Crypto custodian wallet: Free sample app for developers

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.

Try our Android Custodian App
Provide your customers with a secure crypto saving/investing service.

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.

Cryptocurrency wallet app free example

Supported crypto

Bitcoin, Bitcoin Cash, Litecoin, Ethereum, Stellar Lumen, Algorand, Tether, Cardano, Polkadot, Chainlink.


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.


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, 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

Setup your own cryptocurrency back-end and and focus on the development of your business application.

Well documented API, creating a smooth and enjoyable experience integrating our NEXUS infrastructure to your website or app.

    Crypto custodian app example
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