Send guard for Arc: call it BEFORE sending USDC or a token. Pass ?from=<sending wallet>&to=<destination> (and &token=0x... for a token send). Returns verdict stop / check / ok with reasons: the destination is a lookalike of an address the sender really used (address poisoning), bait planted in the sender's history by a forged transfer, a token contract or the burn address, on the OFAC SDN list or USDC's own blacklist; the token is a fake USDC / EURC; or a brand-new address (check).
https://apexfaucet.xyz/api/x402/arc-send-guard