Even though the phrase is now somewhat outdated, in English “I’d like to add my tupp’orth to the debate” – meaning “I’d like to add a few thoughts of my own…” The phrase literally means (colloquially) “my tuppenny worth”, i.e. a man, a lawyer, etc. What is two penny pieces of money?

What would be the nearest equivalent? (It doesn’t necessarily have to be a phrase involving coinage – I’m just looking for a widely-used idiom.)