> ## Documentation Index
> Fetch the complete documentation index at: https://docs.0xmonaco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Open Interest

> Open interest for a perp market.



## OpenAPI

````yaml /proto-openapi/api/openapi.yaml get /api/v1/market/pairs/{tradingPairId}/open-interest
openapi: 3.0.3
info:
  title: Monaco Protocol API
  description: REST API for the Monaco Protocol hybrid CLOB exchange.
  version: 1.0.0
servers:
  - url: https://staging.apimonaco.xyz
    description: Staging server (Testnet)
security: []
tags:
  - name: AccountsService
  - name: ApplicationsService
  - name: AuthService
  - name: BuildercodeRewardsService
  - name: CopyTradingService
  - name: DelegatedAgentsService
  - name: FaucetService
  - name: FeesService
  - name: HealthService
  - name: ManagedMarketsService
    description: |-
      Wallet-authenticated maker assignments. The signed session must match both
       configured maker user and application. Owner IDs are process fences, never auth.
       Only wallet sessions are supported; delegated-agent sessions receive 403.
  - name: MarginAccountsService
    description: |-
      Current public isolated-margin semantics:
       - a user has one parent margin account per application scope
       - opening orders create or reuse isolated position buckets under that parent
       - parent account creation is handled internally by margin workflows
  - name: MarketService
  - name: OrderbookService
  - name: OrdersService
  - name: PositionsService
    description: |-
      Current public isolated-margin semantics:
       - positions link to a parent margin account and, when applicable, a bucket id
       - opening orders create or reuse isolated position buckets under the parent
       - users can open another isolated position by reusing the parent account with a different market bucket
  - name: PulseService
  - name: SweeperService
  - name: TraderCodeService
  - name: TradesService
  - name: WhitelistService
  - name: WithdrawalsService
paths:
  /api/v1/market/pairs/{tradingPairId}/open-interest:
    get:
      tags:
        - MarketService
        - Market
      summary: Open Interest
      description: Open interest for a perp market.
      operationId: get_open_interest
      parameters:
        - name: tradingPairId
          in: path
          required: true
          schema:
            type: string
            default: 893d2add-2f36-4ee7-b660-893d2add2f36
          example: 893d2add-2f36-4ee7-b660-893d2add2f36
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetOpenInterestResponse'
        '404':
          description: Trading pair not found
        '500':
          description: Internal server error
components:
  schemas:
    GetOpenInterestResponse:
      type: object
      properties:
        tradingPairId:
          example: 123e4567-e89b-12d3-a456-426614174000
          type: string
          description: Trading pair UUID
          format: uuid
          nullable: true
        openInterest:
          example: '12345.67'
          type: string
          description: Current open interest in base-asset units
          nullable: true
        updatedAt:
          example: '1736742000000'
          type: string
          description: Timestamp of the latest open interest sample (ms since epoch)
          nullable: true
        openInterestBase:
          example: '12345.67'
          type: string
          description: Current open interest in base-asset units
          nullable: true
        openInterestNotional:
          example: '1172836500.00'
          type: string
          description: Current open interest notional in quote units
          nullable: true
      description: Latest public open interest for a trading pair.

````

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