Stablecoin Settlement & Save

TBook Settlement & Save lets payment companies, fintechs and digital banks move and hold stablecoin value (USDC, USDT) for their users — deposits, transfers, withdrawals, point-of-sale spending, and an optional yield product — through one REST API plus signed webhooks, without touching a blockchain node, a private key, or a chain concept anywhere in the integration.

It is a standalone service with its own developer documentation: