Kraken Balance-Aware Spot Buy

arazzo: 1.0.1
info:
  title: Kraken Balance-Aware Spot Buy
  summary: Read the account balance and live ticker, then branch on funding before buying.
  description: >-
    A spend-control flow for the Kraken Spot REST API. It reads the account
    balance and the live ticker for the pair, then branches: when the quote-asset
    balance is sufficient it places the buy order, and when it is not it ends the
    workflow without spending. Every step spells out its request inline so the
    flow can be read and executed without opening the underlying OpenAPI
    description.
  version: 1.0.0
sourceDescriptions:
- name: krakenSpotApi
  url: ../openapi/kraken-spot-rest-openapi.yml
  type: openapi
workflows:
- workflowId: balance-aware-buy
  summary: Place a spot buy only when the account holds enough of the quote asset.
  description: >-
    Reads balances and the current ticker, branches on whether the funding asset
    balance is greater than zero, and places a buy order when funded.
  inputs:
    type: object
    required:
    - nonce
    - pair
    - fundingAsset
    - volume
    properties:
      nonce:
        type: string
        description: Ever-increasing nonce for the signed request.
      otp:
        type: string
        description: One-time password if two-factor is enabled on the API key.
      pair:
        type: string
        description: The asset pair to buy (e.g. XBTUSD).
      fundingAsset:
        type: string
        description: The quote/funding asset whose balance must cover the buy (e.g. ZUSD).
      volume:
        type: string
        description: Order volume in base-asset terms.
      price:
        type: string
        description: Limit price for the buy; omit for a market order.
      ordertype:
        type: string
        description: Order type (market or limit). Defaults to market when no price is supplied.
  steps:
  - stepId: readBalance
    description: >-
      Read all asset balances. Private Spot endpoints are signed and accept
      application/x-www-form-urlencoded bodies.
    operationId: getAccountBalance
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        nonce: $inputs.nonce
        otp: $inputs.otp
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      balances: $response.body#/result
    onSuccess:
    - name: funded
      type: goto
      stepId: readTicker
      criteria:
      - context: $response.body
        condition: $.result.length > 0
        type: jsonpath
    - name: unfunded
      type: end
      criteria:
      - context: $response.body
        condition: $.result.length == 0
        type: jsonpath
  - stepId: readTicker
    description: >-
      Read the live ticker for the pair to price the buy against the current ask.
    operationId: getTickerInformation
    parameters:
    - name: pair
      in: query
      value: $inputs.pair
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      ticker: $response.body#/result
  - stepId: placeBuy
    description: >-
      Submit the buy order via AddOrder once funding has been confirmed.
    operationId: addOrder
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        nonce: $inputs.nonce
        otp: $inputs.otp
        pair: $inputs.pair
        type: buy
        ordertype: $inputs.ordertype
        volume: $inputs.volume
        price: $inputs.price
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      txid: $response.body#/result/txid
      descr: $response.body#/result/descr
  outputs:
    balances: $steps.readBalance.outputs.balances
    txid: $steps.placeBuy.outputs.txid