curl --request POST \
  --url https://api.example.com/v2/{entity}/{project}/predictions \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputs": {},
  "model": "<string>",
  "output": "<unknown>",
  "evaluation_run_id": "<string>",
  "genai_span_ref": [
    {
      "span_id": "<string>",
      "trace_id": "<string>"
    }
  ]
}
'

{
  "prediction_id": "<string>"
}