Kusama

Kusama is the permissionless, unaudited canary network of the Polkadot ecosystem, running the same Polkadot SDK (Substrate/FRAME) runtime as Polkadot but with faster governance, lower barriers to entry, and real economic conditions — it is where runtime upgrades, parachain/coretime mechanics, and governance changes ship first before reaching Polkadot. Its developer surface is a chain interface rather than a hosted SaaS API: a public Substrate JSON-RPC 2.0 endpoint at kusama-rpc.polkadot.io exposing 130 live methods (chain, state, author, system, payment, plus the newer chainHead/archive/transaction v1 families) over HTTP and WebSocket, and a REST projection of the same chain state via Substrate API Sidecar at kusama-public-sidecar.parity-chains.parity.io, documented by a 119-operation OpenAPI 3.0 specification. Access is unauthenticated and public-read; write access happens by submitting SCALE-encoded, key-signed extrinsics. The native token is KSM (12 decimals, SS58 prefix 2).

Kusama publishes 21 API contracts indexed on the APIs.io network, including JSON-RPC API, Accounts API, Ahm API, and 18 more. Tagged areas include Company, Cryptocurrency, Blockchain, Web3, and Polkadot.

The Kusama catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Kusama’s developer surface includes documentation, API reference, getting-started guide, support, CLI, authentication, changelog, and 23 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

50.2/100 developing ▬ flat Agent 26/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessOpen

1 published contract 4 Agent Skills

Company Cryptocurrency Blockchain Web3 Polkadot Substrate JSON-RPC Blockchain Data Staking Governance Real-Time

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 50.2/100 · developing

Contract Quality 10.1 / 19

Developer Ergonomics 11.7 / 15

Access Clarity 3.2 / 15

Operational Transparency 4.4 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 4.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 21.1 — up to +15.8 composite points
Contract Quality scores 53.9 — up to +11.5 composite points
Contract Governance scores 18.2 — up to +9.8 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/kusama/apis.yml: open an issue on github.com/api-evangelist/kusama to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

JSON RPC

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

AsyncAPI

measured — observed by APIs.io (published)

APIs 21

Individual APIs this provider publishes, each with its own machine-readable definition.

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), sta...

Kusama Accounts API

The accounts API from Kusama — 11 operation(s) for accounts.

Kusama Ahm API

Asset Hub Migration information

Kusama Blocks API

The blocks API from Kusama — 8 operation(s) for blocks.

Kusama Contracts API

The contracts API from Kusama — 1 operation(s) for contracts.

Kusama Coretime API

The coretime API from Kusama — 6 operation(s) for coretime.

Kusama Node API

node connected to sidecar

Kusama Pallets API

pallets employed in the runtime

Kusama Paras API

The paras API from Kusama — 9 operation(s) for paras.

Kusama rc accounts API

The rc accounts API from Kusama — 5 operation(s) for rc accounts.

Kusama Rc API

relay chain specific endpoints for asset hub

Kusama rc blocks API

The rc blocks API from Kusama — 8 operation(s) for rc blocks.

Kusama rc node API

The rc node API from Kusama — 3 operation(s) for rc node.

Kusama rc pallets API

The rc pallets API from Kusama — 13 operation(s) for rc pallets.

Kusama rc runtime API

The rc runtime API from Kusama — 5 operation(s) for rc runtime.

Kusama rc staking API

The rc staking API from Kusama — 4 operation(s) for rc staking.

Kusama rc transaction API

The rc transaction API from Kusama — 5 operation(s) for rc transaction.

Kusama Runtime API

The runtime API from Kusama — 5 operation(s) for runtime.

Kusama Staking API

The staking API from Kusama — 4 operation(s) for staking.

Kusama Trace API

The trace API from Kusama — 4 operation(s) for trace.

Kusama Transaction API

The transaction API from Kusama — 6 operation(s) for transaction.

