curl --request POST \
  --url https://api.cala.ai/v1/knowledge/search \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "input": "What are the most promising climate tech startups in Southern Europe?"
}
'

{
  "content": "**Altano Energy (Spain)** — Madrid-based, developing renewable energy projects across Spain. Secured €60M Series C in 2025 from M&G Investments and Pioneer Point Partners.",
  "context": [
    {
      "content": "Altano Energy - €60m (Series C, Jul 2025). Develops and operates renewable energy projects across Spain...",
      "id": "732e1954-9538-4fbc-a565-db2f8c07ad4e"
    }
  ],
  "entities": [
    {
      "entity_type": "ORG",
      "id": 1160,
      "name": "OpenAI"
    }
  ],
  "explainability": [
    {
      "content": "Altano Energy secured a €60 million Series C round in July 2025 from Pioneer Point Partners and M&G Investments.",
      "references": [
        "f22a1a96-6234-48d7-95c2-8b049f00fdab"
      ]
    }
  ]
}