--- updatedAt: 2026-08-19T15:59:52.000Z --- Fetch the complete documentation index at: https://docs.blockdaemon.com/llms.txt. Use this file to discover all available pages before exploring further. Append .md to any documentation page URL to get its markdown version. # Polkadot RPC > 📘 > > See the [Polkadot RPC API connection guide](https://docs.blockdaemon.com/docs/access-polkadot-rpc-via-substrate-rpc-api). ### `author` | Method | Notes | Compute Unit Value | | ------------------------ | -------------------------------------------------------------------------- | ------------------ | | `author_submitExtrinsic` | Submits an encoded extrinsic to the transaction pool and returns its hash. | 100 | ### `chain` | Method | Notes | Compute Unit Value | | --------------------------------- | ------------------------------------------------------------------------------------------------------ | ------------------ | | `chain_getBlock` | Returns the signed block and available justifications for a block hash or the best block when omitted. | 5 | | `chain_getBlockHash` | Returns the hash of a block at a specified height or the best block hash when omitted. | 1 | | `chain_getFinalizedHead` | Returns the hash of the most recently finalized block. | 1 | | `chain_getHeader` | Returns the header for a block hash or the best block when omitted. | 5 | | `chain_subscribeAllHeads` | Subscribes to notifications produced by `chain_subscribeAllHeads`. | 1 | | `chain_subscribeFinalizedHeads` | Subscribes to notifications produced by `chain_subscribeFinalizedHeads`. | 1 | | `chain_subscribeNewHeads` | Subscribes to notifications produced by `chain_subscribeNewHeads`. | 1 | | `chain_unsubscribeAllHeads` | Cancels the subscription identified by the supplied subscription identifier. | 1 | | `chain_unsubscribeFinalizedHeads` | Cancels the subscription identified by the supplied subscription identifier. | 1 | | `chain_unsubscribeNewHeads` | Cancels the subscription identified by the supplied subscription identifier. | 1 | ### `childstate` | Method | Notes | Compute Unit Value | | ------------------------------ | ----------------------------------------------------------- | ------------------ | | `childstate_getKeys` | Returns keys that begin with a supplied prefix. | 10 | | `childstate_getKeysPaged` | Returns one page of keys that begin with a supplied prefix. | 10 | | `childstate_getStorage` | Returns a stored value at an optional block hash. | 10 | | `childstate_getStorageEntries` | Returns a stored value at an optional block hash. | 10 | | `childstate_getStorageHash` | Returns the hash of a stored value. | 1 | | `childstate_getStorageSize` | Returns the byte size of a stored value. | 1 | ### `contracts` | Method | Notes | Compute Unit Value | | -------------------------- | ---------------------------------------------------------------------------- | ------------------ | | `contracts_call` | Executes a contract call against state without submitting a transaction. | 10 | | `contracts_getStorage` | Returns a stored value at an optional block hash. | 10 | | `contracts_instantiate` | Returns the result of the `contracts_instantiate` contract RPC operation. | 50 | | `contracts_rentProjection` | Returns the result of the `contracts_rentProjection` contract RPC operation. | 5 | | `contracts_upload_code` | Returns the result of the `contracts_upload_code` contract RPC operation. | 50 | ### `grandpaApi` | Method | Notes | Compute Unit Value | | ----------------------------------- | ---------------------------------------------------------------------------- | ------------------ | | `grandpa_proveFinality` | Generates a GRANDPA finality proof for a block. | 5 | | `grandpa_roundState` | Returns the current GRANDPA round state. | 1 | | `grandpa_subscribeJustifications` | Subscribes to notifications produced by `grandpa_subscribeJustifications`. | 1 | | `grandpa_unsubscribeJustifications` | Cancels the subscription identified by the supplied subscription identifier. | 1 | ### `mmr` | Method | Notes | Compute Unit Value | | ------------------------ | ------------------------------------------------- | ------------------ | | `mmr_generateBatchProof` | Generates an MMR proof for a set of leaf indices. | 5 | | `mmr_generateProof` | Generates an MMR proof for a leaf index. | 5 | ### `offchain` | Method | Notes | Compute Unit Value | | -------------------------- | --------------------------------------------------- | ------------------ | | `offchain_localStorageGet` | Reads a value from the node local offchain storage. | 5 | | `offchain_localStorageSet` | Writes a value to the node local offchain storage. | 100 | ### `payment` | Method | Notes | Compute Unit Value | | ------------------------- | -------------------------------------------------------------- | ------------------ | | `payment_queryFeeDetails` | Returns the fee breakdown for an encoded extrinsic. | 5 | | `payment_queryInfo` | Returns dispatch and fee information for an encoded extrinsic. | 5 | ### `rpc` | Method | Notes | Compute Unit Value | | ------------- | -------------------------------------------- | ------------------ | | `rpc_methods` | Returns