A simple contract allowing one to vend a token for a set rate against another token.

Three variants of the vending machine contract are provided:

• Mint: mints the vended token on demand; requires the vending machine contract to have minting privileges on the token to be vended.
• Transfer: transfers vended tokens from the vending machine contract; requires the vending machine contract to hold a sufficient balance of the token to be vended.
• TransferFrom: transfers vended tokens from a third-party vendor; requires the vending machine contract to have a sufficient allowance of the token to be vended.

The vending machine contracts also include a sweepTokens() function, allowing the owner to sweep any ERC20 tokens accidentally sent directly to the vending machine.

A vendable token contract is also provided, code for this was generated using wizard.openzeppelin.com.

All contracts are WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

This project is licensed under LGPLv3.