Nansen API
On-chain analytics API with proprietary wallet labeling — identifies 'smart money' wallets (profitable traders, early adopters, whales, institutional funds) and their blockchain activity. Provides token flows, wallet profiling, NFT analytics, and DeFi protocol metrics with Nansen's wallet intelligence layer on top. Premium data layer not available from raw blockchain data.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HTTPS enforced. Enterprise API with contract-based access. Proprietary wallet intelligence is a competitive asset — data handling agreements likely required for enterprise contracts.
⚡ Reliability
Best When
You're building sophisticated DeFi agents that need wallet intelligence, smart money tracking, and on-chain behavioral analytics that raw blockchain data doesn't provide.
Avoid When
You're a small team or startup — Nansen's pricing is enterprise-grade. Use Dune Analytics or The Graph for self-service on-chain analytics at lower cost.
Use Cases
- • Track smart money wallet activity (which tokens top traders are buying/selling) for agent alpha generation in DeFi trading strategies
- • Query wallet labels (exchange hot wallet, VC fund, smart money trader) for any Ethereum address to identify counterparty types in agent analysis
- • Monitor token inflows/outflows to exchanges for agent early warning of potential price pressure (exchange inflows = potential selling)
- • Analyze NFT holder profiles (what percentage held by smart money vs retail) for agent NFT valuation research
- • Access DeFi protocol TVL, liquidity mining activity, and token holder distribution analytics for agent protocol research
Not For
- • Developers who need a free or low-cost option — Nansen is expensive enterprise pricing, not developer-friendly
- • Teams that need only basic price and market cap data — CoinGecko or Messari are cheaper for basic metrics
- • Non-EVM chains (Solana, Cosmos, etc.) — Nansen is primarily focused on EVM chains though expanding
Interface
Authentication
API key passed as apiKey query parameter or Authorization header. Enterprise API access requires contacting Nansen sales. API keys are provisioned per account with rate limits based on contract.
Pricing
API access is not self-serve — requires contacting Nansen sales. Pricing is not fully public. Primarily enterprise pricing. No free trial for API — limited trial via UI product.
Agent Metadata
Known Gotchas
- ⚠ API access requires custom enterprise contract — agents cannot self-serve API access; must go through Nansen sales process
- ⚠ Wallet labels are proprietary to Nansen — agents may disagree with classifications; always treat as probabilistic signals, not ground truth
- ⚠ Smart money definitions are Nansen's proprietary algorithm — the methodology is not fully transparent
- ⚠ Blockchain coverage is primarily EVM chains — Solana, Cosmos, and other chains have limited or no support
- ⚠ Data freshness varies by endpoint — some metrics update daily, others in near-real-time; check endpoint documentation for update frequency
- ⚠ Rate limits are contract-defined and not publicly documented — agents must implement conservative rate limiting by default
Alternatives
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Scores are editorial opinions as of 2026-03-07.