get https://{environment}.rarible.org/v0.1/items/traits/search
Returns aggregation of existing traits for specified collections with counter for each trait type/value. This is full-text-search, where you can specify filter for trait keys not precisely (for example, results back filter include Background trait)
Note
Addresses in EVM-compatible blockchain networks are the same, so to correctly filter by owner or creator, you must use the prefixes appropriate for each specific network. "ETHEREUM:0x..." - for EVM networks, for non-EVM networks the name of the blockchain, for example - "FLOW:0x..."