Cubist

Cubist builds hardware-backed key management and embedded wallet infrastructure for Web3. Its flagship product, CubeSigner, generates and seals cryptographic keys inside FIPS 140 HSMs running in AWS Nitro Enclaves and enforces transaction approvals with a programmable Policy-as-Code engine. The CubeSigner REST API spans organizations, users, roles, keys, policies, contacts, sessions, and multi-factor approvals, plus multi-chain signing for EVM (Ethereum, Avalanche), Bitcoin/Taproot, Solana, Sui, Tendermint, Ethereum validators (eth2), and Babylon Bitcoin staking. Authentication is a two-stage OIDC-to-session-token exchange with least-privilege scopes and step-up MFA. Cubist is backed by Amplify Partners and Polychain and is SOC 2 compliant.

Cubist publishes 30 APIs on the APIs.io network, including Account API, Accounts API, Audit API, and 27 more. Tagged areas include Company, Developer Tools, Key Management, Wallets, and Digital Signatures.

Cubist’s developer surface includes documentation, engineering blog, support, authentication, sandbox, CLI, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub

44.3/100 thin ▬ flat Agent 65/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5

30 APIs 1 MCP Servers

CompanyDeveloper ToolsKey ManagementWalletsDigital SignaturesSecurityBlockchainWeb3Custody

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 44.3/100 · thin

Contract Quality 12.8 / 25

Developer Ergonomics 12.2 / 20

Commercial Clarity 7.4 / 20

Operational Transparency 2.1 / 13

Governance 0.0 / 12

Discoverability 10.0 / 10

Agent readiness — 65/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 15 / 15

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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/cubist: 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 30

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

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Scopes 1

OAuth scopes governing access to this provider's APIs.

