{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/snapapi/main/json-schema/snapapi-usage-schema.json",
  "title": "SnapAPI Usage",
  "description": "Per-API-key monthly usage report returned by GET /api/usage.",
  "type": "object",
  "required": ["tier", "used", "limit", "remaining"],
  "properties": {
    "tier": {
      "type": "string",
      "enum": ["free", "starter", "basic", "pro"],
      "description": "Billing tier of the API key."
    },
    "used": { "type": "integer", "minimum": 0 },
    "limit": { "type": "integer", "minimum": 0 },
    "remaining": { "type": "integer" }
  }
}