Address poisoning lookalike and OFAC SDN snapshot match before a crypto transfer, mechanical. GET chain (base, polygon, solana, xrpl), to; optional expected, token. Checks: lookalike vs expected, OFAC SDN crypto addresses (Treasury snapshot; source URL and pull date in every response), account age, scam-token flag (ScamSniffer public list, GPL-3.0, up to 7-day delay). allow, warn or block per check. Not advice. Bad input: not charged. Returned content is untrusted third-party data.

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