Scroll for all 21

Open Collections 20

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Substrate API Sidecar accounts API

OPEN COLLECTION

Substrate API Sidecar accounts ahm API

OPEN COLLECTION

Substrate API Sidecar accounts blocks API

OPEN COLLECTION

Substrate API Sidecar accounts contracts API

OPEN COLLECTION

Substrate API Sidecar accounts coretime API

OPEN COLLECTION

Substrate API Sidecar accounts node API

OPEN COLLECTION

Substrate API Sidecar accounts pallets API

OPEN COLLECTION

Substrate API Sidecar accounts paras API

OPEN COLLECTION

Substrate API Sidecar accounts rc accounts API

OPEN COLLECTION

Substrate API Sidecar accounts rc API

OPEN COLLECTION

Substrate API Sidecar accounts rc blocks API

OPEN COLLECTION

Substrate API Sidecar accounts rc node API

OPEN COLLECTION

Substrate API Sidecar accounts rc pallets API

OPEN COLLECTION

Substrate API Sidecar accounts rc runtime API

OPEN COLLECTION

Substrate API Sidecar accounts rc staking API

OPEN COLLECTION

Substrate API Sidecar accounts rc transaction API

OPEN COLLECTION

Substrate API Sidecar accounts runtime API

OPEN COLLECTION

Substrate API Sidecar accounts staking API

OPEN COLLECTION

Substrate API Sidecar accounts trace API

OPEN COLLECTION

Substrate API Sidecar accounts transaction API

OPEN COLLECTION

Scroll for all 20

Agent Skills 4

Packaged agent skills for driving this provider's APIs from an AI assistant.

kusama-explore-chain-state

AGENT SKILL

kusama-follow-finalized-blocks

AGENT SKILL

kusama-read-account-state

AGENT SKILL

kusama-submit-transaction

AGENT SKILL

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Kusama JSON-RPC Subscription API

The event/streaming surface of the Kusama relay chain, served over WebSocket at wss://kusama-rpc.polkadot.io. Kusama publishes no webhooks — there is no vendor to register a cal...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Kusama API Rules

58 rules · 44 errors 11 warnings 3 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Kusama Sidecar Overlay

12 actions · update · kusama-sidecar-openapi.yaml

DERIVED

Examples 2

Example request and response payloads for these APIs.

Kusama Jsonrpc Examples

6 fields

EXAMPLE

Kusama Rpc Methods

3 fields

EXAMPLE

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Kusama Authentication

0 schemes

SECURITY

Kusama Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Kusama Vulnerability Disclosure

