> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dev.gojinko.com/llms.txt
> Use this file to discover all available pages before exploring further.

# exchange price

> Price a specific exchange offer

Get the exact fare difference and penalty for a specific exchange option from [`exchange shop`](/api/exchange/shop) before committing.


## OpenAPI

````yaml api-reference/public-api.yaml POST /v1/exchange_price
openapi: 3.0.0
info:
  title: Jinko Public API
  version: 0.1.0
  description: >-
    Curated public REST surface for Jinko. Authenticated with jnk_ API keys. See
    https://docs.gojinko.com for guides.
servers: []
security: []
paths:
  /v1/exchange_price:
    post:
      tags:
        - Post-booking
      summary: Price a specific exchange offer
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ExchangePriceRequest'
      responses:
        '200':
          description: Price a specific exchange offer
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ExchangePriceResponse'
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: BAD_REQUEST
                  message: Malformed JSON in request body.
                  doc_url: https://docs.gojinko.com/concepts/errors
        '401':
          description: Authentication required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: AUTH_REQUIRED
                  message: Invalid or expired API key.
                  doc_url: https://docs.gojinko.com/api-reference/authentication
        '422':
          description: Validation error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: BAD_REQUEST
                  message: >-
                    origins: origins is required; trip_type: trip_type is
                    required
                  doc_url: https://docs.gojinko.com/concepts/errors
        '429':
          description: Rate limit or quota exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: RATE_LIMITED
                  message: Rate limit or quota exceeded.
                  doc_url: https://docs.gojinko.com/concepts/errors
        '502':
          description: Upstream service error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: UPSTREAM_ERROR
                  message: Upstream travel provider returned an error. Please retry.
                  doc_url: https://docs.gojinko.com/concepts/errors
      security:
        - ApiKeyAuth: []
        - BearerAuth: []
components:
  schemas:
    ExchangePriceRequest:
      type: object
      properties:
        booking_ref:
          type: string
          example: JNK-A0AUR2
        last_name:
          type: string
          example: Carrard
        ticket_numbers:
          type: array
          items:
            type: string
        provider:
          type: string
        intent:
          $ref: '#/components/schemas/IntentInput'
        offer_id:
          type: string
      required:
        - booking_ref
        - last_name
        - offer_id
      example:
        booking_ref: JNK-A0AUR2
        last_name: Carrard
        offer_id: exch_offer_3c1a9f
    ExchangePriceResponse:
      type: object
      properties:
        payment_outcome:
          type: string
          example: additional_payment_due
        fare_difference:
          type: object
          properties:
            value:
              type: number
              example: 318.4
            amount:
              type: number
            currency:
              type: string
              example: USD
            decimal_places:
              type: integer
              example: 2
        penalty_amount:
          type: object
          properties:
            value:
              type: number
              example: 318.4
            amount:
              type: number
            currency:
              type: string
              example: USD
            decimal_places:
              type: integer
              example: 2
        total_due:
          type: object
          properties:
            value:
              type: number
              example: 318.4
            amount:
              type: number
            currency:
              type: string
              example: USD
            decimal_places:
              type: integer
              example: 2
        total_refund:
          type: object
          properties:
            value:
              type: number
              example: 318.4
            amount:
              type: number
            currency:
              type: string
              example: USD
            decimal_places:
              type: integer
              example: 2
        session_reference:
          type: string
          example: exch_7a1c93f0
        expires_at:
          type: string
          example: '2026-06-01T13:04:56Z'
        warnings:
          type: array
          items:
            type: string
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
            doc_url:
              type: string
          required:
            - code
            - message
      required:
        - error
    IntentInput:
      type: object
      properties:
        user_intent:
          type: string
          nullable: true
          description: >-
            The user's natural-language intent: the Alpic PII-stripped
            paraphrase when available, else a best-effort fallback to the
            client-provided NL query.
          example: find a cheap flight to Tokyo
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
    BearerAuth:
      type: http
      scheme: bearer

````