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

# Calculate Cost of Carry

> Calculate the annualized cost of carry - the net cost of holding the underlying asset until futures expiry. Cost of carry includes financing costs, storage costs, and income (dividends, coupons). The relationship is: Futures = Spot × e^(carry × time). Understanding carry is essential for futures pricing, cash-and-carry arbitrage, and basis trading strategies. The sign indicates contango (positive) or backwardation (negative). [Tier: STANDARD, Credits: 2]



## OpenAPI

````yaml api-specs/solver.json post /quantlib/solver/finance/carry
openapi: 3.1.0
info:
  title: FinceptQuantLib API - Solver
  description: >-
    Solver module endpoints for FinceptQuantLib API. The Solver module (Basic
    Tier, 1 credit per request) provides advanced financial solvers including
    bond analytics (yield, duration, convexity), implied volatility
    calculations, spread computations (Z-spread, ASW, OAS), curve bootstrapping,
    interest rate conversions, and model calibration (Vasicek, CIR). Essential
    for fixed income analysis, derivatives pricing, and risk management.
  version: 3.0.0
  contact:
    name: Fincept API Support
    url: https://fincept.in
servers:
  - url: https://api.fincept.in
    description: Fincept API Production Server
security:
  - APIKeyHeader: []
tags:
  - name: quantlib-solver
    description: >-
      Advanced financial solvers for bond analytics, implied volatility, spread
      calculations, and model calibration
    x-displayName: Solver
paths:
  /quantlib/solver/finance/carry:
    post:
      tags:
        - quantlib-solver
      summary: Calculate Cost of Carry
      description: >-
        Calculate the annualized cost of carry - the net cost of holding the
        underlying asset until futures expiry. Cost of carry includes financing
        costs, storage costs, and income (dividends, coupons). The relationship
        is: Futures = Spot × e^(carry × time). Understanding carry is essential
        for futures pricing, cash-and-carry arbitrage, and basis trading
        strategies. The sign indicates contango (positive) or backwardation
        (negative). [Tier: STANDARD, Credits: 2]
      operationId: carry
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - spot
                - futures
                - time_to_expiry
              properties:
                spot:
                  type: number
                  description: Current spot price
                  example: 100
                futures:
                  type: number
                  description: Futures price
                  example: 102.5
                time_to_expiry:
                  type: number
                  description: Time to futures expiry in years
                  example: 0.5
            example:
              spot: 100
              futures: 102.5
              time_to_expiry: 0.5
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    example: true
                  data:
                    type: object
                    properties:
                      carry:
                        type: number
                        description: Annualized cost of carry as a decimal
                        example: 0.0494
              example:
                success: true
                data:
                  carry: 0.0494
        '401':
          $ref: '#/components/responses/UnauthorizedError'
        '402':
          $ref: '#/components/responses/InsufficientTierError'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: array
                    items:
                      type: object
      security:
        - APIKeyHeader: []
components:
  responses:
    UnauthorizedError:
      description: Authentication information is missing or invalid
      content:
        application/json:
          schema:
            type: object
            properties:
              detail:
                type: string
                example: Invalid API key
    InsufficientTierError:
      description: API tier insufficient for this endpoint
      content:
        application/json:
          schema:
            type: object
            properties:
              detail:
                type: string
                example: Endpoint requires Basic tier or higher
  securitySchemes:
    APIKeyHeader:
      type: apiKey
      in: header
      name: X-API-Key
      description: >-
        API key for authentication. Get your key at
        https://api.fincept.in/auth/register

````