As of now, STMX is not available on Coinbase. However, there is a possibility that it could be added in the future as Coinbase has been known to add new assets from time to time.
NOTE: Warning: STMX is not currently available to buy on Coinbase. Any websites or services claiming to offer STMX for sale on Coinbase are likely fraudulent and should be avoided. To purchase STMX, please contact a reliable and authorized third-party exchange.
If you are looking to invest in STMX, you can do so through another exchange such as Binance.