Exa Answer API

openapi: 3.1.0
info:
  title: Exa Agent Answer API
  version: 2.0.0
  description: Exa Agent API - subset of the Exa Public API.
servers:
- url: https://api.exa.ai
security:
- apiKey: []
- bearer: []
tags:
- name: Answer
paths:
  /answer:
    post:
      operationId: answer
      summary: Answer
      description: Performs a search based on the query and generates either a direct answer or a detailed summary with citations, depending on the query type.
      x-codeSamples:
      - lang: bash
        label: Simple answer
        source: "curl -X POST 'https://api.exa.ai/answer' \\\n  -H 'x-api-key: YOUR-EXA-API-KEY' \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n    \"query\": \"What is the latest valuation of SpaceX?\",\n    \"text\": true\n  }'"
      - lang: python
        label: Simple answer
        source: "# pip install exa-py\nfrom exa_py import Exa\nexa = Exa(api_key='YOUR_EXA_API_KEY')\n\nresult = exa.answer(\n    \"What is the latest valuation of SpaceX?\",\n    text=True\n)\n\nprint(result)"
      - lang: javascript
        label: Simple answer
        source: "// npm install exa-js\nimport Exa from 'exa-js';\nconst exa = new Exa('YOUR_EXA_API_KEY');\n\nconst result = await exa.answer(\n    'What is the latest valuation of SpaceX?',\n    { text: true }\n);\n\nconsole.log(result);"
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AnswerRequest'
      responses:
        '200':
          description: OK
          content:
            application/json:
              example:
                answer: $350 billion.
                citations:
                - id: https://www.theguardian.com/science/2024/dec/11/spacex-valued-at-350bn-as-company-agrees-to-buy-shares-from-employees
                  url: https://www.theguardian.com/science/2024/dec/11/spacex-valued-at-350bn-as-company-agrees-to-buy-shares-from-employees
                  title: SpaceX valued at $350bn as company agrees to buy shares from ...
                  author: Dan Milmon
                  publishedDate: '2023-11-16T01:36:32.547Z'
                  text: SpaceX valued at $350bn as company agrees to buy shares from ...
                  image: https://i.guim.co.uk/img/media/7cfee7e84b24b73c97a079c402642a333ad31e77/0_380_6176_3706/master/6176.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom%2Cleft&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctZGVmYXVsdC5wbmc&enable=upscale&s=71ebb2fbf458c185229d02d380c01530
                  favicon: https://assets.guim.co.uk/static/frontend/icons/homescreen/apple-touch-icon.svg
                costDollars:
                  total: 0.007
                  search:
                    neural: 0.007
              schema:
                $ref: '#/components/schemas/AnswerResponse'
            text/event-stream:
              schema:
                $ref: '#/components/schemas/AnswerStreamChunk'
      tags:
      - Answer
components:
  schemas:
    CostDollarsOutput:
      type: object
      properties:
        total:
          description: Estimated total dollar cost for the completed request. This response value is not an invoice record.
          example: 0.007
          format: float
          type: number
        search:
          description: Endpoint-dependent estimated search cost breakdown by retrieval mode. Instant, fast, and auto search responses may include neural search cost. Deep search modes may be reflected only in total.
          type: object
          properties:
            neural:
              description: Cost of neural search operations.
              example: 0.007
              format: float
              type: number
          additionalProperties: false
      additionalProperties: false
      description: Endpoint-dependent estimated dollar cost breakdown for the completed request. Billing is computed from usage counters rather than this response object.
    AnswerStreamChunk:
      description: 'Schema for each JSON payload emitted in an `/answer` server-sent event stream. Each event is emitted as `data: <json>`.'
      oneOf:
      - type: object
        properties:
          choices:
            type: array
            items:
              type: object
              properties:
                index:
                  type: integer
                  minimum: 0
                  description: Index of this streamed choice.
                delta:
                  type: object
                  properties:
                    role:
                      type: string
                      const: assistant
                    content:
                      type: string
                    refusal:
                      anyOf:
                      - type: string
                      - type: 'null'
                  additionalProperties:
                    $ref: '#/components/schemas/JsonValue'
                  description: Incremental answer content emitted by the model.
                finish_reason:
                  description: Reason this streamed choice finished, when present.
                  oneOf:
                  - type: string
                  - type: 'null'
              required:
              - index
              - delta
              additionalProperties:
                $ref: '#/components/schemas/JsonValue'
            description: OpenAI-compatible streamed completion choices with internal provider fields removed.
        required:
        - choices
        additionalProperties:
          $ref: '#/components/schemas/JsonValue'
      - type: object
        properties:
          citations:
            type: array
            items:
              type: object
              properties:
                title:
                  type: string
                  description: The title of the search result.
                  example: SpaceX valued at $350bn as company agrees to buy shares from ...
                url:
                  type: string
                  description: The URL of the search result.
                  example: https://www.theguardian.com/science/2024/dec/11/spacex-valued-at-350bn-as-company-agrees-to-buy-shares-from-employees
                  format: uri
                publishedDate:
                  description: An estimate of the creation date, from parsing HTML content. Format is YYYY-MM-DD.
                  example: '2023-11-16T01:36:32.547Z'
                  format: date-time
                  type: string
                author:
                  description: If available, the author of the content.
                  example: Humza Naveed
                  anyOf:
                  - type: string
                  - type: 'null'
                id:
                  description: The temporary ID for the document. Useful for the /contents endpoint.