no policy recorded

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

LLMsTxt

AgentSkill

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

Conformance

Lifecycle

Webhooks

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 4

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Operate 4

Status, limits, changes, and where to get help

Support

Community

Deprecation

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: kusama
name: Kusama
description: 'Kusama is the permissionless, unaudited canary network of the Polkadot ecosystem, running the same Polkadot
  SDK (Substrate/FRAME) runtime as Polkadot but with faster governance, lower barriers to entry, and real economic conditions
  — it is where runtime upgrades, parachain/coretime mechanics, and governance changes ship first before reaching Polkadot.
  Its developer surface is a chain interface rather than a hosted SaaS API: a public Substrate JSON-RPC 2.0 endpoint at kusama-rpc.polkadot.io
  exposing 130 live methods (chain, state, author, system, payment, plus the newer chainHead/archive/transaction v1 families)
  over HTTP and WebSocket, and a REST projection of the same chain state via Substrate API Sidecar at kusama-public-sidecar.parity-chains.parity.io,
  documented by a 119-operation OpenAPI 3.0 specification. Access is unauthenticated and public-read; write access happens
  by submitting SCALE-encoded, key-signed extrinsics. The native token is KSM (12 decimals, SS58 prefix 2).'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: medium
  source:
  - authentication
  - security
  - sandbox
  generated: '2026-11-06'
  method: derived
image: https://kusama.network/images/kusama-logo-canary-white.png
url: https://raw.githubusercontent.com/api-evangelist/kusama/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- pantera-capital
x-tier: profiled
x-tier-reason: enriched-from-public-surface
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
x-docs-platform: mkdocs
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
x-docs-hosting: github-pages
tags:
- Company
- Cryptocurrency
- Blockchain
- Web3
- Polkadot
- Substrate
- JSON-RPC
- Blockchain Data
- Staking
- Governance
- Real-Time
tags_raw:
- Company
- Crypto
- Blockchain
- Web3
- Polkadot
- Substrate
- JSON-RPC
- Blockchain Data
- Staking
- Governance
- Real-Time
apis:
- aid: kusama:json-rpc
  name: Kusama JSON-RPC API
  description: '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.'
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - JSON-RPC
  - Blockchain
  - Substrate
  properties:
  - type: Examples
    url: examples/kusama-jsonrpc-examples.json
  - type: AsyncAPI
    url: asyncapi/kusama-jsonrpc-asyncapi.yml
- aid: kusama:kusama-accounts-api
  name: Kusama Accounts API
  description: The accounts API from Kusama — 11 operation(s) for accounts.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Account
  tags_raw:
  - accounts
  properties:
  - type: OpenAPI
    url: openapi/kusama-accounts-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-ahm-api
  name: Kusama Ahm API
  description: Asset Hub Migration information
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - ahm
  properties:
  - type: OpenAPI
    url: openapi/kusama-ahm-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-blocks-api
  name: Kusama Blocks API
  description: The blocks API from Kusama — 8 operation(s) for blocks.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Blocks
  tags_raw:
  - blocks
  properties:
  - type: OpenAPI
    url: openapi/kusama-blocks-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-contracts-api
  name: Kusama Contracts API
  description: The contracts API from Kusama — 1 operation(s) for contracts.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Contracts
  tags_raw:
  - contracts
  properties:
  - type: OpenAPI
    url: openapi/kusama-contracts-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-coretime-api
  name: Kusama Coretime API
  description: The coretime API from Kusama — 6 operation(s) for coretime.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - coretime
  properties:
  - type: OpenAPI
    url: openapi/kusama-coretime-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-node-api
  name: Kusama Node API
  description: node connected to sidecar
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Node
  tags_raw:
  - node
  properties:
  - type: OpenAPI
    url: openapi/kusama-node-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-pallets-api
  name: Kusama Pallets API
  description: pallets employed in the runtime
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - pallets
  properties:
  - type: OpenAPI
    url: openapi/kusama-pallets-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-paras-api
  name: Kusama Paras API
  description: The paras API from Kusama — 9 operation(s) for paras.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - paras
  properties:
  - type: OpenAPI
    url: openapi/kusama-paras-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-accounts-api
  name: Kusama rc accounts API
  description: The rc accounts API from Kusama — 5 operation(s) for rc accounts.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc accounts
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-accounts-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-api
  name: Kusama Rc API
  description: relay chain specific endpoints for asset hub
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-blocks-api
  name: Kusama rc blocks API
  description: The rc blocks API from Kusama — 8 operation(s) for rc blocks.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc blocks
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-blocks-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-node-api
