Don't let users be @elonmusk
The complete solution for username validation. Filter brands, profanity, reserved words, and premium names with a single API call.
Status
Latency
~45ms{
"username": "paris",
"isReserved": true,
"isDeleted": false,
"categories": [
{
"category": "city",
"metadata": {
"country": "FR"
}
}
]
}Everything you need to manage identity
Stop building internal blacklists. Use the industry standard for username governance.
15+ Categories
Instantly identify brands, celebrities, cities, offensive terms, and system-reserved keywords.
Global Edge Network
Powered by Cloudflare Workers. 300+ edge locations ensure sub-100ms latency worldwide.
Metadata Enriched
Don't just get a boolean. Get context—Country codes, languages, and category IDs.
High Performance
Built on KV and D1 storage for blazing fast reads. P95 latency is consistently under 300ms.
Smart Normalization
We handle case sensitivity, unicode characters, and whitespace automatically.
Best-in-class Security
Rate limiting, encrypted keys, and strict authentication standards out of the box.
What you can do with username.dev
Protect your namespace, automate moderation, and unlock new revenue — all through a single API.
Block restricted system terms
Stop users from claiming internal paths and sensitive roles like admin, root, support, and sysop.
Auto-moderate offensive usernames
Detect profanity, slurs, sexual content, and other abusive terms before they reach production.
Protect brands & identities
Identify brand names, franchises, celebrities, and city names to prevent impersonation and legal risk.
Monetize premium usernames
Flag short handles, dictionary words, and high-demand identifiers to support auctions or paid changes.
Stop maintaining blacklists.Let the API govern them for you
Built for modern platforms
If usernames matter to your product, this is for you.
Founders & product teams
Launching the next social network, marketplace, or community? Ship username governance on day one without building internal moderation tools.
Trust & Safety teams
Automate takedowns, impersonation defense, and profanity filtering at scale — without manual review.
Growth & revenue teams
Turn usernames into a paid feature: reservations, short-handle auctions, premium change fees, and more.
Drop-in integration for any stack
Stop maintaining massive regex lists and database tables. Integrate username.dev to manage that for you in minutes.
- Universal compatibility (HTTP/JSON)
- Type-safe responses
- Built-in normalization
- Latency < 200ms global average
curl -X GET "https://api.username.dev/check?input=paris" \
-H "Authorization: Bearer un_live_xxx"Prepaid Request Packs
No monthly fees. No subscriptions. Buy credits when you need them. Credits never expire.
Free Trial
Starter Pack
Included in every pack
Regardless of which pack you choose, you get full access to our infrastructure and features.
Burning more than 10M requests per month?Get Enterprise Volume Pricing