> For the complete documentation index, see [llms.txt](https://docs.ont.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ont.io/developer-tools/api/http-api.md).

# HTTP API

The HTTP API serves as the mode of communication between nodes and `dApps`. It can be used to query important information from the blockchain.

HTTP API can be used while testing smart contract logic to find out the blockchain status and other relevant information.

It encapsulates three interfaces that are a part of the HTTP API, and can be regarded as being API in themselves:

1. **Restful** 
2. **RPC**
3. **Websocket**

The ports that the above APIs use are as follows:

|    API    |  Port |
| :-------: | :---: |
|  Restful  | 20334 |
| Websocket | 20335 |
|    RPC    | 20336 |

The following sections describe each of the APIs and the respective methods in detail.


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