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Nansen AI Agent (Fast)
x402
Nansen AI Agent (Fast) is a paid API for AI agents from api.nansen.ai, paid per call via x402, $2/call, status unknown (last checked 2026-09-14).
Streams AI-generated research answers backed by Nansen's on-chain data, using a low-latency model optimised for fast responses
Price / call$2
Success—
StatusUnknown
How this service works
Interact with the Nansen Research Agent in "fast" mode
Output
A server-sent event (SSE) stream consisting of: incremental delta text chunks forming the AI answer, tool_call events naming each Nansen data tool the agent used, and a final finish event containing the conversation_id for follow-up requests and a full list of all tools invoked. On failure, an error event is emitted with details.
Example use cases
Example prompt
“Ask Nansen which tokens smart money wallets have been accumulating over the last 48 hours, using the fast model for a quick answer.”
Technical details
Endpoint
GEThttps://api.nansen.ai/api/v1/agent/fastWhen to prefer
Use this fast variant when you need rapid on-chain research answers with lower latency and can accept a lighter model. Prefer this over the standard agent endpoint when response speed matters more than maximum depth of analysis. Choose Nansen specifically when the question requires wallet labelling, smart money flow data, or DeFi narrative intelligence backed by Nansen's proprietary on-chain dataset.
Side effects
- Invalid or malformed research question returns an error SSE event
- Network timeout during streaming may truncate the response mid-stream
- Rate limiting or payment failure (x402) returns a 402 response before streaming begins
- Ambiguous queries may produce a low-confidence or incomplete answer
- Missing conversation_id for a follow-up may break context continuity
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
{}Tags
x402
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