TOKEN ALLOWANCE

Ethereum dApp tokens are just beginning to proliferate. And, with them, comes new standards to ensure the safe transfer of those tokens across the ecosystem. One of these new standards found in ERC20 is the Token Allowance Permission... Because the Ethereum blockchain allows transactions with smart contracts and those smart contracts can be facilitated by 3rd parties - like a DEX or Protocol Relayer - permissions have to be granted to the 3rd party by token owners before those smart contracts can execute... What is a Token allowance and how is it essential to trading over the 0x protocol.