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I don't know anything about Abra @joshman so I couldn't say, but I do believe that the Flexa Network would require some sort of smart contract as well as staking of Flexacoin. I imagine that the limitation of how much could be spend via a certain wallet's client base would be determined by how much they have staked. Now I don't truly know if this is how it works but I believe so:
Wallet/app creator stakes $1 Million in Flexacoin and wallet/app user base has $1 Million dollars to spend...I imagine if there is price fluctuation then the spending limit flows with it.

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