• Y : Finance

• Segmented market with limited edition marketing strategy.
• To be used in your own sole brand or sold to direct user to be used into competitors brands with patents.
• Limited Edition : Exclusive : Precious

• Answer : Hardware wallet

Hardware wallets are better solution than other.
Therefore, to get a better level of security, the use of a hardware wallet is recommended.
The problem is, hardware wallet prices are not affordable to the general public.
Just like a security key that can be placed in a smartphone directly, I think it is also possible for hardware wallet. ( may be a form of sim card or sd card ? or completely new form ? )
But on condition that it is ejectable slot / with a kill power switch, so it can be turned off when not in use.
Similar to the security key, this card also has a companion application, where all the advantages of hardware wallet can be applied.
With this hardware wallet can easily make micro payment transaction.

( not detailed enough but I'm pretty sure I've covered the bigger picture here )