> For the complete documentation index, see [llms.txt](https://docs.nansen.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nansen.ai/api/agent.md).

# Agent

## Interact with the Nansen Research Agent in "fast" mode

> Ask the Nansen AI agent a research question and receive a streamed answer backed by on-chain data. The \*\*fast\*\* variant uses a lighter model optimised for low-latency responses.\
> \
> \*\*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.

```json
{"openapi":"3.1.0","info":{"title":"Nansen API","version":"1.0.0"},"servers":[{"url":"https://api.nansen.ai"}],"security":[{"ApiKeyAuth":[]}],"components":{"securitySchemes":{"ApiKeyAuth":{"type":"apiKey","in":"header","name":"apikey","description":"API key for authentication"}},"schemas":{"AgentResearchRequest":{"properties":{"text":{"type":"string","minLength":1,"title":"Text","description":"Research query or question for the Nansen AI agent."},"conversation_id":{"anyOf":[{"type":"string"}],"title":"Conversation Id","description":"Optional conversation ID for multi-turn interactions. Returned in the finish event of a previous response. Omit to start a new conversation."}},"type":"object","required":["text"],"title":"AgentResearchRequest","description":"Request model for Agent Research endpoints (fast and expert)."},"ErrorEnvelope":{"type":"object","required":["error","message","code","status","request_id","doc_url"],"properties":{"error":{"type":"string","description":"Human-readable error category."},"message":{"type":"string","description":"Human-readable explanation of the error."},"code":{"type":"string","enum":["missing_field","unknown_field","invalid_field_value","invalid_address_format","invalid_date_format","invalid_date_range","mutually_exclusive_fields","value_out_of_range","too_many_items","unauthenticated","forbidden","geo_blocked","plan_upgrade_required","insufficient_credits","rate_limit_exceeded","not_found","method_not_allowed","conflict","payload_too_large","query_timeout","query_too_large","upstream_unavailable","internal_error"],"description":"Stable machine-readable error code."},"status":{"type":"integer","description":"HTTP status code returned for the request."},"request_id":{"type":["string","null"],"description":"Identifier for the request, when available."},"doc_url":{"type":"string","format":"uri","description":"Link to the error-code reference documentation, anchored to this error's code."},"param":{"type":"string","description":"Request parameter associated with the error."},"retry_after":{"type":"integer","minimum":0,"description":"Seconds to wait before retrying the request."}}}},"headers":{"XNansenCreditsCost":{"description":"Quoted credit cost of this request. It is present on successful responses and errors reached after pricing, but absent when a request is rejected before pricing. A value of 0 means plan credits do not apply.","schema":{"type":"string"}},"XRequestId":{"description":"Unique identifier for this request, returned on every response. Uses the upstream-assigned request id when available; otherwise echoes a caller-supplied X-Request-Id or generates an id. Include this value in support requests.","schema":{"type":"string"}},"XNansenCreditsUsed":{"description":"Credits actually deducted for this request. Can differ from the quoted cost, for example 0 when the request was rejected.","schema":{"type":"string"}},"XNansenCreditsRemaining":{"description":"Total credits remaining in the user's account after this request","schema":{"type":"string"}},"PaymentReceipt":{"description":"Base64url-encoded MPP receipt returned on successful paid requests via Authorization: Payment","schema":{"type":"string"}},"RateLimitLimit":{"description":"Combined rate limit across all configured time windows","schema":{"type":"string"}},"RateLimitRemaining":{"description":"Number of requests remaining in the current limiting window","schema":{"type":"string"}},"RateLimitReset":{"description":"Seconds until the rate limit window resets. A delta in seconds, not a Unix timestamp.","schema":{"type":"string"}},"XRateLimitLimit":{"description":"Request limit for the most constrained app-enforced window","schema":{"type":"string"}},"XRateLimitRemaining":{"description":"Requests remaining in the most constrained app-enforced window","schema":{"type":"string"}},"XRateLimitReset":{"description":"Seconds until the most constrained app-enforced window resets. A delta in seconds, not a Unix timestamp: it is at least 1 and never exceeds the window span.","schema":{"type":"string"}},"XRateLimitLimitSecond":{"description":"Maximum requests allowed per second","schema":{"type":"string"}},"XRateLimitRemainingSecond":{"description":"Requests remaining in the current second","schema":{"type":"string"}},"XRateLimitLimitMinute":{"description":"Maximum requests allowed per minute","schema":{"type":"string"}},"XRateLimitRemainingMinute":{"description":"Requests remaining in the current minute","schema":{"type":"string"}},"PaymentRequired":{"description":"Base64-encoded x402 payment options returned on 402 responses for x402 clients","schema":{"type":"string"}},"WWWAuthenticatePayment":{"description":"MPP payment challenge returned on 402 responses, for example `Payment id=\"...