Card issuing
Issue virtual cards for your users, fund them from your USDT wallet, freeze, unload and close them — all through one API.
Base URL: https://api.2328.io/caas/v1. JSON only, all fields are camelCase, every request is authorised with Authorization: Bearer ck_{keyId}_{secret}. There is a single live environment — no sandbox keys.
1.General
Envelope, money format, idempotency, rate limits and pagination rules.
2.Account
Account capabilities, wallet balance and history, funding and the default pricing schedule.
3.Tariffs
Tariff plans catalogue, per-card schedules and exact fee quotes before an operation.
4.Cardholders
Register and manage the people you issue cards for.
5.Cards
Products, issuing, funding, lifecycle, balances and transactions of virtual cards.
6.Orders
Track asynchronous money operations to their terminal state.
7.Webhooks
Configure your endpoint, verify signatures and handle delivery.
8.Errors
Error envelope, stable codes, decline codes and retry policy.