Count pairwise absent required-column declarations in bounded row-presence metadata. No raw cells, missing-value imputation, population inference or database query. Offline typed nonpersonal metadata only. Result retention: 24 hours; minimal receipt metadata: 90 days.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.02 USDC | 0xec84...de28 |