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Ethereal Hackathon Bounty: AdEx: Uniswap fork with SafeERC20
adexnetwork
JavaScript, Solidity
**Challenge description:**
[Uniswap](https://uniswap.io/) is revolutionary - it showed us that it's possible to build an efficient and user friendly exchange on Ethereum by making the right design decisions.
However, it's smart contracts were [built in vyper](https://github.com/Uniswap/contracts-vyper) - which is not a bad thing, but coupled with the a [popular bug in many erc20 contracts](https://github.com/Uniswap/contracts-vyper/issues/2), means it's not usable for a lot of 2017 erc20 tokens, including [ADX](https://etherscan.io/token/0x4470bb87d77b963a013db939be332f927f2b992e)
The challenge is to build a uniswap version in solidity (perhaps based on https://github.com/PhABC/uniswap-solidity) that uses our own https://github.com/AdExNetwork/adex-protocol-eth/blob/master/contracts/libs/SafeERC20.sol library
This would come in handy to exchange ADX to ETH and vice versa; it should be able to interoperate with Uniswap itself, probably by wrapping the factory+registry - using the solidity-based market contracts for buggy ERC20 tokens and using the uniswap markets for non-buggy
More links:
https://twitter.com/phabcd/status/1101672268189581312?s=21
https://github.com/PhABC/uniswap-solidity/issues/1
https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
**Submission requirements:**
* Uniswap smart contracts that work with SafeERC20
* should be ABI compatible with uniswap itself
* should have comprehensive tests
**Submission deadline:**
* April 30
**Judging criteria:**
* Best submission
* Correctness and security
* gas-efficient and well designed solidity contracts
* contributions to other open-source packages will be appreciated
**Judging date:**
* April 30
**Bounty:**
* 300 DAI
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