VariantData_CryptoUpDownVariantData

Variant-specific metadata, discriminated by the type field.

Known variant types are deserialized into typed structs. Unknown variant
types are handled gracefully by the [deserialize_variant_data] helper
on parent structs so that new upstream types don't break deserialization.

{
    "type": "CRYPTO_UP_DOWN",
    "priceFeedProvider": "PYTH",
    "startPrice": 0,
    "endPrice": 0,
    "priceFeedId": "string",
    "priceFeedSymbol": "string"
}