。
I'm counting on you.
Literal
Asked-[emphasis-ぞ].
頼んだ is the past tense of 頼む ('to ask, request, rely on'), used in this context as a fixed conversational closer meaning 'I'm counting on you / I'm leaving it to you.' ぞ is the masculine assertive particle — emphatic, often used by men in casual speech to mark certainty or warning.