Exchange Issuance Bounty [December 2020] - IN PROGRESS

Product Engineering
1

The Index Coop wishes to deploy a smart contract that enables a user to purchase or sell an index product in a single transaction using decentralized exchange liquidity (e.g. Uniswap/Sushiswap). It is advised that you take inspiration from DeFi Pulse’s arb bot, which has much of the logic for issuance and on-chain DEX trades.

Specification:

  • Should allow using the best price via sushiswap or uniswap for each purchase
  • Should allow payment or receiving using an erc20 or Ether
  • Should allow issuance or redemption using the BasicIssuanceModule of any Index or Set token

Successfully completing this bounty requires:

  • Writing smart contract code in solidity, writing unit tests, and writing deployment scripts
  • Code to be reviewed and audited by the Set engineering team
  • Code is ultimately deployed into production

Bounty: 400 INDEX

Implementor: Currently being implemented by @ncitron and @alphaguy

6 Likes
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Must all computation be done on-chain (e.g. picking uni vs sushi)?

Should they optimize the tx for lowest gas or best price?

1 Like
3

1 - Yep - on chain

2 - Best Price

1 Like
4

I might give this bounty a try. Any tips on how I should deal with the leftover dust due to the uni/sushi trades? Maybe there could be a boolean argument for it to either be swapped back to ETH and sent back to the user, or to be donated to the coop (which I imagine many people will opt to do since the additional gas cost may not be worth it).

2 Likes
5

I believe it is possible to get exact amounts out of a uniswap/sushi trade, so there will not be dust. That said, you may need to send more of the payment token than expected.

Ping me on discord and we discuss more!

6

Your right. Looks like swapETHForExactTokens is what I am looking for. I’ll ping you on Discord if I have any other questions.