# Validation Services common content 1
source: https://developer.mastercard.com/cross-border-services/documentation/api-ref/common1-bank-account-validation-api/index.md

Validation Services is a Value-Added Service provided by Mastercard Cross-Border Services. This is an opt-in service that will allow customers to generate, validate and look up both account and bank related information.

These APIs will assist customers to process transactions with valid data for specific countries.

For complete list of countries supported for validation services, refer
[CountriesSupported.xlsx](https://static.developer.mastercard.com/content/cross-border-services/uploads/CountriesSupported.xlsx) (29KB). This list will be maintained by Cross-Border services.