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Kusama

Kusama JSON-RPC API

The public Substrate JSON-RPC 2.0 interface to the Kusama relay chain. Probed live on 2026-07-19: 130 methods are advertised by rpc_methods, spanning chain (blocks/headers), state (storage, metadata, runtime version), author (extrinsic submission), system (health, properties, peers), payment (fee queries), and the newer spec-versioned chainHead_v1 / archive_v1 / transaction_v1 / transactionWatch_v1 families defined by the Polkadot JSON-RPC interface specification. Available over HTTPS (request/response) and WSS (subscriptions). No authentication.

Documentation Provider Profile APIs.io AsyncAPI GitHub

Kusama JSON-RPC API is one of 21 APIs that Kusama publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include JSON-RPC, Blockchain, and Substrate. The published artifact set on APIs.io includes an AsyncAPI specification.

This event API exposes 0 operations across 10 channels, and defines 6 schemas. It is described by AsyncAPI 3.0.0, at version 1.24.0-660acefe665.

The API connects through a single server, kusama-rpc.polkadot.io (wss).

0 operations 10 channels 6 schemas

Metadata

The identity and technical contract details declared by the specification.

Specification
AsyncAPI 3.0.0
API Version
1.24.0-660acefe665
Base URL
https://kusama-rpc.polkadot.io/
Contact
Polkadot JSON-RPC interface specification
License
GPL-3.0

Messages & Schemas 6

The contract defines 6 schemas that model the data carried by its messages. Each schema is shown below with its type and property counts.

FollowEvent
message
One of: initialized, newBlock, bestBlockChanged, finalized, operationBodyDone, operationCallDone, operationStorageItems, operationStorageDone, operationWaiting…
BlockHeader
message
StorageChangeSet
message
RuntimeVersion
message
TransactionStatus
message
Progresses through: validated, broadcasted, bestChainBlockIncluded, finalized — or terminates with invalid, dropped, or error. Only finalized is safe to treat…
Justification
message

Specification

The full machine-readable AsyncAPI contract behind this narrative.

Source

kusama-jsonrpc-asyncapi.yml Raw ↑

Other APIs Kusama publishes across the network.

Kusama accounts API
AE Profile APIs.io
Kusama ahm API
AE Profile APIs.io
Kusama blocks API
AE Profile APIs.io
Kusama contracts API
AE Profile APIs.io
Kusama coretime API
AE Profile APIs.io
Kusama node API
AE Profile APIs.io
Kusama pallets API
AE Profile APIs.io
Kusama paras API
AE Profile APIs.io
Kusama rc accounts API
AE Profile APIs.io
Kusama rc API
AE Profile APIs.io
Kusama rc blocks API
AE Profile APIs.io
Kusama rc node API
AE Profile APIs.io
#JSON-RPC#Blockchain#Substrate
← Back to K APIs
API Details
ID
kusama:json-rpc
Base URL
https://kusama-rpc.polkadot.io/
Docs
https://paritytech.github.io/json-rpc-interface-spec/
Provider
Kusama
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