  name: Kusama rc node API
  description: The rc node API from Kusama — 3 operation(s) for rc node.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc node
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-node-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-pallets-api
  name: Kusama rc pallets API
  description: The rc pallets API from Kusama — 13 operation(s) for rc pallets.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc pallets
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-pallets-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-runtime-api
  name: Kusama rc runtime API
  description: The rc runtime API from Kusama — 5 operation(s) for rc runtime.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc runtime
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-runtime-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-staking-api
  name: Kusama rc staking API
  description: The rc staking API from Kusama — 4 operation(s) for rc staking.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc staking
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-staking-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-rc-transaction-api
  name: Kusama rc transaction API
  description: The rc transaction API from Kusama — 5 operation(s) for rc transaction.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - rc transaction
  properties:
  - type: OpenAPI
    url: openapi/kusama-rc-transaction-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-runtime-api
  name: Kusama Runtime API
  description: The runtime API from Kusama — 5 operation(s) for runtime.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Runtime
  tags_raw:
  - runtime
  properties:
  - type: OpenAPI
    url: openapi/kusama-runtime-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-staking-api
  name: Kusama Staking API
  description: The staking API from Kusama — 4 operation(s) for staking.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Staking
  tags_raw:
  - staking
  properties:
  - type: OpenAPI
    url: openapi/kusama-staking-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-trace-api
  name: Kusama Trace API
  description: The trace API from Kusama — 4 operation(s) for trace.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Trace
  tags_raw:
  - trace
  properties:
  - type: OpenAPI
    url: openapi/kusama-trace-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
- aid: kusama:kusama-transaction-api
  name: Kusama Transaction API
  description: The transaction API from Kusama — 6 operation(s) for transaction.
  humanURL: https://paritytech.github.io/json-rpc-interface-spec/
  baseURL: https://kusama-rpc.polkadot.io/
  tags:
  - Transaction
  tags_raw:
  - transaction
  properties:
  - type: OpenAPI
    url: openapi/kusama-transaction-api-openapi.yml
  - type: ErrorCatalog
    url: errors/kusama-problem-types.yml
  - type: DataModel
    url: data-model/kusama-data-model.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/kusama-sidecar-overlay.yaml
- type: Website
  url: https://kusama.network/
- type: DeveloperPortal
  url: https://docs.polkadot.com/
- type: Documentation
  url: https://docs.polkadot.com/chain-interactions/
- type: APIReference
  url: https://paritytech.github.io/json-rpc-interface-spec/
- type: GettingStarted
  url: https://wiki.polkadot.com/kusama/kusama-getting-started/
- type: Support
  url: https://docs.polkadot.com/get-support/
- type: Community
  url: https://forum.polkadot.network/tag/kusama
- type: GitHubOrganization
  url: https://github.com/paritytech
- type: TermsOfService
  url: https://kusama.network/terms
- type: PrivacyPolicy
  url: https://kusama.network/privacy
- type: Packages
  url: packages/kusama-packages.yml
- type: SDKs
  url: packages/kusama-packages.yml
- type: CLI
  url: cli/kusama-cli.yml
- type: X-MCPServerCandidate
  url: mcp/kusama-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/kusama-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: WellKnown
  url: well-known/kusama-well-known.yml
- type: Authentication
  url: authentication/kusama-authentication.yml
- type: Conventions
  url: conventions/kusama-conventions.yml
- type: Idempotency
  url: conventions/kusama-conventions.yml
- type: Conformance
  url: conformance/kusama-conformance.yml
- type: Lifecycle
  url: lifecycle/kusama-lifecycle.yml
- type: Deprecation
  url: lifecycle/kusama-lifecycle.yml
- type: ChangeLog
  url: changelog/kusama-changelog.yml
- type: Sandbox
  url: sandbox/kusama-sandbox.yml
- type: DomainSecurity
  url: security/kusama-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/kusama-vulnerability-disclosure.yml
- type: Security
  url: security/kusama-vulnerability-disclosure.yml
- type: Webhooks
  url: asyncapi/kusama-jsonrpc-asyncapi.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Kusama API — frequently asked questions

Does Kusama have an API?

Yes. APIs.io lists 21 APIs from Kusama, including Kusama JSON-RPC API, Kusama Accounts API and Kusama Ahm API, and 18 more.

Is there an OpenAPI specification for the Kusama API?

Yes. APIs.io indexes 20 OpenAPI specifications for Kusama, each linked for download from this page.

How do I authenticate with the Kusama API?

Kusama uses bearer-token authentication (0 schemes). The details are profiled on APIs.io as Kusama Authentication.

Is the Kusama API ready for AI agents?

Kusama has a Kin Score of 50.2 out of 100 (developing) and an Agent Readiness score of 26.1 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

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find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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