curl -X POST "https://api.agenticpencil.com/v1/keywords/gaps" \
  -H "Authorization: Bearer ap_your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
    "domain": "sonant.ai",
    "competitors": ["smith.ai", "ruby.com"],
    "country": "us",
    "limit": 20
  }'

{
  "success": true,
  "data": {
    "domain": "sonant.ai",
    "competitors": ["smith.ai"],
    "gaps": [
      {
        "keyword": "virtual receptionist service",
        "search_volume": 3600,
        "keyword_difficulty": 45,
        "competitor_positions": { "smith.ai": 5 }
      }
    ],
    "total_gaps": 1
  },
  "meta": {
    "credits_used": 10,
    "credits_remaining": 990,
    "request_id": "abc-123"
  }
}