\", realm=\"api.nansen.ai\", method=\"tempo\", intent=\"charge\", request=\"...\"`","schema":{"type":"string"}},"RetryAfter":{"description":"Number of seconds to wait before making a new request","schema":{"type":"string"}},"XNansenRateLimitScope":{"description":"Window that caused an enforced rate-limit rejection: `second` or `minute` for global plan windows, or `endpoint` for an endpoint-specific window. This is an open set; clients should handle unknown future values with generic rate-limit behavior.","schema":{"type":"string"}}},"responses":{"BadRequestError":{"description":"Bad Request - Invalid request parameters or malformed request","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"}}}]}}}},"UnauthorizedError":{"description":"Authentication error - No API key found in request","headers":{"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"}}}]}}}},"PaymentRequiredError":{"description":"Payment Required - This endpoint supports pay-per-request via x402 and MPP. x402 responses advertise payment options in `Payment-Required`; MPP responses advertise a fresh `WWW-Authenticate: Payment ...` challenge. Successful MPP responses may include `Payment-Receipt`.","headers":{"Payment-Required":{"$ref":"#/components/headers/PaymentRequired"},"WWW-Authenticate":{"$ref":"#/components/headers/WWWAuthenticatePayment"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"type":"object","description":"Problem-details body for x402 or MPP payment challenges."}}}},"ForbiddenError":{"description":"Forbidden - User does not have required subscription tier or has exceeded credit limit","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Nansen-Credits-Used":{"$ref":"#/components/headers/XNansenCreditsUsed"},"X-Nansen-Credits-Remaining":{"$ref":"#/components/headers/XNansenCreditsRemaining"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"}}}]}}}},"NotFoundError":{"description":"Not Found - The requested resource was not found","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorEnvelope"}}}},"ValidationError":{"description":"Validation error - Invalid request parameters","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"errors":{"type":"array","description":"Per-field request-validation errors, in the order they were detected. This field is absent from other 422 responses. The top-level error, message, and code reflect the primary error, which is not always the first entry. When a request produces an unusually large number of errors the list is truncated and a final entry reports how many were omitted.","items":{"type":"object","required":["field","message","code"],"properties":{"field":{"type":"string","description":"Path of the request field that failed validation, prefixed with its location in the request (body, query, path, header, or cookie) and including array indices. Unlike param, this path keeps the location prefix and array indices."},"message":{"type":"string","description":"Human-readable explanation of the field error."},"code":{"type":"string","enum":["missing_field","unknown_field","invalid_field_value","invalid_address_format","invalid_date_format","invalid_date_range","mutually_exclusive_fields","value_out_of_range","too_many_items"],"description":"Stable machine-readable error code."}}}}}}]}}}},"TooManyRequestsError":{"description":"Too Many Requests - Rate limit exceeded","content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"},"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}},"headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-RateLimit-Limit":{"$ref":"#/components/headers/XRateLimitLimit"},"X-RateLimit-Remaining":{"$ref":"#/components/headers/XRateLimitRemaining"},"X-RateLimit-Reset":{"$ref":"#/components/headers/XRateLimitReset"},"X-Nansen-RateLimit-Scope":{"$ref":"#/components/headers/XNansenRateLimitScope"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}}},"InternalServerError":{"description":"Internal Server Error - An unexpected error occurred","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorEnvelope"}}}},"BadGatewayError":{"description":"Bad Gateway - Upstream service unavailable","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","required":["retry_after"],"properties":{"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}}},"ServiceUnavailableError":{"description":"Service Unavailable - Service temporarily unavailable","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","required":["retry_after"],"properties":{"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}}},"GatewayTimeoutError":{"description":"Gateway Timeout - Upstream service timed out","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","required":["retry_after"],"properties":{"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}}}}},"paths":{"/api/v1/agent/fast":{"post":{"tags":["Agent"],"summary":"Interact with the Nansen Research Agent in \"fast\" mode","description":"Ask the Nansen AI agent a research question and receive a streamed answer backed by on-chain data. The **fast** variant uses a lighter model optimised for low-latency responses.\n\n**What it helps to answer:**\n\n1. **Which tokens are smart money accumulating right now?**\n2. **What is the current narrative driving activity in DeFi?**\n3. **Which wallets are connected to a specific address?**\n4. **What is the on-chain story behind a recent price move?**\n\n**SSE event types:**\n\nThe response is a `text/event-stream` with the following JSON event types:\n\n| type | payload | description |\n|---|---|---|\n| `delta` | `{\"type\": \"delta\", \"text\": \"…\"}` | Incremental text chunk of the agent's answer. |\n| `tool_call` | `{\"type\": \"tool_call\", \"name\": \"…\"}` | Emitted once per unique Nansen tool the agent invokes. |\n| `finish` | `{\"type\": \"finish\", \"conversation_id\": \"…\", \"tool_calls\": [...]}` | Final event. Contains the `conversation_id` for follow-up requests and the full list of tools used. |\n| `error` | `{\"type\": \"error\", \"error\": \"…\", \"status_code\": …}` | Emitted if the upstream agent service is unavailable or times out. |\n\nThe stream terminates with a `data: [DONE]` sentinel.\n\n**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.","operationId":"agent_fast_api_v1_agent_fast_post","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/AgentResearchRequest"}}},"required":true},"responses":{"200":{"description":"Server-Sent Events stream. Each event is a `data: {json}` line. See endpoint description for event schema.","content":{"application/json":{"schema":{}},"text/event-stream":{}},"headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"},"X-Nansen-Credits-Used":{"$ref":"#/components/headers/XNansenCreditsUsed"},"X-Nansen-Credits-Remaining":{"$ref":"#/components/headers/XNansenCreditsRemaining"},"Payment-Receipt":{"$ref":"#/components/headers/PaymentReceipt"},"RateLimit-Limit":{"$ref":"#/components/headers/RateLimitLimit"},"RateLimit-Remaining":{"$ref":"#/components/headers/RateLimitRemaining"},"RateLimit-Reset":{"$ref":"#/components/headers/RateLimitReset"},"X-RateLimit-Limit":{"$ref":"#/components/headers/XRateLimitLimit"},"X-RateLimit-Remaining":{"$ref":"#/components/headers/XRateLimitRemaining"},"X-RateLimit-Reset":{"$ref":"#/components/headers/XRateLimitReset"},"X-RateLimit-Limit-Second":{"$ref":"#/components/headers/XRateLimitLimitSecond"},"X-RateLimit-Remaining-Second":{"$ref":"#/components/headers/XRateLimitRemainingSecond"},"X-RateLimit-Limit-Minute":{"$ref":"#/components/headers/XRateLimitLimitMinute"},"X-RateLimit-Remaining-Minute":{"$ref":"#/components/headers/XRateLimitRemainingMinute"}}},"400":{"description":"Bad Request","$ref":"#/components/responses/BadRequestError"},"401":{"description":"Unauthorized","$ref":"#/components/responses/UnauthorizedError"},"402":{"description":"Payment Required","$ref":"#/components/responses/PaymentRequiredError"},"403":{"description":"Forbidden","$ref":"#/components/responses/ForbiddenError"},"404":{"description":"Not Found","$ref":"#/components/responses/NotFoundError"},"422":{"description":"Unprocessable Content","$ref":"#/components/responses/ValidationError"},"429":{"description":"Too Many Requests","$ref":"#/components/responses/TooManyRequestsError"},"500":{"description":"Internal Server Error","$ref":"#/components/responses/InternalServerError"},"502":{"description":"Bad Gateway","$ref":"#/components/responses/BadGatewayError"},"503":{"description":"Service Unavailable","$ref":"#/components/responses/ServiceUnavailableError"},"504":{"description":"Gateway Timeout","$ref":"#/components/responses/GatewayTimeoutError"}}}}}}
```

## Interact with the Nansen Research Agent in "expert" mode

> 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.

