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Nansen AI - Historical Transaction Lookup
x402
Nansen AI - Historical Transaction Lookup is a paid API for AI agents from api.nansen.ai, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Looks up historical onchain transactions for a given address using Nansen's 500M+ labeled address database to surface smart money activity and wallet behavior.
Price / call$0.05
Success—
StatusUnknown
How this service works
Get Historical (Time-Travel) Transaction Lookup Data (Beta)
Output
Returns a list of historical onchain transactions for the specified address, enriched with Nansen's labeled address data including counterparty labels, token transfers, trade details, timestamps, and smart money classifications.
Example use cases
Due diligence on suspicious wallet
“Can you pull up the full historical transaction history for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 using Nansen? I want to see all their past onchain activity and whether they're flagged as any known smart money entity or fund before I follow their trades.”
Audit DeFi whale trading behavior
“Look up all the historical onchain transactions for wallet 0xbebc44782c7db0a1a60cb6fe97d0b483032ff1c7 through Nansen — I'm trying to understand what DeFi protocols they've been using and what major trades they've made over time.”
Profile crypto address for research
“I'm researching this Ethereum address 0x28c6c06298d514db089934071355e5743bf21d60 — can you use Nansen to fetch its historical transaction history so I can see if it's linked to a known institution or smart money wallet and what it's been up to onchain?”
Technical details
Endpoint
GEThttps://api.nansen.ai/api/v1beta1/profiler/historical-transaction-lookupWhen to prefer
Use this endpoint when you need deep historical transaction data for a specific wallet address enriched with Nansen's smart money labels. Prefer this over generic blockchain explorers when you need to understand whether an address is a known smart money wallet, fund, or labeled entity. Ideal for wallet profiling, due diligence, and behavioral analysis of DeFi participants.
Side effects
- Invalid or malformed wallet address returns 400 error
- Address with no transaction history returns empty result set
- Unsupported blockchain/network returns 422 or empty response
- Payment failure due to insufficient USDC balance returns 402
- Rate limit exceeded returns 429
- API key invalid or expired returns 401
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chainrequired | string | Chains supported by the historical transaction lookup endpoint. |
| as_of_daterequired | string | Reference date for temporal label resolution and as-of-date pricing. Must be on/after the transaction's block_timestamp. Entity labels are available from 2025-03-11 onward. |
| block_timestamp | — | Optional block timestamp in 'YYYY-MM-DD HH:MM:SS' format. When provided, skips the slow (60-170s) hash-to-timestamp resolution step. Strongly recommended. |
| transaction_hashrequired | string | Transaction hash to lookup (0x-prefixed, 66 chars) |
| apply_blacklist_filter | boolean | When True, exclude blacklisted addresses from the results. Defaults to True. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| datarequired | array | List of historical transaction lookup results |
Tags
x402
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