Backpack Place a Limit Order

arazzo: 1.0.1
info:
  title: Backpack Place a Limit Order
  summary: Price a market from the ticker and order book, then place and confirm a limit order.
  description: >-
    A grounded order-entry flow for the Backpack Exchange. It reads the 24h
    ticker and the live order book depth for a market so the caller can anchor a
    limit price, submits a limit order to the matching engine, and then queries
    the resting order to confirm it landed on the book. Every step spells out its
    request inline — including the ED25519 signing headers the exchange requires
    on authenticated calls — so the flow can be read and executed without opening
    the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: backpackApi
  url: ../openapi/backpack-exchange-openapi.yml
  type: openapi
workflows:
- workflowId: place-limit-order
  summary: Quote a market, place a limit order, and confirm it is resting on the book.
  description: >-
    Reads the ticker and order book depth for the target symbol, submits a limit
    order on the requested side at the supplied price and quantity, then reads
    the order back to confirm its status.
  inputs:
    type: object
    required:
    - symbol
    - side
    - price
    - quantity
    - apiKey
    - signature
    - timestamp
    properties:
      symbol:
        type: string
        description: The market symbol to trade (e.g. SOL_USDC).
      side:
        type: string
        enum:
        - Bid
        - Ask
        description: Order side; Bid to buy, Ask to sell.
      price:
        type: string
        description: The limit price as a decimal string.
      quantity:
        type: string
        description: The order quantity in the base asset as a decimal string.
      apiKey:
        type: string
        description: Base64 encoded ED25519 verifying key for the X-API-KEY header.
      signature:
        type: string
        description: Base64 encoded ED25519 signature for the X-SIGNATURE header.
      timestamp:
        type: integer
        description: Unix time in milliseconds for the X-TIMESTAMP header.
      window:
        type: integer
        description: Request validity window in milliseconds for the X-WINDOW header (default 5000).
  steps:
  - stepId: getTicker
    description: >-
      Read the 24h ticker for the market to anchor the order price against the
      last traded price.
    operationId: get_ticker
    parameters:
    - name: symbol
      in: query
      value: $inputs.symbol
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      lastPrice: $response.body#/lastPrice
      high: $response.body#/high
      low: $response.body#/low
  - stepId: getDepth
    description: >-
      Read the order book depth so the caller can see the best bid/ask before
      committing the order.
    operationId: get_depth
    parameters:
    - name: symbol
      in: query
      value: $inputs.symbol
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      bids: $response.body#/bids
      asks: $response.body#/asks
  - stepId: placeOrder
    description: >-
      Submit a limit order to the matching engine on the requested side at the
      supplied price and quantity.
    operationId: execute_order
    parameters:
    - name: X-API-KEY
      in: header
      value: $inputs.apiKey
    - name: X-SIGNATURE
      in: header
      value: $inputs.signature
    - name: X-TIMESTAMP
      in: header
      value: $inputs.timestamp
    - name: X-WINDOW
      in: header
      value: $inputs.window
    requestBody:
      contentType: application/json; charset=utf-8
      payload:
        symbol: $inputs.symbol
        side: $inputs.side
        orderType: Limit
        price: $inputs.price
        quantity: $inputs.quantity
        timeInForce: GTC
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      orderId: $response.body#/id
      status: $response.body#/status
      executedQuantity: $response.body#/executedQuantity
  - stepId: confirmOrder
    description: >-
      Read the order back from the book to confirm it is resting and report its
      current status.
    operationId: get_order
    parameters:
    - name: X-API-KEY
      in: header
      value: $inputs.apiKey
    - name: X-SIGNATURE
      in: header
      value: $inputs.signature
    - name: X-TIMESTAMP
      in: header
      value: $inputs.timestamp
    - name: X-WINDOW
      in: header
      value: $inputs.window
    - name: orderId
      in: query
      value: $steps.placeOrder.outputs.orderId
    - name: symbol
      in: query
      value: $inputs.symbol
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      confirmedStatus: $response.body#/status
      confirmedId: $response.body#/id
  outputs:
    orderId: $steps.placeOrder.outputs.orderId
    status: $steps.confirmOrder.outputs.confirmedStatus
    lastPrice: $steps.getTicker.outputs.lastPrice