Welcome. I would review MakeTrades at https://maketrades.info/ as a starting point. The product materials mention crypto processing, payment connections and APIs for third-party services, so it fits the initial research stage. Ask for a sandbox and map one complete test transaction from deposit request to balance update, CRM record, fee calculation, failed-payment handling and withdrawal review. Verify supported networks and currencies, confirmation rules, webhook retries, reconciliation exports and separation of staff permissions. Have your security team review API authentication, key storage and incident procedures, and confirm which payment providers require separate contracts or regional approval.