the RPC methods exposed by the node. | 1 | ### `state` | Method | Notes | Compute Unit Value | | --------------------------------- | ----------------------------------------------------------------------------------- | ------------------ | | `state_call` | Calls a runtime API method against state at an optional block hash. | 5 | | `state_getChildKeys` | Returns the result defined by the `state_getChildKeys` Substrate RPC method. | 5 | | `state_getChildReadProof` | Returns the result defined by the `state_getChildReadProof` Substrate RPC method. | 5 | | `state_getChildStorage` | Returns the result defined by the `state_getChildStorage` Substrate RPC method. | 5 | | `state_getChildStorageHash` | Returns the result defined by the `state_getChildStorageHash` Substrate RPC method. | 5 | | `state_getChildStorageSize` | Returns the result defined by the `state_getChildStorageSize` Substrate RPC method. | 5 | | `state_getKeys` | Returns keys that begin with a supplied prefix. | 5 | | `state_getKeysPaged` | Returns one page of keys that begin with a supplied prefix. | 5 | | `state_getMetadata` | Returns SCALE-encoded runtime metadata at an optional block hash. | 10 | | `state_getPairs` | Returns key-value pairs for state keys that begin with a supplied prefix. | 5 | | `state_getReadProof` | Returns a storage read proof for supplied keys. | 5 | | `state_getRuntimeVersion` | Returns the runtime version at an optional block hash. | 5 | | `state_getStorage` | Returns a stored value at an optional block hash. | 5 | | `state_getStorageHash` | Returns the hash of a stored value. | 5 | | `state_getStorageSize` | Returns the byte size of a stored value. | 5 | | `state_queryStorage` | Returns changes to supplied storage keys across a block range. | 5 | | `state_queryStorageAt` | Returns changes to supplied storage keys at a block or the best block. | 5 | | `state_subscribeRuntimeVersion` | Subscribes to notifications produced by `state_subscribeRuntimeVersion`. | 1 | | `state_subscribeStorage` | Subscribes to notifications produced by `state_subscribeStorage`. | 1 | | `state_traceBlock` | Returns state-access traces for executing a block. | 100 | | `state_trieMigrationStatus` | Returns the current trie-migration status. | 100 | | `state_getStorageAt` | Returns the value stored under a state key at a specified block hash. | 5 | | `state_unsubscribeRuntimeVersion` | Cancels the subscription identified by the supplied subscription identifier. | 1 | | `state_unsubscribeStorage` | Cancels the subscription identified by the supplied subscription identifier. | 1 | ### `syncstate` | Method | Notes | Compute Unit Value | | ------------------------ | -------------------------------------------------- | ------------------ | | `sync_state_genSyncSpec` | Generates the chain synchronization specification. | 100 | ### `system` | Method | Notes | Compute Unit Value | | ----------------------------- | ----------------------------------------------------------------------------- | ------------------ | | `system_accountNextIndex` | Returns the next usable account nonce while considering the transaction pool. | 5 | | `system_addReservedPeer` | Adds a peer to the reserved-peer set. | 5 | | `system_chain` | Returns the result defined by the `system_chain` Substrate RPC method. | 1 | | `system_chainType` | Returns the result defined by the `system_chainType` Substrate RPC method. | 1 | | `system_dryRun` | Simulates an encoded extrinsic without broadcasting it. | 10 | | `system_health` | Returns the node health summary. | 1 | | `system_localListenAddresses` | Returns the node local listening addresses. | 100 | | `system_localPeerId` | Returns the result defined by the `system_localPeerId` Substrate RPC method. | 5 | | `system_name` | Returns the node implementation name. | 1 | | `system_networkState` | Returns the node network state. | 1 | | `system_nodeRoles` | Returns the node roles. | 1 | | `system_peers` | Returns the peers connected to the node. | 5 | | `system_properties` | Returns the chain properties. | 1 | | `system_removeReservedPeer` | Removes a peer from the reserved-peer set. | 100 | | `system_reservedPeers` | Returns the reserved-peer set. | 100 | | `system_resetLogFilter` | Resets the node log filter to its default. | 5 | | `system_syncState` | Returns the node synchronization state. | 1 | | `system_version` | Returns the node implementation version. | 1 | ### `babe` | Method | Notes | Compute Unit Value | | ---------------------- | -------------------------------------------------------------- | ------------------ | | `babe_epochAuthorship` | Returns the expected BABE authorship information for an epoch. | 5 | ### `beefy` | Method | Notes | Compute Unit Value | | --------------------------------- | ---------------------------------------------------------------------------- | ------------------ | | `beefy_getFinalizedHead` | Returns the latest block hash finalized by BEEFY. | 1 | | `beefy_subscribeJustifications` | Subscribes to BEEFY finality justifications. | 1 | | `beefy_unsubscribeJustifications` | Cancels the subscription identified by the supplied subscription identifier. | 1 |