curl --request POST \
  --url https://api.globalwebindex.com/v1/spark-api/mcp \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "id": "req-123",
  "method": "tools/call",
  "params": {
    "name": "chat_gwi",
    "arguments": {
      "prompt": "What marketing channels work best for Audi drivers in the US?"
    }
  }
}'

{
  "jsonrpc": "2.0",
  "id": "<string>",
  "result": {
    "content": [
      {
        "type": "text",
        "text": "<string>"
      }
    ],
    "isError": true
  }
}