Crypto markets largely maintained gains on the week, supported by Ethereum and the US Securities and Exchange Commission's approval of spot exchange-traded funds.

However, approximately $1.4 billion in notional value of Bitcoin option contacts will expire on May 24.

The expiration of the 21,000 contracts is a relatively minor event compared to the May 31 month-end that will cause $4.3 billion worth of options to expire, according to Deribit.