# state

### **call(method: `Text`, data: `Bytes`, at?: `BlockHash`): `Bytes`**

* **interface**: `api.rpc.state.call`
* **jsonrpc**: `state_call` (alias=`state_callAt`)
* **summary**: Calls a contract (pallet) at a block's state.

### **getChildReadProof(childStorageKey: `PrefixedStorageKey`, keys: `Vec<StorageKey>`, at?: `BlockHash`): `ReadProof`**

* **interface**: `api.rpc.state.getChildReadProof`
* **jsonrpc**: `state_getChildReadProof`
* **summary**: Returns proof of storage for child key entries at a specific block state.

### **getKeys(key: `StorageKey`, at?: `BlockHash`): `Vec<StorageKey>`**

* **interface**: `api.rpc.state.getKeys`
* **jsonrpc**: `state_getKeys`
* **summary**: Retrieves the keys with a certain prefix.
* **deprecated**: Use `api.rpc.state.getKeysPaged` to retrieve keys.

### **getKeysPaged(key: `StorageKey`, count: `u32`, startKey?: `StorageKey`, at?: `BlockHash`): `Vec<StorageKey>`**

* **interface**: `api.rpc.state.getKeysPaged`
* **jsonrpc**: `state_getKeysPaged` (alias=`state_getKeysPagedAt`)
* **summary**: Returns the keys with prefix with pagination support.

### **getMetadata(at?: `BlockHash`): `Metadata`**

* **interface**: `api.rpc.state.getMetadata`
* **jsonrpc**: `state_getMetadata`
* **summary**: Returns the runtime metadata.

### **getPairs(prefix: `StorageKey`, at?: `BlockHash`): `Vec<KeyValue>`**

* **interface**: `api.rpc.state.getPairs`
* **jsonrpc**: `state_getPairs`
* **summary**: Returns the keys with prefix, leaves empty to get all the keys (deprecated: Use getKeysPaged).
* **deprecated**: Use `api.rpc.state.getKeysPaged` to retrieve keys.

### **getReadProof(keys: `Vec<StorageKey>`, at?: `BlockHash`): `ReadProof`**

* **interface**: `api.rpc.state.getReadProof`
* **jsonrpc**: `state_getReadProof`
* **summary**: Returns proof of storage entries at a specific block state.

### **getRuntimeVersion(at?: `BlockHash`): `RuntimeVersion`**

* **interface**: `api.rpc.state.getRuntimeVersion`
* **jsonrpc**: `state_getRuntimeVersion` (alias=`chain_getRuntimeVersion`)
* **summary**: Gets the runtime version.

### **getStorage(key: `StorageKey`, at?: `BlockHash`): `StorageData`**

* **interface**: `api.rpc.state.getStorage`
* **jsonrpc**: `state_getStorage` (alias=`state_getStorageAt`)
* **summary**: Retrieves the storage for a key.

### **getStorageHash(key: `StorageKey`, at?: `BlockHash`): `Hash`**

* **interface**: `api.rpc.state.getStorageHash`
* **jsonrpc**: `state_getStorageHash` (alias=`state_getStorageHashAt`)
* **summary**: Retrieves the storage hash.

### **getStorageSize(key: `StorageKey`, at?: `BlockHash`): `u64`**

* **interface**: `api.rpc.state.getStorageSize`
* **jsonrpc**: `state_getStorageSize` (alias=`state_getStorageSizeAt`)
* **summary**: Retrieves the storage size.

### **queryStorage(keys: `Vec<StorageKey>`, fromBlock: `Hash`, toBlock?: `BlockHash`): `Vec<StorageChangeSet>`**

* **interface**: `api.rpc.state.queryStorage`
* **jsonrpc**: `state_queryStorage`
* **summary**: Queries historical storage entries (by key) starting from a start block.

### **queryStorageAt(keys: `Vec<StorageKey>`, at?: `BlockHash`): `Vec<StorageChangeSet>`**

* **interface**: `api.rpc.state.queryStorageAt`
* **jsonrpc**: `state_queryStorageAt`
* **summary**: Queries storage entries (by key) starting at block hash given as the second parameter.

### **subscribeRuntimeVersion(): `RuntimeVersion`**

* **interface**: `api.rpc.state.subscribeRuntimeVersion`
* **jsonrpc**: `state_subscribeRuntimeVersion`
* **summary**: Retrieves the runtime version via subscription.

### **subscribeStorage(keys?: `Vec<StorageKey>`): `StorageChangeSet`**

* **interface**: `api.rpc.state.subscribeStorage`
* **jsonrpc**: `state_subscribeStorage`
* **summary**: Subscribes to storage changes for the provided keys.

### **traceBlock(block: `Hash`, targets: `Option<Text>`, storageKeys: `Option<Text>`, methods: `Option<Text>`): `TraceBlockResponse`**

* **interface**: `api.rpc.state.traceBlock`
* **jsonrpc**: `state_traceBlock`
* **summary**: Provides a way to trace the re-execution of a single block.


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