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Sandbox

Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer

AgentSkill

AgentSkill

LLMsTxt

AgenticAccess

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

DataModel

Lifecycle

Conformance

Components

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

CLI

Packages

SDKs

Access & Security 7

Authentication, authorization, and security posture

Security

Compliance

TrustCenter

Authentication

OAuthScopes

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Scroll for all 7

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: cubist
name: Cubist
description: Cubist builds hardware-backed key management and embedded wallet infrastructure for Web3. Its flagship product,
  CubeSigner, generates and seals cryptographic keys inside FIPS 140 HSMs running in AWS Nitro Enclaves and enforces transaction
  approvals with a programmable Policy-as-Code engine. The CubeSigner REST API spans organizations, users, roles, keys, policies,
  contacts, sessions, and multi-factor approvals, plus multi-chain signing for EVM (Ethereum, Avalanche), Bitcoin/Taproot,
  Solana, Sui, Tendermint, Ethereum validators (eth2), and Babylon Bitcoin staking. Authentication is a two-stage OIDC-to-session-token
  exchange with least-privilege scopes and step-up MFA. Cubist is backed by Amplify Partners and Polychain and is SOC 2 compliant.
url: https://raw.githubusercontent.com/api-evangelist/cubist/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://cdn.prod.website-files.com/638a2693daaf8527290065a3/684c2782072fa5039c3846f0_Opengraph%20-%20Home.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- amplify-partners
- polychain
x-tier: enriched
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Developer Tools
- Key Management
- Wallets
- Digital Signatures
- Security
- Blockchain
- Web3
- Custody
apis:
- aid: cubist:cubist-account-api
  name: Cubist Account API
  description: The Account API from Cubist — 1 operation(s) for account.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/cubist-account-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-accounts-api
  name: Cubist Accounts API
  description: The Accounts API from Cubist — 1 operation(s) for accounts.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/cubist-accounts-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-audit-api
  name: Cubist Audit API
  description: The Audit API from Cubist — 1 operation(s) for audit.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Audit
  properties:
  - type: OpenAPI
    url: openapi/cubist-audit-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-authmigration-api
  name: Cubist AuthMigration API
  description: The AuthMigration API from Cubist — 3 operation(s) for authmigration.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - AuthMigration
  properties:
  - type: OpenAPI
    url: openapi/cubist-authmigration-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-babylon-api
  name: Cubist Babylon API
  description: The Babylon API from Cubist — 2 operation(s) for babylon.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Babylon
  properties:
  - type: OpenAPI
    url: openapi/cubist-babylon-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-contact-api
  name: Cubist Contact API
  description: The Contact API from Cubist — 3 operation(s) for contact.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Contact
  properties:
  - type: OpenAPI
    url: openapi/cubist-contact-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-cube3signer-api
  name: Cubist Cube3Signer API
  description: The Cube3Signer API from Cubist — 1 operation(s) for cube3signer.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Cube3Signer
  properties:
  - type: OpenAPI
    url: openapi/cubist-cube3signer-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-identity-api
  name: Cubist Identity API
  description: The Identity API from Cubist — 4 operation(s) for identity.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Identity
  properties:
  - type: OpenAPI
    url: openapi/cubist-identity-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-internal-api
  name: Cubist Internal API
  description: The Internal API from Cubist — 4 operation(s) for internal.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Internal
  properties:
  - type: OpenAPI
    url: openapi/cubist-internal-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-keys-api
  name: Cubist Keys API
  description: The Keys API from Cubist — 10 operation(s) for keys.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Keys
  properties:
  - type: OpenAPI
    url: openapi/cubist-keys-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-keys-in-role-api
  name: Cubist Keys In Role API
  description: The Keys In Role API from Cubist — 2 operation(s) for keys in role.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Keys In Role
  properties:
  - type: OpenAPI
    url: openapi/cubist-keys-in-role-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-login-api
  name: Cubist Login API
  description: The Login API from Cubist — 2 operation(s) for login.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Login
  properties:
  - type: OpenAPI
    url: openapi/cubist-login-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-metrics-api
  name: Cubist Metrics API
  description: The Metrics API from Cubist — 2 operation(s) for metrics.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Metrics
  properties:
  - type: OpenAPI
    url: openapi/cubist-metrics-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-mfa-api
  name: Cubist MFA API
  description: The MFA API from Cubist — 5 operation(s) for mfa.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - MFA
  properties:
  - type: OpenAPI
    url: openapi/cubist-mfa-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-misc-api
  name: Cubist Misc API
  description: The Misc API from Cubist — 1 operation(s) for misc.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Misc
  properties:
  - type: OpenAPI
    url: openapi/cubist-misc-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-mmi-api
  name: Cubist MMI API
