Circle APIs Documentation

Learn how to integrate with Circle APIs to accept traditional and stablecoin payments, embed digital wallets into your product or service, or power your internet marketplace.


What is Ropsten?

As you know, Circle APIs represent value in the form of USDC which is a token running on the Ethereum blockchain.

The Ethereum protocol runs on various testing networks ("testnet"), allowing developers to test their applications before deploying code on the main network ("mainnet"). Ropsten is one of those testing networks.

USDC on Ropsten


The USDC smart contract has been deployed to the Ropsten testnet and is available on address 0x07865c6e87b9f70255377e024ace6630c1eaa37f.


As Ropsten is a testing network, the USDC tokens in circulation there are minted in a completely arbitrary way, and are in no way backed by real US dollars.

Ropsten and Circle APIs on Sandbox

Circle's sandbox environment is connected to USDC on the Ropsten testnet.

In other words, when you send funds from a Circle hosted wallet to an external blockchain address, it will be send as USDC on Ropsten. Similarly, if you want to receive funds from an external blockchain address, you can use USDC on Ropsten to achieve that.

Updated 3 months ago


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