3 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
FDIC bank-health check, deterministic. Answers "is my bank safe", "is this bank well capitalized", "did this bank fail". Resolves a US bank by name or FDIC cert, then computes from quarterly Call Reports: PCA capital cat...
Validate a Spanish Social Security affiliation number (12 digits: province, number, control) and return the province of registration. Computed locally; nothing stored.
US payroll tax estimate: Social Security and Medicare on wages, or self-employment tax, including the additional Medicare surtax. Pure computation over your inputs, not tax advice.