People are so quick to believe anything. That is not my ETH address. This is ridiculous post your ETH address here I will buy $20 ETH and send it to you so everyone can see
If this address is not yours, is the proof that OP is giving false or not? Since you said you would pay $20, this case would be over.
But still one thing remains here and that is if you don't take any kind of money from him then why would you pay to OP? By proving the right information, you can prove to yourself that you did not scam OP. I will wait to hear your answer.