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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Cubist the way a machine reads it — 36 machine-readable artifacts across 30 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Cubist scores 44.3/100 (thin), with a separate agent-readiness read of 65/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Cubist
Each block below is one kind of artifact we hold for Cubist. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 30
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Cubist Account API
The Account API from Cubist — 1 operation(s) for account.
Cubist Accounts API
The Accounts API from Cubist — 1 operation(s) for accounts.
Cubist Audit API
The Audit API from Cubist — 1 operation(s) for audit.
Cubist AuthMigration API
The AuthMigration API from Cubist — 3 operation(s) for authmigration.
Cubist Babylon API
The Babylon API from Cubist — 2 operation(s) for babylon.
Cubist Contact API
The Contact API from Cubist — 3 operation(s) for contact.
Cubist Cube3Signer API
The Cube3Signer API from Cubist — 1 operation(s) for cube3signer.
Cubist Identity API
The Identity API from Cubist — 4 operation(s) for identity.
Cubist Internal API
The Internal API from Cubist — 4 operation(s) for internal.
Cubist Keys API
The Keys API from Cubist — 10 operation(s) for keys.
Cubist Keys In Role API
The Keys In Role API from Cubist — 2 operation(s) for keys in role.
Cubist Login API
The Login API from Cubist — 2 operation(s) for login.
Cubist Metrics API
The Metrics API from Cubist — 2 operation(s) for metrics.
Cubist MFA API
The MFA API from Cubist — 5 operation(s) for mfa.
Cubist Misc API
The Misc API from Cubist — 1 operation(s) for misc.
Cubist MMI API
The MMI API from Cubist — 6 operation(s) for mmi.
Cubist OAuth2 API
The OAuth2 API from Cubist — 7 operation(s) for oauth2.
Cubist Org API
The Org API from Cubist — 1 operation(s) for org.
Cubist Orgs API
The Orgs API from Cubist — 4 operation(s) for orgs.
Cubist Policies API
The Policies API from Cubist — 11 operation(s) for policies.
Cubist Role Access Tokens API
The Role Access Tokens API from Cubist — 2 operation(s) for role access tokens.
Cubist Roles API
The Roles API from Cubist — 7 operation(s) for roles.
Cubist RPC API
The RPC API from Cubist — 1 operation(s) for rpc.
Cubist Sessions API
The Sessions API from Cubist — 3 operation(s) for sessions.
Cubist SignerSession API
The SignerSession API from Cubist — 1 operation(s) for signersession.
Cubist Signing API
The Signing API from Cubist — 21 operation(s) for signing.
Cubist User API
The User API from Cubist — 11 operation(s) for user.
Cubist User Export API
The User Export API from Cubist — 1 operation(s) for user export.
Cubist Users In Org API
The Users In Org API from Cubist — 9 operation(s) for users in org.
Cubist Users In Role API
The Users In Role API from Cubist — 2 operation(s) for users in role.
Scroll within the panel for all 30 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
cubist-mcp.yml
MCP SERVERSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Cubist — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 7
Authentication, authorization, and security posture
Scroll within the panel for all 7 ·
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
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