Hubble Protocol

Hubble Protocol is a Solana-based decentralized finance (DeFi) protocol that lets users borrow the USDH stablecoin against multiple crypto collateral assets (SOL, mSOL, stSOL, ETH, BTC and more) with interest-free, fixed-fee loans held open for unlimited time. The protocol pairs a Stability Vault, a Peg Stability Module, a hybrid liquidation model, and native yield on deposited collateral. Developers integrate with Hubble on-chain through its Anchor programs (IDLs published on GitHub) and the open-source "@hubbleprotocol/hubble-sdk" TypeScript client, which exposes borrowing market states, HBB staking and USDH stability-pool data, user loans, treasury and circulating-supply metrics, and peg-stability swaps. Hubble published security audits (Arcadia, Kudelski, Smart State, Sec3) and runs a funded bug-bounty program; its core contributors later built Kamino Finance.

Hubble Protocol is profiled on the APIs.io network. Tagged areas include Company, Web3, DeFi, Solana, and Stablecoins.

Hubble Protocol’s developer surface includes engineering blog, documentation, getting-started guide, API reference, support, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

16.3/100 emerging ▬ flat Agent 0/100 human only Heartbeat 34/100 slowing library Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Web3 DeFi Solana Stablecoins Lending Borrowing Blockchain SDK Cryptocurrency

Kin Score

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

Composite quality — 16.3/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 8.1 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.5 / 11

Contract Governance 0.0 / 10

Discoverability 4.7 / 9

Regulatory Posture 1.8 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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

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 5 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Contract Governance scores 0.0 — up to +12.0 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/hubble-protocol/apis.yml: open an issue on github.com/api-evangelist/hubble-protocol 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Stablecoins and Tokenization (stablecoin issuers, tokenized assets)	covered	26.8 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Security Posture 2

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

Hubble Protocol Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Hubble Protocol Vulnerability Disclosure

contact published

SECURITY

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

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 2

The organization behind the API

Blog

Blog

Website

Website

Source (apis.yml)

aid: hubble-protocol
name: Hubble Protocol
description: Hubble Protocol is a Solana-based decentralized finance (DeFi) protocol that lets users borrow the USDH stablecoin
  against multiple crypto collateral assets (SOL, mSOL, stSOL, ETH, BTC and more) with interest-free, fixed-fee loans held
  open for unlimited time. The protocol pairs a Stability Vault, a Peg Stability Module, a hybrid liquidation model, and native
  yield on deposited collateral. Developers integrate with Hubble on-chain through its Anchor programs (IDLs published on
  GitHub) and the open-source "@hubbleprotocol/hubble-sdk" TypeScript client, which exposes borrowing market states, HBB staking
  and USDH stability-pool data, user loans, treasury and circulating-supply metrics, and peg-stability swaps. Hubble published
  security audits (Arcadia, Kudelski, Smart State, Sec3) and runs a funded bug-bounty program; its core contributors later
  built Kamino Finance.
url: https://raw.githubusercontent.com/api-evangelist/hubble-protocol/refs/heads/main/apis.yml
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://app.hubbleprotocol.io/Hubble-URL-Banner.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- multicoin-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
x-docs-platform: gitbook
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-03
tags:
- Company
- Web3
- DeFi
- Solana
- Stablecoins
- Lending
- Borrowing
- Blockchain
- SDK
- Cryptocurrency
tags_raw:
- Company
- Crypto Web3
- DeFi
- Solana
- Stablecoin
- Lending
- Borrowing
- Blockchain
- SDK
- Web3
- Cryptocurrency
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://app.hubbleprotocol.io/blog/
  type: Blog
- type: DomainSecurity
  url: security/hubble-protocol-domain-security.yml
- type: Website
  url: https://hubbleprotocol.io
- type: DeveloperPortal
  url: https://docs.hubbleprotocol.io
- type: Documentation
  url: https://docs.hubbleprotocol.io
- type: GettingStarted
  url: https://docs.hubbleprotocol.io/overview
- type: APIReference
  url: https://github.com/hubbleprotocol/hubble-common/blob/master/packages/hubble-sdk/README.md
- type: GitHubOrganization
  url: https://github.com/hubbleprotocol
- type: Support
  url: https://discord.gg/b4XqQbbSBk
- type: Packages
  url: packages/hubble-protocol-packages.yml
- type: SDKs
  url: packages/hubble-protocol-packages.yml
- type: LLMsTxt
  url: llms/hubble-protocol-llms.txt
- type: VulnerabilityDisclosure
  url: security/hubble-protocol-vulnerability-disclosure.yml
- type: Security
  url: security/hubble-protocol-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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