# base_transactionStatus - Base RPC Method

Checks whether a transaction exists in the Base mempool. Returns `"Known"` if the transaction is pending in the mempool, or `"Unknown"` if it is not found (either already included in a block or never submitted).

This method is part of the `base_` namespace introduced with Flashblocks support.

Currently available on **Base Mainnet** only.

## Use Cases

- **Transaction tracking** — Check if a submitted transaction is still pending
- **Mempool monitoring** — Verify transaction propagation
- **Retry logic** — Determine whether to resubmit a transaction

## Request Parameters

- `transactionHash` (`DATA, required`): 32-byte transaction hash to look up

## Request Example

```json
{
  "jsonrpc": "2.0",
  "method": "base_transactionStatus",
  "params": ["0x..."],
  "id": 1
}
```

## Response Fields

- `status` (`String, required`): `"Known"` if the transaction is in the mempool, `"Unknown"` otherwise

## Successful Response

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "status": "Unknown"
  }
}
```

## Error Responses

### Invalid params

- Code: `-32602`
- Description: Invalid transaction hash format

## Code Examples

cURL
JavaScript
Python

```bash
curl -X POST https://api-base-mainnet-archive.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "base_transactionStatus",
    "params": ["0x5c884a466fb59ee69114a0c99cb15d4d8af670a37be53fd59ffda3b5566b4269"],
    "id": 1
  }'
```

```javascript
const response = await fetch(
  'https://api-base-mainnet-archive.n.dwellir.com/YOUR_API_KEY',
  {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      jsonrpc: '2.0',
      method: 'base_transactionStatus',
      params: ['0x5c884a466fb59ee69114a0c99cb15d4d8af670a37be53fd59ffda3b5566b4269'],
      id: 1,
    }),
  }
);

const data = await response.json();
console.log('Transaction status:', data.result.status);
// "Known" = in mempool, "Unknown" = not in mempool
```

```python
import requests

response = requests.post(
    'https://api-base-mainnet-archive.n.dwellir.com/YOUR_API_KEY',
    json={
        'jsonrpc': '2.0',
        'method': 'base_transactionStatus',
        'params': ['0x5c884a466fb59ee69114a0c99cb15d4d8af670a37be53fd59ffda3b5566b4269'],
        'id': 1
    }
)

result = response.json()['result']
print(f"Status: {result['status']}")
```

## Related Methods

- [`eth_getTransactionByHash`](https://www.dwellir.com/docs/base/eth_getTransactionByHash) — Get full transaction details
- [`eth_getTransactionReceipt`](https://www.dwellir.com/docs/base/eth_getTransactionReceipt) — Get transaction receipt
- [`eth_sendRawTransactionSync`](https://www.dwellir.com/docs/base/eth_sendRawTransactionSync) — Send transaction with synchronous confirmation

***

*Need help? Contact our [support team](mailto:support@dwellir.com) or check the [Base documentation](https://www.dwellir.com/docs/base).*