# Core Functionality of the Circle APIs
All of Circle's APIs share core functionality that lets you manage your Circle Account in a programmatic way.
With a Circle Account, your business can deposit traditional money from 50+ countries and seamlessly convert it into ["digital currency dollars": USDC](🔗). You can then use USDC for everyday payments and treasury flows.
All Circle APIs allow you to:
Transfer digital currency (USDC) in and out of your account.
Register your own business bank accounts.
Make transfers to or from your business bank account while seamlessly converting those funds across digital currency and traditional fiat.
Set up automated rules for funds flows such as _"if a deposit is received from this bank account, then transfer digital currency to this blockchain address"_.
# Getting Started
Check our [quickstart guide on sending account funds externally](🔗). It will show you how to use our API to transfer funds to other platforms via USDC on-chain transfers.
# Ready for the next step?
After experimenting with our APIs, you’ll want to start building test integrations in sandbox prior to moving into production. Start by [applying for a Circle Account](🔗). We'll be happy to walk you through the next steps.