vlt

vlt (pronounced "volt") is a JavaScript package management company started by the creator of npm and former members of the npm core team, and backed by Accel. It ships the open source vlt package manager CLI, the npm-compatible vlt serverless registry (vsr) that runs on Cloudflare's edge network, and a hosted registry platform at vlt.io with user, token, and access management exposed through an npm-compatible registry API at registry.vlt.io.

vlt is listed with 1 API on the APIs.io network. Tagged areas include Company, JavaScript, Package Management, Package Registry, and Developer Tools.

vlt’s developer surface includes CLI, changelog, authentication, documentation, getting-started guide, engineering blog, pricing, and 26 more developer resources.

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49.7/100 developing ▬ flat Agent 3/100 human only Front door AI 2/6 trace Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 API

Company JavaScript Package Management Package Registry Developer Tools CLI Serverless npm Dependency Management Open Source

Kin Score

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

Composite quality — 49.7/100 · developing

Contract Quality 0.0 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 15.7 / 17

Operational Transparency 5.5 / 11

Contract Governance 1.9 / 10

Discoverability 5.7 / 9

Regulatory Posture 5.3 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

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
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

12 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
Contract Governance scores 18.2 — up to +9.8 composite points
Developer Ergonomics scores 64.3 — up to +7.1 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/vlt/apis.yml: open an issue on github.com/api-evangelist/vlt 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 →

APIs 1

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

vlt Serverless Registry (vsr) API

npm-compatible package registry API implemented by vsr, vlt's serverless registry. Exposes package publish/install endpoints (packuments, tarballs, dist-tags), user and token ma...

vlt API pricing

Prices published by vlt. This record is due for a re-check. A free plan or tier is listed.

Plan	Price
Free	Free per user / month
Pro	$8 per user / month (billed annually)
Premium	$20 per user / month (billed annually, minimum 2 seats)
Enterprise	—

Plan details, limits and sources →

Billed by: user / month · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Vlt Plans

4 plans

PLANS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Vlt Finops

FINOPS

Security Posture 3

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

Vlt Authentication

http-bearer/oidc-exchange · 4 schemes

SECURITY

Vlt Domain Security

TLSv1.3 · HSTS

SECURITY

Vlt Vulnerability Disclosure

no policy recorded

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Conformance

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

CLI

CLI

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

Compliance

Security

Operate 5

Status, limits, changes, and where to get help

ChangeLog

StatusPage

Support

Community

Roadmap

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 7

The organization behind the API

BlogRSS

Website

Blog

BlogRSS

About

Careers

Press

Scroll for all 7

Other 1

Properties that don't map to a standard resource type

Benchmarks

Benchmarks

Source (apis.yml)

aid: vlt
name: vlt
description: vlt (pronounced "volt") is a JavaScript package management company started by the creator of npm and former members
  of the npm core team, and backed by Accel. It ships the open source vlt package manager CLI, the npm-compatible vlt serverless
  registry (vsr) that runs on Cloudflare's edge network, and a hosted registry platform at vlt.io with user, token, and access
  management exposed through an npm-compatible registry API at registry.vlt.io.
url: https://raw.githubusercontent.com/api-evangelist/vlt/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://github.com/vltpkg.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
x-tier: full
x-tier-reason: enriched-from-portfolio-lead
specificationVersion: '0.23'
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 11
  pass: local-v1
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- JavaScript
- Package Management
- Package Registry
- Developer Tools
- CLI
- Serverless
- npm
- Dependency Management
- Open Source
tags_raw:
- Company
- JavaScript
- Package Management
- Package Registry
- Developer Tools
- CLI
- Serverless
- npm
- Dependency Management
- Open Source
- Open-Source
apis:
- aid: vlt:vlt-serverless-registry-api
  name: vlt Serverless Registry (vsr) API
  description: npm-compatible package registry API implemented by vsr, vlt's serverless registry. Exposes package publish/install
    endpoints (packuments, tarballs, dist-tags), user and token management, granular access control, search, audit, and ping
    routes. The hosted platform instance at registry.vlt.io is authentication-gated; self-hosted vsr instances serve their
    own OpenAPI document at /-/api and an interactive API reference at /-/docs.
  baseURL: https://registry.vlt.io
  humanURL: https://github.com/vltpkg/vsr
  tags:
  - Packages
  - Registry
  - Tokens
  - Access
  properties:
  - url: https://github.com/vltpkg/vsr
    type: Documentation
  - url: https://docs.vlt.io/cli/registries
    type: DeveloperPortal
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.vlt.io/rss.xml
  type: BlogRSS
- type: VulnerabilityDisclosure
  url: security/vlt-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/vlt-domain-security.yml
- type: Packages
  url: packages/vlt-packages.yml
- type: SDKs
  url: packages/vlt-packages.yml
- type: LLMsTxt
  url: llms/vlt-llms.txt
- type: CLI
  url: cli/vlt-cli.yml
- type: ChangeLog
  url: changelog/vlt-changelog.yml
- type: Lifecycle
  url: lifecycle/vlt-lifecycle.yml
- type: Authentication
  url: authentication/vlt-authentication.yml
- type: Conformance
  url: conformance/vlt-conformance.yml
- type: Compliance
  url: https://www.vlt.io/security
- type: Plans
  url: plans/vlt-plans.yml
- type: Website
  url: https://www.vlt.io/
- type: Documentation
  url: https://docs.vlt.io/
- type: GettingStarted
  url: https://docs.vlt.io/cli
- type: Blog
  url: https://www.vlt.io/blog
- type: BlogRSS
  url: https://www.vlt.io/blog/rss.xml
- type: Pricing
  url: https://www.vlt.io/pricing
- type: SignUp
  url: https://www.vlt.io/sign-up
- type: Login
  url: https://www.vlt.io/sign-in
- type: TermsOfService
  url: https://www.vlt.io/terms
- type: PrivacyPolicy
  url: https://www.vlt.io/privacy
- type: Security
  url: https://www.vlt.io/security
- type: StatusPage
  url: https://status.vlt.io/
- type: GitHubOrganization
  url: https://github.com/vltpkg
- type: Support
  url: https://www.vlt.io/contact
- type: Community
  url: https://discord.gg/qdbXTqxZzZ
- type: Roadmap
  url: https://github.com/vltpkg/vsr/blob/main/info/ROADMAP.md
- type: About
  url: https://www.vlt.io/about
- type: Careers
  url: https://www.vlt.io/careers
- type: Press
  url: https://www.vlt.io/press
- type: Benchmarks
  url: https://benchmarks.vlt.sh/

vlt API — frequently asked questions

Does vlt have an API?

Yes. APIs.io lists 1 API from vlt, including vlt Serverless Registry (vsr) API.

How do I authenticate with the vlt API?

vlt uses bearer-token authentication (http-bearer/oidc-exchange · 4 schemes). The details are profiled on APIs.io as Vlt Authentication.

How much does the vlt API cost?

APIs.io lists 4 pricing plans for vlt, with each plan's price, limits and inclusions under Pricing on this page.

Is the vlt API ready for AI agents?

vlt has a Kin Score of 49.7 out of 100 (developing) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-06.

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