Its a simple query of 2 values, current EBT Food Benefit and current EBT Cash balance. There isn't terribly much to support, and the "service" itself is a simple database lookup that is near zero cost to perform. API access for this should be free, its a public good.
In the EU, all banks are required to provide basic banking services, including a debit card, to anybody who does not currently have a bank account. This practically killed cheque-cashing shops in the UK, and provided a significantly higher quality of life for workers, as well as simplifying payroll - direct debit can now be provided to all workers, there's no need to provide a cheque option.
The issue, of course, is that the US Visa/Mastercard system is an often-offline, pull-based system - meaning that a card set up to always require online transactions may be unusable, preventing banks from providing accounts with a debit card without the potential for an overdraft.
More recently I've thought considering that we now only have 4-5 large banks it makes more sense than ever since after 40 years of mergers that are 4-5 banks left and they are abusing their monopoly power.
If that were the case, I'm not sure how helpful it would be. Have you tried to get into a post office lately? Frigging places are never open during hours that people who work could get in. But I suppose that wouldn't be as much of a problem for social security and unemployment...