```json
{"openapi":"3.1.0","info":{"title":"Nansen API","version":"1.0.0"},"servers":[{"url":"https://api.nansen.ai"}],"security":[{"ApiKeyAuth":[]}],"components":{"securitySchemes":{"ApiKeyAuth":{"type":"apiKey","in":"header","name":"apikey","description":"API key for authentication"}},"schemas":{"AgentResearchRequest":{"properties":{"text":{"type":"string","minLength":1,"title":"Text","description":"Research query or question for the Nansen AI agent."},"conversation_id":{"anyOf":[{"type":"string"}],"title":"Conversation Id","description":"Optional conversation ID for multi-turn interactions. Returned in the finish event of a previous response. Omit to start a new conversation."}},"type":"object","required":["text"],"title":"AgentResearchRequest","description":"Request model for Agent Research endpoints (fast and expert)."},"ErrorEnvelope":{"type":"object","required":["error","message","code","status","request_id","doc_url"],"properties":{"error":{"type":"string","description":"Human-readable error category."},"message":{"type":"string","description":"Human-readable explanation of the error."},"code":{"type":"string","enum":["missing_field","unknown_field","invalid_field_value","invalid_address_format","invalid_date_format","invalid_date_range","mutually_exclusive_fields","value_out_of_range","too_many_items","unauthenticated","forbidden","geo_blocked","plan_upgrade_required","insufficient_credits","rate_limit_exceeded","not_found","method_not_allowed","conflict","payload_too_large","query_timeout","query_too_large","upstream_unavailable","internal_error"],"description":"Stable machine-readable error code."},"status":{"type":"integer","description":"HTTP status code returned for the request."},"request_id":{"type":["string","null"],"description":"Identifier for the request, when available."},"doc_url":{"type":"string","format":"uri","description":"Link to the error-code reference documentation, anchored to this error's code."},"param":{"type":"string","description":"Request parameter associated with the error."},"retry_after":{"type":"integer","minimum":0,"description":"Seconds to wait before retrying the request."}}}},"headers":{"XNansenCreditsCost":{"description":"Quoted credit cost of this request. It is present on successful responses and errors reached after pricing, but absent when a request is rejected before pricing. A value of 0 means plan credits do not apply.","schema":{"type":"string"}},"XRequestId":{"description":"Unique identifier for this request, returned on every response. Uses the upstream-assigned request id when available; otherwise echoes a caller-supplied X-Request-Id or generates an id. Include this value in support requests.","schema":{"type":"string"}},"XNansenCreditsUsed":{"description":"Credits actually deducted for this request. Can differ from the quoted cost, for example 0 when the request was rejected.","schema":{"type":"string"}},"XNansenCreditsRemaining":{"description":"Total credits remaining in the user's account after this request","schema":{"type":"string"}},"PaymentReceipt":{"description":"Base64url-encoded MPP receipt returned on successful paid requests via Authorization: Payment","schema":{"type":"string"}},"RateLimitLimit":{"description":"Combined rate limit across all configured time windows","schema":{"type":"string"}},"RateLimitRemaining":{"description":"Number of requests remaining in the current limiting window","schema":{"type":"string"}},"RateLimitReset":{"description":"Seconds until the rate limit window resets. A delta in seconds, not a Unix timestamp.","schema":{"type":"string"}},"XRateLimitLimit":{"description":"Request limit for the most constrained app-enforced window","schema":{"type":"string"}},"XRateLimitRemaining":{"description":"Requests remaining in the most constrained app-enforced window","schema":{"type":"string"}},"XRateLimitReset":{"description":"Seconds until the most constrained app-enforced window resets. A delta in seconds, not a Unix timestamp: it is at least 1 and never exceeds the window span.","schema":{"type":"string"}},"XRateLimitLimitSecond":{"description":"Maximum requests allowed per second","schema":{"type":"string"}},"XRateLimitRemainingSecond":{"description":"Requests remaining in the current second","schema":{"type":"string"}},"XRateLimitLimitMinute":{"description":"Maximum requests allowed per minute","schema":{"type":"string"}},"XRateLimitRemainingMinute":{"description":"Requests remaining in the current minute","schema":{"type":"string"}},"PaymentRequired":{"description":"Base64-encoded x402 payment options returned on 402 responses for x402 clients","schema":{"type":"string"}},"WWWAuthenticatePayment":{"description":"MPP payment challenge returned on 402 responses, for example `Payment id=\"...