> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uniblock.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Optimism Binance Smart Chain Testnet (OPBNB) (BNB) Overview

Optimism Binance Smart Chain Testnet (OPBNB) (BNB) RPC

Use Uniblock's JSON-RPC endpoint to access Optimism Binance Smart Chain Testnet (OPBNB) (BNB) with low-latency routing and a single API surface across providers.

## What is Optimism Binance Smart Chain Testnet (OPBNB)?

Optimism Binance Smart Chain Testnet (OPBNB) is an EVM-compatible testnet. It is a testnet for Optimism Binance Smart Chain (OPBNB). Its ticker symbol is `BNB`.

## What is the Optimism Binance Smart Chain Testnet (OPBNB) (BNB) JSON-RPC API?

The JSON-RPC API is the standard interface for reading chain state, sending transactions, and interacting with smart contracts where supported.

## Making API requests

Send a POST request to `https://api.uniblock.dev/uni/v1/json-rpc?chainId=5611`. Include the JSON-RPC method and params in the request body.

## Supported networks

| Network                                      | Symbol | Type    | Chain ID |
| -------------------------------------------- | ------ | ------- | -------- |
| Optimism Binance Smart Chain (OPBNB)         | `BNB`  | Mainnet | `204`    |
| Optimism Binance Smart Chain Testnet (OPBNB) | `BNB`  | Testnet | `5611`   |

## API reference

Browse the available method groups for this chain:

* [Debug](/reference/jsonrpc-docs/5611/debug/debug-account-range)
* [EVM](/reference/jsonrpc-docs/5611/evm/eth-accounts)
* [Trace](/reference/jsonrpc-docs/5611/trace/trace-block)