏 💚 ✨ 🤙