  description: The MMI API from Cubist — 6 operation(s) for mmi.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - MMI
  properties:
  - type: OpenAPI
    url: openapi/cubist-mmi-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-oauth2-api
  name: Cubist OAuth2 API
  description: The OAuth2 API from Cubist — 7 operation(s) for oauth2.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - OAuth2
  properties:
  - type: OpenAPI
    url: openapi/cubist-oauth2-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-org-api
  name: Cubist Org API
  description: The Org API from Cubist — 1 operation(s) for org.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Org
  properties:
  - type: OpenAPI
    url: openapi/cubist-org-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-orgs-api
  name: Cubist Orgs API
  description: The Orgs API from Cubist — 4 operation(s) for orgs.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Orgs
  properties:
  - type: OpenAPI
    url: openapi/cubist-orgs-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-policies-api
  name: Cubist Policies API
  description: The Policies API from Cubist — 11 operation(s) for policies.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Policies
  properties:
  - type: OpenAPI
    url: openapi/cubist-policies-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-role-access-tokens-api
  name: Cubist Role Access Tokens API
  description: The Role Access Tokens API from Cubist — 2 operation(s) for role access tokens.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Role Access Tokens
  properties:
  - type: OpenAPI
    url: openapi/cubist-role-access-tokens-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-roles-api
  name: Cubist Roles API
  description: The Roles API from Cubist — 7 operation(s) for roles.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Roles
  properties:
  - type: OpenAPI
    url: openapi/cubist-roles-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-rpc-api
  name: Cubist RPC API
  description: The RPC API from Cubist — 1 operation(s) for rpc.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - RPC
  properties:
  - type: OpenAPI
    url: openapi/cubist-rpc-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-sessions-api
  name: Cubist Sessions API
  description: The Sessions API from Cubist — 3 operation(s) for sessions.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Sessions
  properties:
  - type: OpenAPI
    url: openapi/cubist-sessions-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-signersession-api
  name: Cubist SignerSession API
  description: The SignerSession API from Cubist — 1 operation(s) for signersession.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - SignerSession
  properties:
  - type: OpenAPI
    url: openapi/cubist-signersession-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-signing-api
  name: Cubist Signing API
  description: The Signing API from Cubist — 21 operation(s) for signing.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Signing
  properties:
  - type: OpenAPI
    url: openapi/cubist-signing-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-user-api
  name: Cubist User API
  description: The User API from Cubist — 11 operation(s) for user.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/cubist-user-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-user-export-api
  name: Cubist User Export API
  description: The User Export API from Cubist — 1 operation(s) for user export.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - User Export
  properties:
  - type: OpenAPI
    url: openapi/cubist-user-export-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-users-in-org-api
  name: Cubist Users In Org API
  description: The Users In Org API from Cubist — 9 operation(s) for users in org.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Users In Org
  properties:
  - type: OpenAPI
    url: openapi/cubist-users-in-org-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
- aid: cubist:cubist-users-in-role-api
  name: Cubist Users In Role API
  description: The Users In Role API from Cubist — 2 operation(s) for users in role.
  humanURL: https://cubist.dev/product-suite
  baseURL: https://prod.signer.cubist.dev
  tags:
  - Users In Role
  properties:
  - type: OpenAPI
    url: openapi/cubist-users-in-role-api-openapi.yml
  - type: Documentation
    url: https://cubist.dev/product-suite
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://cubist.dev
- type: Documentation
  url: https://cubist.dev/product-suite
- type: Blog
  url: https://cubist.dev/blog
- type: Support
  url: https://cubist.dev/contact
- type: GitHubOrganization
  url: https://github.com/cubist-labs
- type: TermsOfService
  url: https://cubist.dev/legal/terms-and-conditions
- type: PrivacyPolicy
  url: https://cubist.dev/legal/privacy-policy
- type: Security
  url: https://cubist.dev/legal/responsible-disclosure
- type: Compliance
  url: https://cubist.dev/product-security
- type: TrustCenter
  url: https://cubist.dev/information-security
- type: Authentication
  url: authentication/cubist-authentication.yml
- type: OAuthScopes
  url: scopes/cubist-scopes.yml
- type: Conventions
  url: conventions/cubist-conventions.yml
- type: ErrorCatalog
  url: errors/cubist-error-codes.yml
- type: DataModel
  url: data-model/cubist-data-model.yml
- type: Lifecycle
  url: lifecycle/cubist-lifecycle.yml
- type: Conformance
  url: conformance/cubist-conformance.yml
- type: Sandbox
  url: sandbox/cubist-sandbox.yml
- type: CLI
  url: cli/cubist-cli.yml
- type: Components
  url: components/cubist-components.yml
- type: Packages
  url: packages/cubist-packages.yml
- type: SDKs
  url: packages/cubist-packages.yml
- type: MCPServer
  url: mcp/cubist-mcp.yml
- type: AgentSkill
  url: skills/cubist-create-key-and-sign-evm.md
- type: AgentSkill
  url: skills/cubist-scoped-role-with-policy.md
- type: LLMsTxt
  url: llms/cubist-llms.txt
- type: AgenticAccess
  url: agentic-access/cubist-agentic-access.yml
- type: DomainSecurity
  url: security/cubist-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/cubist-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence