# Index

Expansion is an API for interacting with the Bantu network.

This API serves as the bridge between apps and [Bantu Core](/run-core-node/index.md). Projects like wallets, decentralized exchanges, and asset issuers use Expansion to submit transactions, query an account balance, or stream events like transactions to an account.

Expansion is a [RESTful API](https://en.wikipedia.org/wiki/Representational_state_transfer) and can be accessed via cURL, a browser, or one of the [Bantu SDKs](/software-and-sdks/index.md). To reduce the complexity of your project, we recommend you use an SDK instead of making direct API calls.

The Bantu Blockchain Foundation (BBF) runs two instances of Expansion:

* [https://Expansion.Bantu.org/](https://Expansion.Bantu.network/) for interacting with the public network
* [https://Expansion-testnet.Bantu.org/](https://Expansion-testnet.Bantu.network/) for interacting with the [testnet](/glossary/testnet.md)

API Reference Sections

| [Introduction](/api/introduction.md) | How Expansion is structured.                   |
| ------------------------------------ | ---------------------------------------------- |
| [Resources](/api/resources.md)       | Descriptions of resources and their endpoints. |
| [Aggregations](/api/aggregations.md) | Descriptions of specialized endpoints.         |
| [Errors](/api/errors.md)             | Potential errors and what they mean.           |


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