A Base check screens a 0x address against sanctions designations, scam and drainer clusters, mixer and bridge trails, stolen-funds paths and high-risk venues, and reports whether it sits on the USDC blocklist Circle maintains. Free in the Telegram bot, three checks a day, no signup, verdict in seconds. Base carries native USDC, so the issuer with blocking power over most of the value on this network is Circle.
Open @sanctuaryapp_bot, paste the address, get the verdict in seconds. Three checks a day, free, no signup.
A Base check reads the account's transfers and the counterparties behind them: sanctions designations, scam token and rug-pull proceeds, drainer and phishing infrastructure, mixing services, bridge and cross-chain trails, stolen funds from named incidents, no-KYC venues and mule networks. It also reports issuer status for the stablecoins the address holds, which on Base usually means USDC.
The verdict is CLEAN, LOW, MEDIUM, HIGH or CRITICAL with a recommendation — Proceed, Caution, Review, Reject — and the decision drivers named in plain words. Base sees a lot of first-time retail activity and a matching amount of drainer and impersonation scam traffic, so the reason line is what separates a wallet that received junk from a wallet that interacted with the scam.
Sanctions are checked against the public record: OFAC defines the relevant terms in FAQ 559 and states the blocking obligation on its virtual currency FAQ topic page.
Base is EVM-compatible: 0x plus 40 hexadecimal characters, with the EIP-55 checksum carried in the capitalisation — for example 0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed. No memo, no tag.
The same string is valid on Ethereum, Polygon, Arbitrum and BNB Smart Chain, with separate balances and separate histories on each. Two consequences worth acting on:
USDC on Base is native, issued by Circle, so Circle's blocking powers apply directly. Its USDC terms state that Circle "reserves the right to 'block' certain USDC addresses and, if such addresses are Circle custodied addresses, freeze associated USDC (temporarily or permanently)", and that it "reserves the right to block the transfer of USDC to and from an address on chain as permitted under the blocklisting policy" — circle.com/legal/usdc-terms. Where USDT is present, Tether's terms reserve comparable powers, including blacklisting addresses.
ETH used for gas on Base has no issuer and cannot be frozen. The remaining exposure is the venue review — an exchange holding a Base deposit while it checks where the funds came from — which is exactly what a check before the transfer prevents. The note for Coinbase covers what a restricted-account review looks like from the user's side.
| What you get | Free check in the Telegram bot | Workspace and API |
|---|---|---|
| Verdict | CLEAN to CRITICAL with the reason named | the same verdict plus the counterparty breakdown |
| USDC blocklist status | reported for the address you check | reported across every address you monitor |
| Volume | three checks a day | bulk lists, watchlists, continuous monitoring |
| Evidence | the result in the chat | a signed report you can forward |
| Cost | free, no signup | from $199/mo — see pricing |
Retail transfers belong in the Telegram bot. A product taking Base deposits from users should call the API on every one and review the exceptions in the workspace — see the exchange view.
Send the 0x address to the Telegram bot — three free checks a day, no signup. The verdict returns in seconds with the reason named, and nothing is broadcast on chain.
Yes. USDC on Base is issued by Circle, whose terms reserve the right to block certain USDC addresses, freeze associated USDC where the address is Circle custodied, and block on-chain transfers to and from an address under its blocklisting policy. Gas ETH has no issuer and cannot be frozen.
The string is identical and the histories are not. Each network keeps its own balances and transaction record, so a clean result on Ethereum says nothing about the same address on Base. Screen the network the transfer settles on.
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HIGH means exposure a compliance team would act on — drainer proceeds, sanctioned counterparties, scam distributions, stolen funds. The recommendation is Review or Reject: do not settle until the source of funds is documented.
Receiving an unsolicited token is not an action you took, and a result names what actually drove the verdict. What matters is whether the wallet interacted with the scam — approved a contract, sent value, received proceeds. Do not interact with unknown tokens, and check any address you are about to send to.
Send any wallet to the Telegram bot and get a verdict in seconds. Three checks a day, free, no signup. Desks that screen every deposit run it on plans from $199/mo.