Vault12

Vault12 is a non-custodial crypto asset security company whose Vault12 Guard mobile app backs up wallet seed phrases and private keys using Shamir's Secret Sharing across a decentralized network of appointed Guardians, with designated legacy contacts for crypto inheritance — no cloud storage and no custody of funds. Its developer surface is open source, centered on the Zax NaCl-based cryptographic relay (asynchronous end-to-end-encrypted device-to-device messaging and file exchange), the glow.ts client library, and native Shamir's Secret Sharing implementations, plus RFC 8414 OAuth 2.0 authorization-server metadata published on vault12.com and a public Zax test relay at zt.vault12.com.

Vault12 publishes 1 API on the APIs.io network. Tagged areas include Company, Cryptocurrency, Security, Backup, and Inheritance.

Vault12’s developer surface includes engineering blog, support, pricing, authentication, sandbox, changelog, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub
26.4/100 emerging ▬ flat Agent 14/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
1 APIs
CompanyCryptocurrencySecurityBackupInheritanceWalletsCryptographySecret SharingKey Management

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 26.4/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 6.1 / 20
Commercial Clarity 6.3 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 14/100 · 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 4 / 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/vault12: 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 1

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

Vault12 Zax Cryptographic Relay API

Open-source NaCl-based cryptographic relay operated as asynchronous "dead drops" for end-to-end-encrypted device-to-device communication. Clients establish anonymous session key...

Security Posture 2

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

Vault12 Authentication

oauth2/session-handshake · 2 schemes

SECURITY

Vault12 Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Vault12 Scopes

4 scopes · authorizationCode/implicit/password/refresh_token

4 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

Sandbox
Sandbox

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown
WellKnown
 LLMsTxt
LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 Lifecycle
Lifecycle

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
 OAuthScopes
OAuthScopes
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 ChangeLog
ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: vault12
name: Vault12
description: Vault12 is a non-custodial crypto asset security company whose Vault12 Guard mobile app backs up wallet seed
  phrases and private keys using Shamir's Secret Sharing across a decentralized network of appointed Guardians, with designated
  legacy contacts for crypto inheritance — no cloud storage and no custody of funds. Its developer surface is open source,
  centered on the Zax NaCl-based cryptographic relay (asynchronous end-to-end-encrypted device-to-device messaging and file
  exchange), the glow.ts client library, and native Shamir's Secret Sharing implementations, plus RFC 8414 OAuth 2.0 authorization-server
  metadata published on vault12.com and a public Zax test relay at zt.vault12.com.
url: https://raw.githubusercontent.com/api-evangelist/vault12/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://assets.rbl.ms/27528763/origin.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- dcvc
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 11
  pass: local-v1
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Cryptocurrency
- Security
- Backup
- Inheritance
- Wallets
- Cryptography
- Secret Sharing
- Key Management
apis:
- name: Vault12 Zax Cryptographic Relay API
  description: Open-source NaCl-based cryptographic relay operated as asynchronous "dead drops" for end-to-end-encrypted device-to-device
    communication. Clients establish anonymous session keys via a proof-of-work handshake (POST /start_session, /verify_session)
    and then post encrypted commands to /command — upload, count, download, messageStatus, delete, plus the Zax 2.0 file-command
    family (startFileUpload, uploadFileChunk, downloadFileChunk, fileStatus, deleteFile). Vault12 maintains a public test
    relay with 30-minute message expiration.
  humanURL: https://github.com/vault12/zax
  baseURL: https://zt.vault12.com
  tags:
  - Relay
  - Cryptography
  - Messaging
  - File Exchange
  properties:
  - type: Documentation
    url: https://github.com/vault12/zax
  - type: APIReference
    url: https://s3-us-west-1.amazonaws.com/vault12/crypto_relay.pdf
  - type: SourceCode
    url: https://github.com/vault12/zax
  - type: Sandbox
    url: https://zt.vault12.com
common:
- type: DomainSecurity
  url: security/vault12-domain-security.yml
- type: Website
  url: https://vault12.com
- type: Blog
  url: https://vault12.com/blog/
- type: Support
  url: https://vault12.com/help/
- type: Pricing
  url: https://vault12.com/pricing/
- type: TermsOfService
  url: https://vault12.com/terms/
- type: PrivacyPolicy
  url: https://vault12.com/privacy/
- type: StatusPage
  url: https://status.vault12.com/
- type: GitHubOrganization
  url: https://github.com/vault12
- type: Packages
  url: packages/vault12-packages.yml
- type: SDKs
  url: packages/vault12-packages.yml
- type: WellKnown
  url: well-known/vault12-well-known.yml
- type: OAuthScopes
  url: scopes/vault12-scopes.yml
- type: Authentication
  url: authentication/vault12-authentication.yml
- type: Conformance
  url: conformance/vault12-conformance.yml
- type: LLMsTxt
  url: llms/vault12-llms.txt
- type: Sandbox
  url: sandbox/vault12-sandbox.yml
- type: Lifecycle
  url: lifecycle/vault12-lifecycle.yml
- type: ChangeLog
  url: changelog/vault12-changelog.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io