I believe there's a positive correlation between stable coins issuance and BTC's(and other coins) price appreciation. Or shortly put, to me the rising levels of stable coins represent increased levels of buying power (and adoption) waiting on the sidelines.
Here, I am taking the total market cap of all stable coins and dividing it by the total crypto market cap to get a ratio. Note, only ~85% of all stable coins are calculated (rest are not on TV), however, it should still be a fairly good representation. Some of the stable coins are already locked in smart contracts for yield farming and what not. I'd also say, there's interesting 2-year long channel that's developing currently. That said, take this indicator with a grain of salt as we still have a limited set of data.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.