{
  "operationId": "check-domain-availability",
  "method": "GET",
  "path": "/v2/studio/vercel/domain/check",
  "summary": "Check if a custom subdomain is available",
  "description": "Checks whether a custom *.neynar.app subdomain is available for assignment. Validates format, checks reserved names, and verifies no other active deployment is using it. Note: Studio CU is tracked based on LLM token usage, not per API call.",
  "tags": [
    "studio"
  ],
  "parameters": [
    {
      "name": "fid",
      "in": "query",
      "required": true,
      "description": "Farcaster ID of the requesting user",
      "schema": {
        "example": 3,
        "format": "int32",
        "minimum": 0,
        "type": "integer"
      }
    },
    {
      "name": "subdomain",
      "in": "query",
      "required": true,
      "description": "The desired subdomain (without .neynar.app suffix). Must be 3-63 characters, lowercase alphanumeric and hyphens only.",
      "schema": {
        "maxLength": 63,
        "minLength": 3,
        "pattern": "^[a-z0-9]([a-z0-9-]*[a-z0-9])?$",
        "type": "string"
      }
    }
  ],
  "requestBody": null,
  "responses": {
    "200": {
      "description": "Success",
      "schema": {
        "properties": {
          "available": {
            "description": "Whether the subdomain is available",
            "type": "boolean"
          },
          "domain": {
            "description": "The full domain (e.g., myapp.neynar.app)",
            "type": "string"
          },
          "reason": {
            "description": "Reason why the subdomain is unavailable (e.g., \"reserved\", \"taken\")",
            "type": "string"
          }
        },
        "required": [
          "available",
          "domain"
        ],
        "type": "object"
      },
      "example": null
    },
    "400": {
      "description": "Bad Request",
      "schema": {
        "properties": {
          "error": {
            "type": "string"
          },
          "success": {
            "enum": [
              false
            ],
            "type": "boolean"
          }
        },
        "required": [
          "success",
          "error"
        ],
        "type": "object"
      },
      "example": null
    },
    "500": {
      "description": "Server Error",
      "schema": {
        "properties": {
          "error": {
            "type": "string"
          },
          "success": {
            "enum": [
              false
            ],
            "type": "boolean"
          }
        },
        "required": [
          "success",
          "error"
        ],
        "type": "object"
      },
      "example": null
    }
  }
}