2025 report: crypto phishing losses fall 83% to $84M Read →

Real-time scam intelligence for crypto

Scam Sniffer tracks phishing sites, wallet drainers, and scammer addresses, and publishes them as continuously updated blocklists — a free browser extension for individuals, an API for teams. Queried by wallets and security platforms.

Get API access Get the free extension

blocklist feed

sample

claim-rewards-eigen[.]xyz drainer added · 4m
wallet-rectify-sync[.]com seed phishing added · 11m
app-uniswap-fi[.]net drainer added · 26m
0x9f21…c4ae drainer wallet added · 41m
airdrop-checker-l2[.]io drainer added · 1h
metamask-verify-plus[.]app seed phishing added · 2h

258K+ domains & malicious addresses on the blocklists · updated continuously

Queried by wallets & security teams

How the data is made

One pipeline, from first sighting to your blocklist

Every product runs on the same feed: candidate scam sites and addresses come in around the clock, get verified, and ship to the blocklists.

01 · detect

47M URLs scanned

Candidate sites and addresses are collected around the clock, from multiple independent sources.
02 · verify & attribute

705K scams identified

Every entry is verified before it's added — automated checks first, human review when it's not clear-cut.
03 · deliver

258K domains blocked

Once verified, entries ship to the API, the browser extension, and the open-source database.

For teams

Look up a domain or address, get BLOCKED or PASSED

One edge API, served from Cloudflare's network. Email us for a key, read the docs, integrate.

Domain & URL checks, single or batch
Address checks, single or batch
Blocklist exports for partner integrations

Read the API docs

site check

$ curl "https://lookup-api.scamsniffer.io/site/check?url=https://app-uniswap-fi.net" \
    -H "x-api-key: $SCAMSNIFFER_KEY"

{
  "url":    "https://app-uniswap-fi.net",
  "host":   "app-uniswap-fi.net",
  "status": "BLOCKED"
}

safe browsing

Wallets & extensions

Check links against the domain blocklist before users open them.

monitoring

Security platforms

Merge the blocklists into your own detection, tracing, and alerting.

compliance

Risk & compliance teams

Screen addresses against known scammer addresses during review.

Research

Research, published in the open

We publish drainer-family research, victim statistics, and annual reports — free, from the same pipeline that powers the blocklists. Industry media regularly cite them.

Read our research

As cited by