> ## 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.

# BlastChain Testnet (ETH) Overview

> Call BlastChain Testnet (chain ID 23888) through Uniblock's JSON-RPC endpoint, with a cURL example request and Debug and EVM method references.

BlastChain Testnet is an EVM-compatible testnet. Its ticker symbol is `ETH`. Use Uniblock's JSON-RPC endpoint to read chain state, send transactions, and interact with smart contracts through a single API surface across providers.

## Connect to BlastChain Testnet

Send JSON-RPC requests with `POST` to:

`https://api.uniblock.dev/uni/v1/json-rpc?chainId=23888`

Include the JSON-RPC method and parameters in the request body.

### Example request

Make a simple `eth_blockNumber` request with cURL:

```bash theme={null}
curl --request POST 'https://api.uniblock.dev/uni/v1/json-rpc?chainId=23888' \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: YOUR_UNIBLOCK_API_KEY' \
  --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'
```

## Supported networks

| Network            | Symbol | Type    | Chain ID |
| ------------------ | ------ | ------- | -------- |
| BlastChain Testnet | `ETH`  | Testnet | `23888`  |

## API reference

Browse the available method groups for this chain:

* [Debug](/reference/jsonrpc/23888/debug/debug-gc-stats)
* [EVM](/reference/jsonrpc/23888/evm/eth-accounts)