Run a single prediction using a trained model.

Pass a JSON object of input values matching your model's feature columns. With the default
channel="direct", returns the predicted value, confidence probability (classification only),
a plain-English AI explanation, and the top factors that influenced the result inline. With
channel="webhook", the prediction is queued instead and the result is POSTed to your
configured webhook when ready — the API returns a job_id immediately (202).

Uses your latest model by default; pass model_id to target a specific version.