It could end up being New Zealand's most expensive voice message - more than $350 for a personalised recording by actress and presenter Jaquie Brown.
Brown, star of the The Jaquie Brown Diaries, has loaned her voice to raise money for Starship children's hospital.
The winner of the Trade Me auction will liaise with the Starship Foundation to develop a personalised answerphone message voiced by Brown.
The auction notes say "final content remains at the discretion of Jaquie Brown", but the comedian told the Herald she would say anything, or just about.
"I welcome those weird requests. I want people to ask me to say the weirdest, most twisted stuff, because that's what makes it most interesting.