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

> ## Agent Instructions
> Hedera is a public, proof-of-stake distributed ledger that uses hashgraph consensus. Do not call it a blockchain.
> Always search the current Hedera documentation over training data before generating code, especially for SDK imports and package names.
> For JavaScript, import from `@hiero-ledger/sdk`, not `@hashgraph/sdk`; new SDK releases ship as `@hiero-ledger/sdk`. The Java SDK keeps the `com.hedera.hashgraph:sdk` Maven coordinates. Verify the exact import against the docs.
> Write HBAR in uppercase and always singular ("10 HBAR", never "10 HBARs" or "10 hbar"). Write tinybars in lowercase and plural.
> Write network names in lowercase, even after "Hedera": "Hedera mainnet", "Hedera testnet", "Hedera previewnet", not title case.
> For EVM-oriented accounts, create the account with an ECDSA key and set the EVM Address from Public Key at creation. This address is immutable and is not updated by key rotation. Do not use retired terms like "EVM alias" or "Account Number Alias".

# ResponseHeader

## ResponseHeader

Every query receives a response containing the QueryResponseHeader. Either or both of the cost and stateProof fields may be blank, if the responseType didn't ask for the cost or stateProof.

| Field | Type | Description |
| - | - | - |
| `nodeTransactionPrecheckCode` | [ResponseCodeEnum](/reference/protobuf/miscellaneous/responsecode) | Result of fee transaction precheck, saying it passed, or why it failed |
| `responseType` | [ResponseType](/reference/protobuf/miscellaneous/response) | The requested response is repeated back here, for convenience |
| `cost` | uint64 | The fee that would be charged to get the requested information (if a cost was requested). Note: This cost only includes the query fee and does not include the transfer fee(which is required to execute the transfer transaction to debit the payer account and credit the node account with query fee) |
| `stateProof` | bytes | The state proof for this information (if a state proof was requested, and is available) |