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Filtering venue plus externalIdentifier returns that member, not the anchor. List responses return one row per matched cluster, and for a matched event id is the anchor. Re-resolve it. Do not store it as a permanent key. Hyperliquid HIP-4 books are also split by deployerVenue. See Hyperliquid deployers.
Full shape on List venue events. Markets for an event are List venue markets. One contract is Look up venue market outcomes by external identifier. aggKey as a filter is aggKey.