An attacker gained admin access at an unnamed third-party vendor used to provision customer access to Nansen
Sept 2023outcome unclear- Outcome
- Data exposure, no funds lost. Affected users notified and told to reset passwords
Nansen is a crypto analytics company that attaches names and categories, known as labels, to blockchain addresses. Using those labels, it shows what funds, exchanges, whales and consistently profitable "Smart Money" wallets are buying and selling 1.
The platform launched in 2020 and is used through a web app, a mobile app, an AI agent and an API 123. As of October 2026, Nansen describes itself as moving "from analytics platform to trading company", with in-app spot and perpetuals trading routed to third-party protocols 14.
It is unrelated to the polar explorer Fridtjof Nansen.
Nansen turns raw blockchain transactions into readable activity, then lets you act on it. The work splits into four areas 23:
The about page describes these as one workflow "from discovery to execution" 1. For simpler tools that only total your own holdings, see crypto portfolio tracker.
A label is Nansen's attribution of an address: for example an exchange hot wallet, a fund, a market maker, or a wallet with a strong trading record. Nansen says it holds more than 500 million labeled addresses 13.
"Smart Money" is Nansen's own grouping of wallets it judges to be skilled or well-informed traders 2. Signals built on it, such as "Smart Money net inflow", are therefore only as good as the attribution behind them.
Labels are Nansen's analysis, not verified identities. Nansen's terms also say AI features can produce outputs that are "inaccurate" or "lack context" 4. Treat both as research inputs, not instructions.
As of October 2026, Nansen offers two plans, Free and Pro 5. There is no enterprise tier.
| Free | Pro | |
|---|---|---|
| Price | $0 | $69/month, or $49/month billed annually 6 |
| Data | Limited | All chains; full PnL and labels including Smart Money 6 |
| Alerts, portfolios, custom labels | Limited | Unlimited, subject to fair use 6 |
| AI agent | — | 2,000 agent credits per week (Academy) 6 |
| API credits | 100 one-time trial credits, then a daily top-up to 10 7 | Included allowance with a monthly top-up 7 |
API credits. Extra credits cost $10 per 10,000, with bulk discounts above 5 million 5. Each endpoint has a fixed price 7:
Plan changes and refunds. Remaining time on a plan does not roll over when you switch 5. The terms say there are no refunds on account termination unless stated otherwise 4.
Nansen does not publish trading-fee rates on the pages reviewed. The homepage says loyalty "Points" tiers "unlock lower fees" 2, so check the fee shown before confirming a trade.
Nansen's terms describe every service as non-custodial: Nansen does not hold your assets 4.
Where features are restricted 4:
| Scope | Restricted in |
|---|---|
| All services | Singapore, Bhutan's Gelephu Mindfulness City, Cuba, Iran, North Korea, Syria, and Crimea, Donetsk and Luhansk |
| Perpetuals | Additionally the United States and the United Kingdom |
| Outcomes | Additionally the US, UK, Australia and several other countries |
For automated strategies built on signals like these, see crypto trading bots.
A Nansen account is tied to an email or a connected wallet. Connecting a wallet links its address and on-chain history to your account under Nansen's privacy policy 4.
The main risks:
Nansen launched its analytics platform in 2020, focused first on Ethereum 18. In December 2021 it raised $75 million in a round led by Accel, with a16z, Tiger Global, GIC and SCB 10X. Investors put the valuation at about $750 million 89. The company was Singapore-based at the time 8. Its current terms name the "Nansen group" as operator and select the law of Bhutan's Gelephu Mindfulness City, while Singapore itself is a restricted jurisdiction 4.
No other security incidents were found in the sources reviewed (as of October 23, 2026).
Hacks in DefiLlama’s public database are also scored as the security record on the Nansen rating page.
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