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There is no restricted list of leagues or market types. Every market listed on the exchange — mainlines, player props, and futures, across every league, pregame or live — is combo-eligible. A parlay generates an RFQ unless it breaks one of these rules:
  • 2–10 legs. Single legs route to the order book, never to RFQ.
  • Every leg’s event must be open (pregame or in-game).
  • No special/custom promo markets, and no NO side of yes/no futures.
  • Same game is allowed, except pairs that collapse into one position (e.g. spread + moneyline, total + total).
  • Same player: blocked when one stat contains the other (e.g. PRA + Points) or the market type is identical.
  • Different games can’t share a team.
  • Futures combine with anything outside their own league only.
The blocked-pair lists are tuned over time — the examples are illustrative, not exhaustive. Your pricer sees the resolved legs on /quote and can decline any request with a 204.