By default, [Barge](https://github.com/oceanprotocol/barge) will deploy a local _Spree Testnet_[^1] on your machine: a local testnet not connected to any external public testnet.
When running a Spree Testnet, you can connect to a node at RPC URL [http://localhost:8545](http://localhost:8545) (called "Localhost 8545" in MetaMask).
Spree Testnet details can be found in the [Barge README.md file](https://github.com/oceanprotocol/barge#spree-network). You can configure the Spree nodes by editing the files in the `barge/networks/spree/` directory.
There is a Nile blockchain explorer at [https://submarine.nile.dev-ocean.com/](https://submarine.nile.dev-ocean.com/). You can use it to check the status of a transaction, the balance of an account, and more. It uses the following symbols for Nile Ether and Nile Ocean Tokens:
If you run [Barge](https://github.com/oceanprotocol/barge) with the `--local-nile-node` option, then Barge will run a Nile node on your local machine (along with everything else Barge runs).
There might be many blocks in the Nile Testnet's blockchain, so it might take a long time for your local Nile node to sync, i.e. to download a local copy of all the blocks. **In the meantime, the local Nile node won't be able to do certain things.**
> You shouldn't use a Ganache-Based Testnet unless you know why you're doing so. For example, a Ganache-based testnet can be used to test some smart contracts, but it can't be used with a Secret Store.
The Duero Testnet is similar to the Nile Testnet, but it's only for internal use by the Ocean Protocol dev team. They test new things in the Duero Testnet before deploying them in the Nile Testnet (which is for use by anyone). That is, the testing order is Spree (local), Duero (private), Nile (public).
If you need to know something technical about the Duero Testnet, such as the RPC URL, please contact the Ocean Protocol dev team.
