My two cents. Worth at least a nickel (I hope).
According to Wikipedia, “my two cents” is a United States idiomatic expression taken from the original English expression ‘to put in my two pennies worth’ or ‘my two-penn’orth’. It is used to preface the tentative stating of one’s opinion, because by deprecating the opinion to follow (suggesting its value is only two cents), the user of the phrase hopes to lessen the impact of a possibly contentious statement, showing politeness and humility.