Round-robin bet builder API

Enumerates all parlay combinations of a chosen size from N selections, counting tickets (n choose k) and computing per-ticket combined odds, payout, and total stake. Answers 'How many tickets in a round-robin?', 'What does each parlay combo pay in my round-robin?'.

Price$0.06per request

MethodPOST

Route/v1/sports/round-robin

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

sportsbettinground-robinparlaycombinationsticketsaccumulatorstakepermutations

API URLhttps://x402.hexl.dev/v1/sports/round-robin

Integration docs

Example request

{
  "selections": [
    2,
    1.5,
    3
  ],
  "parlaySize": 2,
  "stakePerTicket": 10
}

Example response

{
  "selections": [
    2,
    1.5,
    3
  ],
  "parlaySize": 2,
  "numTickets": 3,
  "stakePerTicket": 10,
  "totalStake": 30,
  "tickets": [
    {
      "legs": [
        2,
        1.5
      ],
      "combinedDecimal": 3,
      "payout": 30
    },
    {
      "legs": [
        2,
        3
      ],
      "combinedDecimal": 6,
      "payout": 60
    },
    {
      "legs": [
        1.5,
        3
      ],
      "combinedDecimal": 4.5,
      "payout": 45
    }
  ],
  "formula": "tickets = C(n, k); each ticket combined = Πdecimal of its legs"
}

Input schema

{
  "type": "object",
  "required": [
    "selections"
  ],
  "properties": {
    "selections": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "Decimal odds per selection (>=2)",
      "examples": [
        [
          2,
          1.5,
          3
        ]
      ]
    },
    "parlaySize": {
      "type": "number",
      "description": "Legs per ticket (>=2)",
      "examples": [
        2
      ]
    },
    "stakePerTicket": {
      "type": "number",
      "examples": [
        10
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}