Error: Transaction failed. Unexpected token '<', "<. DOCTYPE ". is not valid JSON.
04 Aug 2023, 04:46
Error: Transaction failed. Unexpected token '<', "<!DOCTYPE "... is not valid JSON
A Metamask experimental feature (their sever is down for that service) is causing the issue some of you are having doing various tasks. Please turn this off and things should work as normal.
Go to MM settings>experimental>OpenSea + Blockaid (Beta) and turn it off.