> For the complete documentation index, see [llms.txt](https://docs.getblock.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getblock.io/api-reference/avail/json-rpc-api.md). # JSON RPC API GetBlock provides fast and reliable access to Avail nodes via JSON-RPC API. Connect to the Avail network without running your own infrastructure. Avail's Substrate JSON-RPC methods, organized by namespace. These are request/response calls available over both the JSON-RPC (HTTP) and WebSocket interfaces. For pub-sub subscriptions, see the [WebSocket Subscriptions](/api-reference/avail/websocket-subscriptions-api.md) API. ## System | Method | Description | | ---------------------------------------------------------------------------------------------- | --------------------------------------- | | [system\_chain](/api-reference/avail/json-rpc-api/system_chain-avail.md) | Chain name | | [system\_health](/api-reference/avail/json-rpc-api/system_health-avail.md) | Node health and sync flags | | [system\_name](/api-reference/avail/json-rpc-api/system_name-avail.md) | Client implementation name | | [system\_version](/api-reference/avail/json-rpc-api/system_version-avail.md) | Client version | | [system\_properties](/api-reference/avail/json-rpc-api/system_properties-avail.md) | Token symbol, decimals, and SS58 format | | [system\_syncState](/api-reference/avail/json-rpc-api/system_syncstate-avail.md) | Sync progress heights | | [system\_accountNextIndex](/api-reference/avail/json-rpc-api/system_accountnextindex-avail.md) | Next nonce for an account | | [system\_chainType](/api-reference/avail/json-rpc-api/system_chaintype-avail.md) | Chain type: Live, Local, or Development | | [system\_nodeRoles](/api-reference/avail/json-rpc-api/system_noderoles-avail.md) | Node roles | ## Chain | Method | Description | | ---------------------------------------------------------------------------------------------- | ------------------------------- | | [chain\_getBlock](/api-reference/avail/json-rpc-api/chain_getblock-avail.md) | Full block by hash, or latest | | [chain\_getBlockHash](/api-reference/avail/json-rpc-api/chain_getblockhash-avail.md) | Block hash by number, or latest | | [chain\_getHeader](/api-reference/avail/json-rpc-api/chain_getheader-avail.md) | Block header by hash, or latest | | [chain\_getFinalizedHead](/api-reference/avail/json-rpc-api/chain_getfinalizedhead-avail.md) | Latest finalized block hash | | [chain\_getRuntimeVersion](/api-reference/avail/json-rpc-api/chain_getruntimeversion-avail.md) | Runtime version at a block | ## State | Method | Description | | ---------------------------------------------------------------------------------------------- | ------------------------------------ | | [state\_getRuntimeVersion](/api-reference/avail/json-rpc-api/state_getruntimeversion-avail.md) | Runtime version and APIs | | [state\_getMetadata](/api-reference/avail/json-rpc-api/state_getmetadata-avail.md) | Runtime metadata in SCALE hex | | [state\_getStorage](/api-reference/avail/json-rpc-api/state_getstorage-avail.md) | Raw storage value by key | | [state\_getKeysPaged](/api-reference/avail/json-rpc-api/state_getkeyspaged-avail.md) | Paged storage keys under a prefix | | [state\_queryStorageAt](/api-reference/avail/json-rpc-api/state_querystorageat-avail.md) | Values for multiple keys at a block | | [state\_getKeys](/api-reference/avail/json-rpc-api/state_getkeys-avail.md) | Storage keys under a prefix, unpaged | | [state\_getStorageHash](/api-reference/avail/json-rpc-api/state_getstoragehash-avail.md) | Hash of a storage value | | [state\_getReadProof](/api-reference/avail/json-rpc-api/state_getreadproof-avail.md) | Merkle proof for storage keys | | [state\_call](/api-reference/avail/json-rpc-api/state_call-avail.md) | Invoke a runtime API | ## Childstate | Method | Description | | ------------------------------------------------------------------------------------------ | -------------------------- | | [childstate\_getStorage](/api-reference/avail/json-rpc-api/childstate_getstorage-avail.md) | Value in a child trie | | `childstate_getStorageHash` | Hash of a child-trie value | ## Author | Method | Description | | ------------------------------------------------------------------------------------------------ | ------------------------- | | [author\_submitExtrinsic](/api-reference/avail/json-rpc-api/author_submitextrinsic-avail.md) | Submit a signed extrinsic | | [author\_pendingExtrinsics](/api-reference/avail/json-rpc-api/author_pendingextrinsics-avail.md) | Extrinsics in the pool | ## Payment | Method | Description | | ---------------------------------------------------------------------------------------------- | ----------------------------- | | [payment\_queryInfo](/api-reference/avail/json-rpc-api/payment_queryinfo-avail.md) | Estimate fee for an extrinsic | | [payment\_queryFeeDetails](/api-reference/avail/json-rpc-api/payment_queryfeedetails-avail.md) | Detailed fee breakdown | ## New JSON-RPC (v1) | Method | Description | | ------------------------------------------------------------------------------------------------- | ----------------------- | | [chainSpec\_v1\_chainName](/api-reference/avail/json-rpc-api/chainspec_v1_chainname-avail.md) | Chain name | | [chainSpec\_v1\_genesisHash](/api-reference/avail/json-rpc-api/chainspec_v1_genesishash-avail.md) | Genesis hash | | [chainSpec\_v1\_properties](/api-reference/avail/json-rpc-api/chainspec_v1_properties-avail.md) | Chain properties | | [transaction\_v1\_broadcast](/api-reference/avail/json-rpc-api/transaction_v1_broadcast-avail.md) | Broadcast a transaction | ## RPC | Method | Description | | ---------------------------------------------------------------------- | -------------------------- | | [rpc\_methods](/api-reference/avail/json-rpc-api/rpc_methods-avail.md) | List available RPC methods | ## Support | Contact | | --------------------- | | |