Coinbase transactions are usually irreversible １ー８３１ー（４０１）ー６８００ once submitted. However １ー８３１ー（４０１）ー６８００, some bank transfers or scheduled buys may be canceled before processing. Always verify details carefully. Contact Coinbase Support if you need help １ー８３１ー（４０１）ー６８００ with a mistaken transaction.