import {
  DocBlock,
  DocSideBySide,
  CodeParams,
  Parameter,
  Field,
  Values,
  CodeSnippets,
} from "../../../components/CodeDocBlock";

<DocBlock>

## getFeeCalculatorForBlockhash

:::warning DEPRECATED
This method is expected to be removed in solana-core v2.0
**Please use [isBlockhashValid](#isblockhashvalid) or [getFeeForMessage](#getfeeformessage) instead**
:::

Returns the fee calculator associated with the query blockhash, or `null` if the blockhash has expired

<DocSideBySide>

<CodeParams>

### Parameters:

<Parameter type={"string"} required={true}>
  query blockhash, as a base-58 encoded string
</Parameter>

<Parameter type={"object"} optional={true}>

Configuration object containing the following fields:

<Field
  name="commitment"
  type="string"
  optional={true}
  href="/api/http#configuring-state-commitment"
></Field>

<Field name="minContextSlot" type="number" optional={true}>
  The minimum slot that the request can be evaluated at
</Field>

</Parameter>

### Result:

The result will be an RpcResponse JSON object with `value` equal to:

- `<null>` - if the query blockhash has expired; or
- `<object>` - otherwise, a JSON object containing:
  - `feeCalculator: <object>` - `FeeCalculator` object describing the cluster fee rate at the queried blockhash

</CodeParams>

<CodeSnippets>

### Code sample:

```bash
curl http://localhost:8899 -X POST -H "Content-Type: application/json" -d '
  {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getFeeCalculatorForBlockhash",
    "params": [
      "GJxqhuxcgfn5Tcj6y3f8X4FeCDd2RQ6SnEMo1AAxrPRZ"
    ]
  }
'
```

### Response:

```json
{
  "jsonrpc": "2.0",
  "result": {
    "context": {
      "slot": 221
    },
    "value": {
      "feeCalculator": {
        "lamportsPerSignature": 5000
      }
    }
  },
  "id": 1
}
```

</CodeSnippets>
</DocSideBySide>
</DocBlock>
