ValueError: An API token is required to verify contract source code. Visit https://etherscan.io/ to obtain a token, and then store it as the environment variable $ETHERSCAN_TOKEN

[mohzourob]

why this happened?

[cromewar]

Hello @dash7ou you need to create a etherscan account and get an API key, than you must add that API key to your .env file. Otherwise the contract will not be verified.

[mohzourob]

I know that for mainnet but for kovan ?

[cromewar]

Yes sir, in order to verify any contract on you must have an API key, for mainnet and also for all public testnest (you can use the same one on all)

[mohzourob]

Oh got it, thx. @cromewar