Deterministic UUIDv5 API

Returns the RFC-4122 SHA-1 name-based UUIDv5 for a namespace + name, with version/variant metadata. The value-add: same namespace+name always yields the exact same UUID anywhere, getting the SHA-1 hashing, byte order, and version/variant bit-twiddling exactly right. Answers 'What is the UUIDv5 for this name?', 'How do I make a stable deterministic ID from a string?'.

Price$0.01per request

MethodPOST

Route/v1/generate/uuid-v5

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

uuiduuidv5rfc-4122deterministicnamespacesha1idgenerate

API URLhttps://x402.hexl.dev/v1/generate/uuid-v5

Integration docs

Example request

{
  "namespace": "dns",
  "name": "example.com"
}

Example response

{
  "uuid": "cfbff0d1-9375-5685-968c-48ce8b15ae17",
  "version": 5,
  "variant": "RFC-4122",
  "namespace": "6ba7b810-9dad-11d1-80b4-00c04fd430c8",
  "namespaceLabel": "dns",
  "name": "example.com",
  "algorithm": "SHA-1",
  "deterministic": true,
  "interpretation": "UUIDv5 of name \"example.com\" in namespace — regenerates identically anywhere."
}

Input schema

{
  "type": "object",
  "required": [
    "namespace",
    "name"
  ],
  "properties": {
    "namespace": {
      "type": "string",
      "description": "dns, url, oid, x500, or a UUID string",
      "examples": [
        "dns",
        "url"
      ]
    },
    "name": {
      "type": "string",
      "examples": [
        "example.com"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}