Profile a CSV before processing it: send the bytes directly or a JSON body with a public {url}. Returns per-column name, inferred type (string/int/float/bool/date/mixed), null and unique counts, min/max and samples, plus row count, detected delimiter and data-quality issues (malformed rows, inconsistent widths, duplicate headers). Query: delimiter (, ; tab |), header=false if row one is data. Max 10 MB.