Developing your own cryptocurrency custodial wallet solution can be daunting and time-consuming. Not only do you have to build all the basic functionality such as creating an account, user management, and transactions like buying, selling, and swapping. You also need to connect your custodian wallet to a reliable and secure cryptocurrency infrastructure.
To get to production quickly and efficiently, we have released a complete crypto custodian infrastructure solution consisting of a backend API for managing customers, transactions, and crypto balances and a mobile sample application.
The API backend handles the mobile app OAUTH authorization and stores the sensitive customer data at an in-house location. Moreover, it creates a secure connection with the NEXUS backend API, which supports different cryptocurrency operations and allows customer data handling. You can use this API and integrate it into your backend system.
The cryptocurrency custodial wallet sample application is developed in React Native. The sample application can be used as a basis for your wallet application and can carry out all the operations discussed above. You can customize the application to your needs by cloning the repository on Gitlab.
NEXUS Crypto Custodian Infrastructure
The general architecture explaining how this sample application has been developed is shown below. It also offers an API backend to manage the customers, which can be a starting point for your system. You can easily connect to your front and back end, creating a unique white label solution customized to your business needs—more information on crypto infrastructure solutions.

Supported crypto
Bitcoin, Bitcoin Cash, Litecoin, Ethereum, Stellar Lumen, Algorand, Tether, Cardano, Polkadot, Chainlink.
SECURE
NEXUS leverages proven, reliable, and scalable crypto infrastructure technology as a service, deployed in the cloud with enterprise-grade providers Microsoft Azure and Amazon Web Services. The NEXUS Platform has been in production since 2015. More about security.
ISO 27001 & ISAE 3402 TYPE 1 CERTIFIED
One of our core value propositions ensures that our infrastructure responds to the highest levels of security, confidentiality, and availability. With this goal in mind, we passed our first ISO 27001 certification in December 2020. We are delighted to announce that we have now added an ISAE 3402 Type 1 certification to this.
NEXUS
NEXUS, our infrastructure platform for an automated token, crypto, and fiat transaction processing, enables you to start offering various cryptocurrency services, such as brokerage, merchant, or custodian services developed by Quantoz blockchain technology.
Sample App and website
In order to help you get started efficiently, we have prepared a sample application that you can use to speed up your development. The sample app includes a simplified model of the features that are usually offered by a broker platform, such as the creation of customers, account and buy/sell operations.
Easy integration via API
Well documented API, creating a smooth and enjoyable experience integrating our NEXUS infrastructure to your website or app.
