Polkadot RPC API

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See the Polkadot RPC API connection guide.

`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