read the coinbase connect guide — can i really paper trade with no key?

morning all, coffee number two and i'm poking at the crypto side for the first time. So I went through the coinbase setup walkthrough on here last night and the bit that surprised me is that market data needs no key at all. Just connect and quotes flow. I genuinely assumed I'd be generating credentials before I could even see a chart, so that was a nice surprise for a sleepy tuesday. What I'm not clear on is how far that gets me. The guide says you can record, backtest and run paper strategies without ever making a key, and only add the CDP thing when you actually want orders to go out. My question for anyone who's done it: is the paper fill behaviour on the keyless connection actually representative, or am I building habits on a fantasy? Because with equities I've noticed my paper fills are... optimistic, let's say. And crypto order books are a different animal entirely, especially the ten level depth thing it mentions. Also a smaller thing. Spot symbols look like BTC-USD but perps have that whole -PERP-INTX suffix. If I record data on spot and later want to run the same logic on the perp, is that just a symbol swap or am I going to trip over something dumber than that? Would rather ask now than find out at 6am with a strategy live. Anyway, nice to see a guide that says "this takes five minutes" and then actually takes about five minutes. Rare.