Generated a name with AI? Check it before you fall in love. Pentonym runs a full trademark clearance across US & EU marks — plus domains, handles, web use and cultural flags — and returns a signed verdict you can verify yourself.
3 free checks · no signup · US & EU · domains · handles · web · cultural
Building something? API & MCP for developers →Language models suggest names that sound available — and almost never are. That’s why you’ll check a lot before one clears, and why the check has to be real: a signed US & EU trademark verdict, not a guess. Pentonym is the check your AI can’t do on its own.
▸ measured live from Pentonym checks
Most tools blur “available” and “safe.” Pentonym keeps them apart: one axis can bar a name, four are material — they tell you what to handle, never whether you can proceed. Here’s each one, with the evidence it returns.
Pentonym screens the US register (14.1M marks) and the EU register (EUIPO, live), surfaces the marks nearest yours in sight and sound, and weighs each against your class. A confusingly similar senior mark is the one thing that bars a name.
How likelihood of confusion works →| PENTON | Penton Communications Inc. | cl 9 |
| PANTONIUM | Pantonium Inc. | cl 42 |
| PENTENAMIO | Penten Pty Ltd | cl 9, 45 |
We check the TLDs founders actually weigh, via RDAP and WHOIS. A taken .com is never a reason to drop a name — plenty of strong brands launch on a .co or .io.
Check a name across all five →GitHub, X, npm, PyPI and YouTube, checked in a single pass — with deep checks for Instagram and TikTok on demand. An open handle everywhere is nice; it’s never what makes a name safe.
Try the handle checker →In the US, rights come from use, not registration — so an unregistered business can hold rights a register never shows. Pentonym searches the open web for real commercial use, surfaced with high salience and never a silent bar.
Common-law search, explained →Exact-match screening against offensive-term lexicons across a 20-market panel. It catches known terms, not connotation — so it’s honest about its ceiling, and native review still matters for a market you commit to.
Pentonym returns one of three verdicts — never a number, never a false green. The rare states are designed as proudly as the common one.
No barring US trademark conflict. You get the green light — plus every material signal to handle before you commit.
A live US mark would likely block the name in your class. We name which one, and why — so the “no” is evidence, not a shrug.
When the evidence isn’t conclusive, we say so — instead of guessing. Uncertainty is a first-class answer, never a fake verdict.
The receipt you just saw is an API response. Wire Pentonym into your assistant, agent or app in about thirty seconds — 3 checks free, no signup. The same signed US & EU verdict, three ways in.
A hosted MCP server for Claude, Cursor and ChatGPT connectors. Works anonymously for the first checks; connect for more.
One POST returns the signed verdict. The same key drives MCP. A batch endpoint runs mass search over every name your LLM makes.
OAuth 2.1 for connectors and platforms. Your users connect Pentonym once — then their assistant checks on their credits, forever.
One flat plan checks unlimited names — so you can run through every candidate your LLM generates until one actually clears. Or usage-based access for apps and agents.
See plans →Out of backups? Pentonym generates and clears names for you, and hands back a shortlist that’s verified claimable — US & EU trademark-clear, domain and handles open.
Get a clear name →Thirty seconds · one signed verdict · nothing to sign up for.
3 free checks · no signup · US & EU · not legal advice