Uniswap is an open source decentralized exchange protocol built on the Ethereum blockchain and operating under the management of smart contracts. Uniswap leaves behind the traditional architecture of the digital exchange, since there is no order book. The protocol works with the design of Constant Product Market Maker, which is a variant of the model called Automated Market Maker (AMM).

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Uniswap

Permit2 is a smart contract that safely shares and manages token approvals across other contracts to create a more unified, cost-efficient, and safer UX.

Learn how to integrate with Permit2 here 👇
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