Nansen AI Expert Agent

x402

Nansen AI Expert Agent is a paid API for AI agents from api.nansen.ai, paid per call via x402, $7.5/call, status unknown (last checked 2026-10-12).

Streams a deep, multi-step on-chain research answer from Nansen's expert AI agent, backed by wallet labels and smart money flow data

Price / call$7.5

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StatusUnknown

How this service works

Ask the Nansen AI agent a research question and receive a streamed answer backed by on-chain data. The **expert** variant uses a more capable model for deeper, multi-step analysis. **What it helps to answer:** 1. **Which tokens are smart money accumulating right now?** 2. **What is the current narrative driving activity in DeFi?** 3. **Which wallets are connected to a specific address?** 4. **What is the on-chain story behind a recent price move?** **SSE event types:** The response is a text/event-stream with the following JSON event types: | type | payload | description | |---|---|---| | delta | {"type": "delta", "text": "…"} | Incremental text chunk of the agent's answer. | | tool_call | {"type": "tool_call", "name": "…"} | Emitted once per unique Nansen tool the agent invokes. | | finish | {"type": "finish", "conversation_id": "…", "tool_calls": [...]} | Final event. Contains the conversation_id for follow-up requests and the full list of tools used. | | error | {"type": "error", "error": "…", "status_code": …} | Emitted if the upstream agent service is unavailable or times out. | The stream terminates with a data: [DONE] sentinel. **Fast vs Expert:** Use /agent/fast for quick factual lookups and simple questions. Use /agent/expert when you need deeper multi-step analysis or synthesis across multiple data sources.

Output

A server-sent events (SSE) stream with incremental text chunks (delta), tool_call events naming each Nansen data tool invoked, and a final finish event containing a conversation_id for follow-up questions plus the complete list of tools used. The full streamed text constitutes a narrative on-chain research answer.

Example use cases

Example prompt

“Use Nansen's expert AI agent to do a deep analysis — which tokens are smart money wallets most aggressively accumulating in the last 48 hours, and what's the on-chain narrative driving that activity?”

Technical details

Endpoint

GEThttps://api.nansen.ai/api/v1/agent/expert?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need deep, multi-step on-chain research that synthesizes wallet labels, smart money flows, and DeFi analytics into a narrative answer. Prefer over the standard Nansen agent when the question requires complex reasoning across multiple data sources. Best for investigative questions about wallet relationships, accumulation patterns, or narrative-driven price analysis.

Side effects

Invalid or missing question body returns an error SSE event
Rate limit or quota exceeded returns error event
Payment not settled via x402 results in 402 Payment Required
Ambiguous or unanswerable on-chain question may return a partial or low-confidence answer
SSE stream interrupted mid-response if network drops

Input

Schema · Request body

Field	Type	Description
textrequired	string	Research query or question for the Nansen AI agent.
conversation_id	—	Optional conversation ID for multi-turn interactions. Returned in the finish event of a previous response. Omit to start a new conversation.

Output

Schema · Response

{}

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