The data behind Knockoff

A background check for any brand.

Millions of marketplace brands aren't companies — they're disposable storefronts, and a few thousand operators run most of them. Send a brand name, product title, or listing URL: one call tells you who's really behind it, with the USPTO record attached to every claim.

Get an API key Check a brand free Read the docs

Built on the full USPTO register: 14,007,055 marks, refreshed every night.

GET /api/v1/brands/tnfeeon

{
  "state": "matched",
  "mark_status": "live",
  "owner_country": "CN",
  "entity_age_months": 72,
  "operator_footprint": {
    "owner_name": "Shenzhen Yibai Network Technology Co., Ltd.",
    "distinct_brands": 87,
    "live_marks": 111,
    "mill_filed": true,
    "cluster": { "known": true, "size": 35 }
  },
  "receipts": [ { "serial_number": "90070690", … } ]
}

mass operator · CNReceipt: USPTO serial 90070690 on TSDR

Not sure the data fits your use case?Text Josh, the founder (279) 240-3865

From the makers of the Knockoff extension — as featured in

14,007,055

USPTO marks in the corpus

43,660

operator clusters published

231,656

marketplace sellers resolved

Nightly

full-register refresh, history since day one

Counts as of July 2026.

Browse the record — no key, no signup.

Everything the API answers is also published as permanent pages: one per brand, one per operator network, free to read, with the receipts inline.

Brand directory

One page per published brand: who owns it, the operator's footprint, every claim linked to the register.

Free to readfull file as a $49 reportBrowse →

Operator directory

One profile per published network: 43,660 clusters — entities, marks, and the evidence connecting them.

Free to readbiggest networks firstBrowse →

Free brand check

Any brand, checked live against the full register in seconds. Published brands land on their dossier page.

Freeno key requiredCheck a brand →

Score a whole search page in one call.

Screen up to 100 brands in one request and catch the mass operators before your users meet them.

curl

curl -X POST https://business.knockoff.co/api/v1/batch \
  -H "Authorization: Bearer kd_your_key" \
  -d '{"brands": ["bombas", "tnfeeon", "jxrev", "zzznotabrand"]}'

Brand	The read	Footprint	state
`bombas`	real company	US company · 10 brands · 2013→2025 · no mill	`matched`
`tnfeeon`	mass operator	CN company · 87 brands · mill · cluster of 35	`matched`
`jxrev`	brand swarm	CN individual · 8 brands · 4-month burst · mill	`matched`
`zzznotabrand`	no trademark	null	`no_record`

Built for the teams who can't afford to guess.

Rank what your agent recommends.

Shopping agents inherit Amazon's pseudo-brand problem with fewer defenses: a bad purchase blames the platform, not the marketplace. One call per candidate product tells you whether there's a real company behind the listing, and you rank or filter on whichever fields matter to you.

owner_countryentity_age_monthsoperator_footprintmill_filedreceipts

Get an API key

The question you're answering

"My agent is about to recommend a brand it has never heard of. Is there a real company behind this listing?"

Resolve accepts raw product URLs and titles, so the call fits where your agent already works. One real listing, one call:

POST /resolve
{"url": "https://www.amazon.com/Churboro/dp/…"}

{ "facts": {
    "state": "matched", "owner_country": "CN",
    "operator_footprint": {
      "distinct_brands": 1,
      "filing_span_years": 0.0,
      "mill_filed": true, … },
    "receipts": [… TSDR links …] },
  "relationship": {
    "relationship": "third_party",
    "seller_entity": {
      "legal_name": "JIAXIN XU", … } } }

A live mark — owned by a one-brand entity that filed once, through a filing mill, sold by someone else entirely. Rank accordingly. See the full recipe.

Screen merchant portfolios overnight.

Document KYB verifies the shell: the registration is real, the TIN matches. It says nothing about whether the brand a merchant sells is a real business or one of 87 disposable storefronts run by a single overseas operator. Batch-screen your book against the register and set your own thresholds.

distinct_brandsownership_transfersowner_typemill_filedoperator_cluster

Run a portfolio screen

The question you're answering

"This merchant passed KYB. Will the business still exist when the chargebacks land?"

Decision-grade lookups with the government record attached — the receipt goes straight into your case file.

Act once against the operator, not a thousand times against listings.

Takedowns treat symptoms. The operator behind them holds dozens of marks across dozens of brands, filed through the same attorneys, from the same addresses. We map the network (entities, aliases, transfer chains, marketplace footprint) with a receipt on every node.

operator_clusteraliasestransfer chainsshared addressesattorney of record

Order an operator report

The question you're answering

"Who is actually behind this network, so we can stop playing whack-a-mole?"

One-off dossiers, counsel-reviewed language, from $2,500. See operator reports.

Know when a banned operator walks back in.

Your INFORM data verifies the documents a seller submits. It doesn't tell you the "new" seller belongs to an operator network you banned last year. Vet incoming sellers and brands against published operator clusters, joined to 231,656 resolved marketplace seller identities.

seller → entity joinoperator_clustercross-marketplace history

Talk to us

The question you're answering

"We banned this operator last year. Are they back on our marketplace right now?"

The longitudinal graph is the point: every month of history makes the migration picture harder to fake.

Answers that survive a dispute.

When a decision gets challenged by an auditor, a lawyer, or an angry merchant, you point at a government record, not a black-box number. That standard shapes everything about how the data is built.

The full register

All 14,007,055 USPTO marks (applications, registrations, assignments), refreshed nightly. Answers come from the whole corpus, not a curated list.

A receipt on every claim

Every answer links serial numbers you can verify on USPTO TSDR in one click. Your users, auditors, and lawyers can check our work.

Ambiguous means silent

When several unrelated owners could match, we say ambiguous and publish no owner claim. You never build a decision on our guess.

Operator networks, evidence-backed

"These brands are one operator" ships only when public records or calibrated matching rules clear the publication bar, with the evidence and basis attached.

Defensible by design

No black-box score. You get the underlying facts and set your own thresholds, so every decision you make traces to a record you can show.

The history clock

Daily deltas archived since day one. Ownership churn, filing bursts, and operator migration are visible because we never stopped watching.

Take it as calls, files, or a finished investigation.

Same graph underneath. Pick the shape that fits how your team works.

Start with a single call.

Keys are self-serve: sign up, name a key, and make your first call in a minute.

curl https://business.knockoff.co/api/v1/brands/tnfeeon \
  -H "Authorization: Bearer kd_your_key"

Get an API key

A background check for any brand.

Browse the record — no key, no signup.

Brand directory

Operator directory

Free brand check

Score a whole search page in one call.

Built for the teams who can't afford to guess.

Rank what your agent recommends.

Screen merchant portfolios overnight.

Act once against the operator, not a thousand times against listings.

Know when a banned operator walks back in.

Answers that survive a dispute.

The full register

A receipt on every claim

Ambiguous means silent

Operator networks, evidence-backed

Defensible by design

The history clock

Take it as calls, files, or a finished investigation.

Lookup API

Data feeds

Reports

Start with a single call.