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I’ve seen some references to services, though none seem to be free (or are limited to a couple of addresses at best, such as one site
mentioned here), though I’ve no notion as to how professional or significant they are, and one should probably think it through before providing their IP/addresses to check to any (random) site to begin with. One consideration is that there is probably no industry standard, which could lead to a given address being flagged by one service provider and not by another.
A year ago or so, I
took at look at what General Bytes (bitcoin ATMs) does in this sense, when talking over something or other on our local forum. According to their documentation (see
here and
here), their scoring comes from APIs provided by CipherTrace and/or Chainanalysis. These may therefore be good underlying service providers to search for, besides there being no seemingly standard.
To this effect, at least Chainanalysis seems to have a free API that you may manage to wiggle into them providing you a key to (I think it’s meant for professionals, but I’m not sure how much they’ll dig into that). Could be worth a try:
https://www.chainalysis.com/free-cryptocurrency-sanctions-screening-tools/The said API does seem to be based on sanction lists, but I haven’t seen how it deals with addresses that are N-steps away from one of such addresses.