According to Onchain Lens, Nansen subscriptions are offered at $69 per month or $49 per month with a 1-year plan, plus an additional 10% discount on all plans (source: Onchain Lens on X, Dec 12, 2025). The post directs users to nsn.ai/OnchainLens to claim the offer and urges immediate action with the message 'Don’t miss out - grab it today' (source: Onchain Lens on X, Dec 12, 2025). The announcement does not specify an end date, indicating timing details are not provided in the post (source: Onchain Lens on X, Dec 12, 2025).