Backpack Balance-Checked Market Buy

arazzo: 1.0.1
info:
  title: Backpack Balance-Checked Market Buy
  summary: Confirm available balance, read the ticker, then place a market buy and verify the fill.
  description: >-
    A guarded market-entry flow for the Backpack Exchange. It reads account
    balances to confirm funds are available, anchors against the current ticker
    price, submits a market buy that spends a quote-asset amount, and then reads
    the account fills to confirm the order was executed. Every step inlines its
    request — including the ED25519 signing headers required 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: balance-checked-market-buy
  summary: Check balances, quote a market, place a market buy, and confirm the fill.
  description: >-
    Reads account balances and the market ticker, submits a market buy spending
    the supplied quote quantity, and reads recent fills to confirm execution.
  inputs:
    type: object
    required:
    - symbol
    - quoteQuantity
    - apiKey
    - signature
    - timestamp
    properties:
      symbol:
        type: string
        description: The market symbol to buy (e.g. SOL_USDC).
      quoteQuantity:
        type: string
        description: The amount of the quote asset to spend on the market buy, 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: getBalances
    description: >-
      Read account balances so the caller can confirm there is available quote
      asset before placing the buy.
    operationId: get_balances
    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
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      balances: $response.body
  - stepId: getTicker
    description: >-
      Read the ticker to anchor the buy against the current last traded price.
    operationId: get_ticker
    parameters:
    - name: symbol
      in: query
      value: $inputs.symbol
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      lastPrice: $response.body#/lastPrice
  - stepId: placeMarketBuy
    description: >-
      Submit a market buy that spends the supplied quote-asset amount on the
      requested symbol.
    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: Bid
        orderType: Market
        quoteQuantity: $inputs.quoteQuantity
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      orderId: $response.body#/id
      status: $response.body#/status
      executedQuantity: $response.body#/executedQuantity
  - stepId: confirmFill
    description: >-
      Read recent account fills for the symbol to confirm the market buy was
      executed.
    operationId: get_fills
    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: symbol
      in: query
      value: $inputs.symbol
    - name: limit
      in: query
      value: 10
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      mostRecentFillOrderId: $response.body#/0/orderId
      mostRecentFillPrice: $response.body#/0/price
  outputs:
    orderId: $steps.placeMarketBuy.outputs.orderId
    status: $steps.placeMarketBuy.outputs.status
    fillPrice: $steps.confirmFill.outputs.mostRecentFillPrice