Integrate with a bank account verification provider (such as GIACT's account validation product or an equivalent service offered by your payment processor or data aggregator) by obtaining API credentials through your contract.
Submit the account holder's name, routing number, and account number to the verification endpoint; the service checks the account against bank data and negative databases.
Parse the response for a verification decision code indicating whether the account is valid and open, the owner name matches, and whether negative history (chargebacks, closures) exists.
Map decision codes to your onboarding policy: typically 'verified' proceeds, 'not found' or 'closed' rejects, and 'negative history' routes to manual review.
Log all verification request IDs and decision codes for compliance and dispute resolution.
Ensure your data processing agreement with the vendor covers your use case and that you have the account holder's authorization to verify their account details.
Known gotchas
GIACT and similar bank account validation providers have been acquired or rebranded over time; confirm current product names and API endpoints directly with your vendor or their current parent company.
Name matching is typically fuzzy; minor name discrepancies (nicknames, middle names) may return a non-match even for legitimate accounts—tune your matching threshold accordingly.
Regulatory permissible use requirements vary; verify that your use of the negative database data is compliant with applicable law (FCRA or otherwise).
Give your agent this knowledge — and 200+ more routes
One MCP install gives any agent live access to the full route map, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp