HashKey Cloud (HashQuark)

HashKey Cloud, formerly HashQuark, is a Hong Kong-based blockchain infrastructure and Web3 staking provider (part of HashKey Group) that runs enterprise-grade validator nodes across 50+ mainstream proof-of-stake public chains including Ethereum, Cosmos, Solana, Polkadot, Avalanche, Sui and BNB Chain. It exposes a developer platform for institutional staking: a Staking API to onboard users, generate deposits, assign and exit validators and drive pooled staking; a Data API to track node status and daily/monthly/quarterly/ annual reward data; plus a dashboard, a Babylon BTC staking flow and a first-party Go SDK. Requests are authenticated with a custom Quark-Keccak256-ECDSA request-signing scheme keyed to an Ethereum keypair. Originally added to the API Evangelist network as a portfolio-lead stub (surfaced via Qiming), now enriched from HashKey Cloud's public developer surface.

HashKey Cloud (HashQuark) publishes 2 APIs on the APIs.io network. Tagged areas include Company, Blockchain, Staking, Web3, and Validators.

HashKey Cloud (HashQuark)’s developer surface includes documentation, API reference, getting-started guide, engineering blog, authentication, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub
22.9/100 emerging Agent 10/100 human only Full breakdown ↓
scored 2026-07-20 · rubric v0.4
2 APIs 0 Features
CompanyBlockchainStakingWeb3ValidatorsCryptocurrencyNode InfrastructureProof of StakeEthereumDeFi

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 22.9/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 10.9 / 20
Commercial Clarity 2.1 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 10/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/hashquark: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

HashKey Cloud Staking API

Institutional staking API to onboard broker users, generate and track deposits, assign/exit validators, drive pooled staking and Babylon BTC staking across supported proof-of-st...

HashKey Cloud Data API

Reporting API for node status and staking reward data (daily, monthly, quarterly and annual rewards) for integrated staking users. Shares the Quark-Keccak256-ECDSA authenticatio...

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Conformance
Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

X
X

Source (apis.yml)

apis.yml Raw ↑ 
aid: hashquark
name: HashKey Cloud (HashQuark)
description: 'HashKey Cloud, formerly HashQuark, is a Hong Kong-based blockchain infrastructure and Web3 staking provider
  (part of HashKey Group) that runs enterprise-grade validator nodes across 50+ mainstream proof-of-stake public chains including
  Ethereum, Cosmos, Solana, Polkadot, Avalanche, Sui and BNB Chain. It exposes a developer platform for institutional staking:
  a Staking API to onboard users, generate deposits, assign and exit validators and drive pooled staking; a Data API to track
  node status and daily/monthly/quarterly/ annual reward data; plus a dashboard, a Babylon BTC staking flow and a first-party
  Go SDK. Requests are authenticated with a custom Quark-Keccak256-ECDSA request-signing scheme keyed to an Ethereum keypair.
  Originally added to the API Evangelist network as a portfolio-lead stub (surfaced via Qiming), now enriched from HashKey
  Cloud''s public developer surface.'
url: https://raw.githubusercontent.com/api-evangelist/hashquark/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- qiming
x-tier: enriched
x-tier-reason: real-developer-surface
x-rebrand: HashQuark is now HashKey Cloud (hashquark.io redirects to www.hashkey.cloud)
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
image: https://avatars.githubusercontent.com/u/138440702?v=4
tags:
- Company
- Blockchain
- Staking
- Web3
- Validators
- Cryptocurrency
- Node Infrastructure
- Proof of Stake
- Ethereum
- DeFi
apis:
- name: HashKey Cloud Staking API
  description: Institutional staking API to onboard broker users, generate and track deposits, assign/exit validators, drive
    pooled staking and Babylon BTC staking across supported proof-of-stake protocols. Authenticated with the Quark-Keccak256-ECDSA
    request-signature scheme.
  humanURL: https://hashkeycloud.gitbook.io/docs/api/staking-api/get-started
  baseURL: https://staking.hashkey.cloud
  tags:
  - Staking
  - Validators
  - Blockchain
  properties:
  - type: Documentation
    url: https://hashkeycloud.gitbook.io/docs/api/staking-api
  - type: GettingStarted
    url: https://hashkeycloud.gitbook.io/docs/api/staking-api/get-started
- name: HashKey Cloud Data API
  description: Reporting API for node status and staking reward data (daily, monthly, quarterly and annual rewards) for integrated
    staking users. Shares the Quark-Keccak256-ECDSA authentication and the {code,msg,data} response envelope.
  humanURL: https://hashkeycloud.gitbook.io/docs/api/data-api/get-started
  baseURL: https://staking.hashkey.cloud
  tags:
  - Data
  - Rewards
  - Reporting
  properties:
  - type: Documentation
    url: https://hashkeycloud.gitbook.io/docs/api/data-api
  - type: APIReference
    url: https://hashkeycloud.gitbook.io/docs/api/data-api/api-specs
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/hashquark-domain-security.yml
- type: Website
  url: https://www.hashkey.cloud
- type: DeveloperPortal
  url: https://hashkeycloud.gitbook.io/docs
- type: Documentation
  url: https://hashkeycloud.gitbook.io/docs
- type: APIReference
  url: https://hashkeycloud.gitbook.io/docs/api/data-api/api-specs
- type: GettingStarted
  url: https://hashkeycloud.gitbook.io/docs/api/staking-api/get-started
- type: Blog
  url: https://hashkeycloud.medium.com/
- type: GitHubOrganization
  url: https://github.com/hashquark-staking
- type: PrivacyPolicy
  url: https://group.hashkey.com/en/privacy-policy
- type: X
  url: https://twitter.com/HashKeyCloud
- type: Authentication
  url: authentication/hashquark-authentication.yml
- type: Conventions
  url: conventions/hashquark-conventions.yml
- type: Conformance
  url: conformance/hashquark-conformance.yml
- type: Packages
  url: packages/hashquark-packages.yml
- type: SDKs
  url: packages/hashquark-packages.yml
- type: LLMsTxt
  url: llms/hashquark-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence