# 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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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ont.io/developer-tools/api/http-api.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.