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

# base_transactionStatus

> Checks whether a transaction is in the node mempool. Only available on Flashblocks endpoints.

Checks whether a specific transaction is present in the node's mempool. Use this to confirm that a submitted transaction has been received before it appears in a Flashblock.

<Info>
  Only available on Flashblocks endpoints: `https://mainnet.base.org` / `https://sepolia.base.org`.
</Info>

<Note>
  Requires [base/base](https://github.com/base/base) minimum client version v0.3.0.
</Note>

## Parameters

<ParamField body="transactionHash" type="string" required>
  The 32-byte transaction hash to query.
</ParamField>

## Returns

<ResponseField name="result" type="object">
  Transaction status object.

  <Expandable title="Status fields">
    <ResponseField name="status" type="string">
      `"Known"` if the transaction is present in the mempool. `"Unknown"` if it has not been seen by this node.
    </ResponseField>
  </Expandable>
</ResponseField>

## Example

<CodeGroup>
  ```bash cURL theme={null}
  curl https://mainnet.base.org \
    -X POST -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"base_transactionStatus","params":["0xabc123..."],"id":1}'
  ```

  ```json Known theme={null}
  {"jsonrpc": "2.0", "id": 1, "result": {"status": "Known"}}
  ```

  ```json Unknown theme={null}
  {"jsonrpc": "2.0", "id": 1, "result": {"status": "Unknown"}}
  ```
</CodeGroup>