x402.blocksec.ai provides on-chain address labeling and risk screening APIs that identify entity types, flags suspicious addresses, and deliver both quick (“light”) and comprehensive (“deep”) screening results across multiple chains (examples show Ethereum, BSC, Tron). Typical endpoints include /label/{chain}/{address} for entity labels and /screen/light or /screen/deep for fast or in-depth risk assessments, making it useful for compliance, investigations, and analytics. Pricing is per-call and ranges from $0.02 to $1.00 depending on the endpoint depth.