Value Validator ($0.002/call)

Validate a value. Body: {type, value, schema?}. type = luhn (credit-card number), iban (bank account), email, or json_schema (validate value against a provided JSON Schema). Returns {valid, ...}.

Paid endpoint: $0.002 per call via the x402 protocol (USDC on Base). An unpaid request returns 402 with payment requirements in the PAYMENT-REQUIRED response header; attach payment and retry.