Back in November we laid out the v0 API endpoint deprecation timeline. In that plan, we noted that the v0 API would become read-only at the end of the Embiggen Airdrop, and would be dropped completely at the end of January. However, once the orders from the Embiggen Airdrop expired, the v0 orderbook was empty. Rather than continuing to host an empty, read-only orderbook for the remainder of the month, it will be disabled on January 7th.