robruh Roblox name-grade API

One free GET request grades any Roblox username, from S+ (Mythic) down to C (Throwaway). No API key. No sign-up. It is the same quality grade that powers the robruh username generator.

Endpoint

GET https://robruh.com/api/public/name-grade?name=<username>

Parameters

Name	Type	Required	Description
`name`	string	yes	A Roblox username: 3 to 20 characters, letters, numbers, and at most one underscore (not leading or trailing).

Response

A JSON object with exactly three fields:

Field	Type	Description
`name`	string	The validated username.
`grade`	string	The tier letter: `S+`, `S`, `A+`, `A`, `B+`, `B`, `C+`, `C`, or `D`.
`tier_label`	string	The human word for the tier: `Mythic`, `Legendary`, `Epic`, `Rare`, `Uncommon`, `Common`, `Filler`, `Throwaway`, or `Reject`.

{
  "name": "Vexinor",
  "grade": "A+",
  "tier_label": "Epic"
}

Errors return a JSON object with an error field. An invalid name returns 400 and never echoes your input back. The grade is deterministic: the same exact string always returns the same grade. Case matters — letter case is part of the grade (Frostix and FROSTIX can score differently), so send the name exactly as you want it graded.

What it does NOT return

By design, the response carries only the grade. It does not tell you whether a name is available on Roblox, a numeric score, or any internal scoring factors. Availability is intentionally not exposed.

Limits

30 requests per minute, per IP.
2,000 requests per day, per IP.

Responses are cacheable: Cache-Control: public, max-age=3600. Please cache on your end and you will rarely hit the limits.

CORS & how to call it

The endpoint sends Access-Control-Allow-Origin: *, so you can call it with fetch() from a browser on any site. This is intentional and stable — the browser example below is the primary supported path.

Server-to-server callers (a backend, a bot, a plain curl) may be asked to complete a browser check by our edge provider. If you need reliable server-side access, send a real browser User-Agent, or reach out and we will allowlist your integration.

Attribution

This API is free to use. If it helps your project, please link back to robruh.com. A credit is all we ask.

Examples

From JavaScript in the browser (the primary supported path):

fetch("https://robruh.com/api/public/name-grade?name=Vexinor")
  .then(r => r.json())
  .then(data => console.log(data.grade, data.tier_label));
// { name: "Vexinor", grade: "A+", tier_label: "Epic" }

From a server, send a browser User-Agent:

curl -A "Mozilla/5.0" "https://robruh.com/api/public/name-grade?name=Vexinor"

More Roblox name tools

Want names, not just grades? Try the free Roblox username generator or the account & username value checker.