\", realm=\"api.nansen.ai\", method=\"tempo\", intent=\"charge\", request=\"...\"`","schema":{"type":"string"}},"RetryAfter":{"description":"Number of seconds to wait before making a new request","schema":{"type":"string"}},"XNansenRateLimitScope":{"description":"Window that caused an enforced rate-limit rejection: `second` or `minute` for global plan windows, or `endpoint` for an endpoint-specific window. This is an open set; clients should handle unknown future values with generic rate-limit behavior.","schema":{"type":"string"}}},"responses":{"BadRequestError":{"description":"Bad Request - Invalid request parameters or malformed request","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"}}}]}}}},"UnauthorizedError":{"description":"Authentication error - No API key found in request","headers":{"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"}}}]}}}},"PaymentRequiredError":{"description":"Payment Required - This endpoint supports pay-per-request via x402 and MPP. x402 responses advertise payment options in `Payment-Required`; MPP responses advertise a fresh `WWW-Authenticate: Payment ...` challenge. Successful MPP responses may include `Payment-Receipt`.","headers":{"Payment-Required":{"$ref":"#/components/headers/PaymentRequired"},"WWW-Authenticate":{"$ref":"#/components/headers/WWWAuthenticatePayment"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"type":"object","description":"Problem-details body for x402 or MPP payment challenges."}}}},"ForbiddenError":{"description":"Forbidden - User does not have required subscription tier or has exceeded credit limit","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Nansen-Credits-Used":{"$ref":"#/components/headers/XNansenCreditsUsed"},"X-Nansen-Credits-Remaining":{"$ref":"#/components/headers/XNansenCreditsRemaining"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"}}}]}}}},"NotFoundError":{"description":"Not Found - The requested resource was not found","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorEnvelope"}}}},"ValidationError":{"description":"Validation error - Invalid request parameters","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"errors":{"type":"array","description":"Per-field request-validation errors, in the order they were detected. This field is absent from other 422 responses. The top-level error, message, and code reflect the primary error, which is not always the first entry. When a request produces an unusually large number of errors the list is truncated and a final entry reports how many were omitted.","items":{"type":"object","required":["field","message","code"],"properties":{"field":{"type":"string","description":"Path of the request field that failed validation, prefixed with its location in the request (body, query, path, header, or cookie) and including array indices. Unlike param, this path keeps the location prefix and array indices."},"message":{"type":"string","description":"Human-readable explanation of the field error."},"code":{"type":"string","enum":["missing_field","unknown_field","invalid_field_value","invalid_address_format","invalid_date_format","invalid_date_range","mutually_exclusive_fields","value_out_of_range","too_many_items"],"description":"Stable machine-readable error code."}}}}}}]}}}},"TooManyRequestsError":{"description":"Too Many Requests - Rate limit exceeded","content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","properties":{"detail":{"type":"string"},"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}},"headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-RateLimit-Limit":{"$ref":"#/components/headers/XRateLimitLimit"},"X-RateLimit-Remaining":{"$ref":"#/components/headers/XRateLimitRemaining"},"X-RateLimit-Reset":{"$ref":"#/components/headers/XRateLimitReset"},"X-Nansen-RateLimit-Scope":{"$ref":"#/components/headers/XNansenRateLimitScope"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}}},"InternalServerError":{"description":"Internal Server Error - An unexpected error occurred","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorEnvelope"}}}},"BadGatewayError":{"description":"Bad Gateway - Upstream service unavailable","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","required":["retry_after"],"properties":{"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}}},"ServiceUnavailableError":{"description":"Service Unavailable - Service