NFT Yield Farming on BSC

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【Introduction of the NFT Yield Farming on BSC】

• This is a smart contract that enable a user to farm yield by staking LP tokens (BEP20) into a NFT pool.
  • Once a user stake LP tokens into a NFT pool, reward token (Governance Token) are mined every block.
  • User who staked can receive the Governance Tokens as rewards (as farmed-yield) when that user un-stake.
• This smart contract works on BSC (Binance Smart Chain).

 

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【Workflow】

• Diagram / Workflow
  

 

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【Setup】

① Install modules

• Install npm modules in the root directory

$ npm install

② Add .env to the root directory.

• Please copy code of .env.example into your .env (Then, please input your information of wallets, private keys, etc... by following code of .env.example ) https://github.com/supercoolx/NFT-Yield-Faming-Contract/blob/main/.env.example

③ Compile contracts (on BSC testnet)

$ npm run compile:bsc-testnet

④ Test

• Execute test of the smart-contracts (on the BSC testnet)
  • [Note]: Sometime, timeout happen on this test. So I recommend that you try ⑤ Script below instead of this test.

$ npm run test:nft-yield-farming_bsc-testnet
($ truffle test ./test/test-bsc/NFTYieldFarmingOnBSC.test.js --network bsc_testnet)

⑤ Script

• Execute script of the smart-contracts on the BSC testnet (with truffle exec command)

$ npm run script:nft-yield-farming_bsc-testnet
($ truffle exec ./scripts/script-bsc/NFTYieldFarmingOnBSC.script.js --network bsc_testnet)

(※ Note: In advance, please check whether your deployer' wallet address on BSC testnet has enough BNB balance or not)

 

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【Remarks】

• When 503 Error happen, please select a new BSC RPC Endpoints to change by referencing the list below https://docs.binance.org/smart-chain/developer/rpc.html ↓
• Then, please replace BSC RPC Endpoints for 2 files below.
  • truffle-config.js https://github.com/supercoolx/NFT-Yield-Faming-Contract/blob/main/truffle-config.js#L9
  • NFTYieldFarmingOnBSC.script.js https://github.com/supercoolx/NFT-Yield-Faming-Contract/blob/main/scripts/script-bsc/NFTYieldFarmingOnBSC.script.js#L5

• Governance Token
  • At the moment, Governance Token is used as a reward token.
  • Although it has not implemented yet, I will implement Governance Token for governance strucure (e.g. Governance Token holders can vote, etc...) in the future.

• LP tokens
  • LP token is created by BEP20.
  • Assuming LP tokens is a pair between the Governance Token and BNB.
  • But, pool to create this pair (LP tokens) has not been implemented yet. (at the mement)

• Version
  • Solidity (Solc): v0.6.12
  • Truffle: v5.1.60
  • web3.js: v1.2.9
  • openzeppelin-solidity: v3.2.0

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【References】

• BSC
  • Getting Started with BSC: https://binancex.dev/blog.html?p=making-the-move-from-ethereum-to-bsc
  • BSC blockchain explorer https://explorer.binance.org/smart-testnet
  • BSC testnet faucet https://testnet.binance.org/faucet-smart
  • BSC smart contract IDE http://remix.ethereum.org/#optimize=false&runs=200&evmVersion=null&version=soljson-v0.7.4+commit.3f05b770.js
  • BSC development ecosystem and tools https://github.com/binance-chain/bsc-develop-ecosystem/
  • BSC FAQ https://docs.google.com/document/d/1JF_P-AokXhSe38bNqLTNhlhKIu0JrcNRVReGdoBA-0o/edit?usp=sharing

• BSC
  • BEP20Token.template: https://github.com/binance-chain/bsc-genesis-contract/blob/master/contracts/bep20_template/BEP20Token.template

• BSC RPC Endpoints:
  https://docs.binance.org/smart-chain/developer/rpc.html