FYI I thought TradeMe was down since Sunday, but it turns out that my pihole, specifically the list https://nsfw.oisd.nl has blocking TradeMe.

It must've been fixed already as after an update, TradeMe is no longer blocked:

hal@pihole:~ $ pihole -q trademe.co.nz
 Match found in https://nsfw.oisd.nl:
   ||trademe.co.nz^
hal@pihole:~ $ pihole -g

....lists updating....

hal@pihole:~ $ pihole -q trademe.co.nz
  [i] No results found for trademe.co.nz within the adlists