temporarily unavailable","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","required":["retry_after"],"properties":{"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}}},"GatewayTimeoutError":{"description":"Gateway Timeout - Upstream service timed out","headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"Retry-After":{"$ref":"#/components/headers/RetryAfter"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"}},"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ErrorEnvelope"},{"type":"object","required":["retry_after"],"properties":{"retry_after":{"type":"integer","description":"Seconds to wait before retrying"}}}]}}}}}},"paths":{"/api/v1/agent/expert":{"post":{"tags":["Agent"],"summary":"Interact with the Nansen Research Agent in \"expert\" mode","description":"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.\n\n**What it helps to answer:**\n\n1. **Which tokens are smart money accumulating right now?**\n2. **What is the current narrative driving activity in DeFi?**\n3. **Which wallets are connected to a specific address?**\n4. **What is the on-chain story behind a recent price move?**\n\n**SSE event types:**\n\nThe response is a `text/event-stream` with the following JSON event types:\n\n| type | payload | description |\n|---|---|---|\n| `delta` | `{\"type\": \"delta\", \"text\": \"…\"}` | Incremental text chunk of the agent's answer. |\n| `tool_call` | `{\"type\": \"tool_call\", \"name\": \"…\"}` | Emitted once per unique Nansen tool the agent invokes. |\n| `finish` | `{\"type\": \"finish\", \"conversation_id\": \"…\", \"tool_calls\": [...]}` | Final event. Contains the `conversation_id` for follow-up requests and the full list of tools used. |\n| `error` | `{\"type\": \"error\", \"error\": \"…\", \"status_code\": …}` | Emitted if the upstream agent service is unavailable or times out. |\n\nThe stream terminates with a `data: [DONE]` sentinel.\n\n**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.","operationId":"agent_expert_api_v1_agent_expert_post","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/AgentResearchRequest"}}},"required":true},"responses":{"200":{"description":"Server-Sent Events stream. Each event is a `data: {json}` line. See endpoint description for event schema.","content":{"application/json":{"schema":{}},"text/event-stream":{}},"headers":{"X-Nansen-Credits-Cost":{"$ref":"#/components/headers/XNansenCreditsCost"},"X-Request-Id":{"$ref":"#/components/headers/XRequestId"},"X-Nansen-Credits-Used":{"$ref":"#/components/headers/XNansenCreditsUsed"},"X-Nansen-Credits-Remaining":{"$ref":"#/components/headers/XNansenCreditsRemaining"},"Payment-Receipt":{"$ref":"#/components/headers/PaymentReceipt"},"RateLimit-Limit":{"$ref":"#/components/headers/RateLimitLimit"},"RateLimit-Remaining":{"$ref":"#/components/headers/RateLimitRemaining"},"RateLimit-Reset":{"$ref":"#/components/headers/RateLimitReset"},"X-RateLimit-Limit":{"$ref":"#/components/headers/XRateLimitLimit"},"X-RateLimit-Remaining":{"$ref":"#/components/headers/XRateLimitRemaining"},"X-RateLimit-Reset":{"$ref":"#/components/headers/XRateLimitReset"},"X-RateLimit-Limit-Second":{"$ref":"#/components/headers/XRateLimitLimitSecond"},"X-RateLimit-Remaining-Second":{"$ref":"#/components/headers/XRateLimitRemainingSecond"},"X-RateLimit-Limit-Minute":{"$ref":"#/components/headers/XRateLimitLimitMinute"},"X-RateLimit-Remaining-Minute":{"$ref":"#/components/headers/XRateLimitRemainingMinute"}}},"400":{"description":"Bad Request","$ref":"#/components/responses/BadRequestError"},"401":{"description":"Unauthorized","$ref":"#/components/responses/UnauthorizedError"},"402":{"description":"Payment Required","$ref":"#/components/responses/PaymentRequiredError"},"403":{"description":"Forbidden","$ref":"#/components/responses/ForbiddenError"},"404":{"description":"Not Found","$ref":"#/components/responses/NotFoundError"},"422":{"description":"Unprocessable Content","$ref":"#/components/responses/ValidationError"},"429":{"description":"Too Many Requests","$ref":"#/components/responses/TooManyRequestsError"},"500":{"description":"Internal Server Error","$ref":"#/components/responses/InternalServerError"},"502":{"description":"Bad Gateway","$ref":"#/components/responses/BadGatewayError"},"503":{"description":"Service Unavailable","$ref":"#/components/responses/ServiceUnavailableError"},"504":{"description":"Gateway Timeout","$ref":"#/components/responses/GatewayTimeoutError"}}}}}}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.nansen.ai/api/agent.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.