Yes, good question. It was a “swap” done by first selling BCH to a stablecoin that was paired with both, probably BUSD, and then buying ONE. I hate the 10-day lock for ACH with BinanceUSD. That’s why I did this method of sending BCH even though it requires additional steps & hassle.
If you have a Coinbase account, here’s another option. Coinbase let’s you withdraw up to $1000 without waiting. So, you can deposit via ACH to Coinbase then withdraw to BinanceUS, where you can then trade for ONE. Just pick a fast, low-fee coin supported by both for transfer between the exchanges. BCH is okay. XLM is probably another good choice. I haven’t tried this method, but I (randomly) was thinking of it earlier today — so good timing with the question!