                  example: https://arxiv.org/abs/2307.06435
                  type: string
                image:
                  description: The URL of an image associated with the search result, if available.
                  example: https://arxiv.org/pdf/2307.06435.pdf/page_1.png
                  format: uri
                  type: string
                favicon:
                  description: The URL of the favicon for the search result's domain.
                  example: https://arxiv.org/favicon.ico
                  format: uri
                  type: string
                text:
                  description: The full text content of each source. Only present when text contents are requested.
                  example: SpaceX valued at $350bn as company agrees to buy shares from ...
                  type: string
              required:
              - title
              - url
              additionalProperties: false
            description: Search results cited by the final streamed answer.
        required:
        - citations
        additionalProperties: false
      - type: object
        properties:
          costDollars:
            $ref: '#/components/schemas/CostDollarsOutput'
          requestId:
            type: string
            description: Unique identifier for the request.
            example: b5947044c4b78efa9552a7c89b306d95
        required:
        - costDollars
        additionalProperties: false
      - type: object
        properties:
          tag:
            type: string
            const: ERROR
          payload:
            type: object
            properties:
              error:
                type: object
                properties:
                  code:
                    type: integer
                  message:
                    type: string
                required:
                - code
                - message
                additionalProperties: false
              requestId:
                type: string
                description: Unique identifier for the request.
                example: b5947044c4b78efa9552a7c89b306d95
            required:
            - error
            additionalProperties: false
        required:
        - tag
        - payload
        additionalProperties: false
    AnswerRequest:
      type: object
      properties:
        query:
          type: string
          minLength: 1
          description: Natural-language question or instructions for the request.
          example: What is the latest valuation of SpaceX?
        stream:
          type: boolean
          description: If true, the response is returned as a server-sent events (SSE) stream.
          default: false
        text:
          type: boolean
          title: Simple text retrieval
          description: If true, returns full page text with default settings. If false, disables text return.
          default: false
        outputSchema:
          type: object
          properties:
            type:
              type: string
              description: The root schema type (typically "object").
              example: object
            properties:
              type: object
              propertyNames:
                type: string
              additionalProperties:
                $ref: '#/components/schemas/JsonValue'
              description: An object where each key is a property name and each value is a JSON Schema describing that property (with `type`, `description`, etc).
            required:
              type: array
              items:
                type: string
              description: List of required property names.
            description:
              type: string
              description: A description of the schema.
            additionalProperties:
              type: boolean
              description: Whether to allow properties not listed in `properties`.
              default: false
          additionalProperties:
            $ref: '#/components/schemas/JsonValue'
          description: A [JSON Schema Draft 7](https://json-schema.org/draft-07) specification for the desired answer structure. When provided, the answer is returned as a structured object matching the schema instead of a plain string.
      required:
      - query
    AnswerResponse:
      type: object
      properties:
        requestId:
          type: string
          description: Unique identifier for the request.
          example: b5947044c4b78efa9552a7c89b306d95
        answer:
          description: The generated answer based on search results. Returns a string by default, or a structured object matching the provided outputSchema.
          example: $350 billion.
          oneOf:
          - type: string
          - type: object
            propertyNames:
              type: string
            additionalProperties:
              $ref: '#/components/schemas/JsonValue'
        citations:
          description: Search results used to generate the answer.
          type: array
          items:
            type: object
            properties:
              title:
                type: string
                description: The title of the search result.
                example: SpaceX valued at $350bn as company agrees to buy shares from ...
              url:
                type: string
                description: The URL of the search result.
                example: https://www.theguardian.com/science/2024/dec/11/spacex-valued-at-350bn-as-company-agrees-to-buy-shares-from-employees
                format: uri
              publishedDate:
                description: An estimate of the creation date, from parsing HTML content. Format is YYYY-MM-DD.
                example: '2023-11-16T01:36:32.547Z'
                format: date-time
                type: string
              author:
                description: If available, the author of the content.
                example: Humza Naveed
                anyOf:
                - type: string
                - type: 'null'
              id:
                description: The temporary ID for the document. Useful for the /contents endpoint.
                example: https://arxiv.org/abs/2307.06435
                type: string
              image:
                description: The URL of an image associated with the search result, if available.
                example: https://arxiv.org/pdf/2307.06435.pdf/page_1.png
                format: uri
                type: string
              favicon:
                description: The URL of the favicon for the search result's domain.
                example: https://arxiv.org/favicon.ico
                format: uri
                type: string
              text:
                description: The full text content of each source. Only present when text contents are requested.
                example: SpaceX valued at $350bn as company agrees to buy shares from ...
                type: string
            required:
            - title
            - url
            additionalProperties: false
        costDollars:
          $ref: '#/components/schemas/CostDollarsOutput'
      required:
      - answer
      additionalProperties: false
    JsonValue:
      description: Any JSON value.
      oneOf:
      - type: 'null'
      - type: boolean
      - type: number
      - type: string
      - type: array
        items:
          $ref: '#/components/schemas/JsonValue'
      - type: object
        propertyNames:
          type: string
        additionalProperties:
          $ref: '#/components/schemas/JsonValue'
  securitySchemes:
    apiKey:
      type: apiKey
      name: x-api-key
      in: header
      description: 'Pass your Exa API key in the x-api-key header. You can also authenticate with Authorization: Bearer <key>.'
    bearer:
      type: http
      scheme: bearer
      description: 'Pass your Exa API key in the x-api-key header. You can also authenticate with Authorization: Bearer <key>.'