NBXplorer

Indexes only tracked wallets, minimizing storage and sync time compared to full-node solutions like Electrum, as highlighted in the README's focus on pruned node compatibility.

Operates without a fully indexed blockchain, saving disk space, which is emphasized as a key feature for lightweight infrastructure.

Supports Bitcoin and over 20 altcoins such as Litecoin and Dash, enabling services to track multiple UTXO-based cryptocurrencies from a single instance.

Uses PostgreSQL for persistence, allowing developers to run complex queries on wallet data beyond the REST API, as documented in the schema docs.

Integrates with Azure Service Bus and RabbitMQ for message brokering, providing scalable event listening for transactions and blocks.