Version Signal

Returns the current stable version and publication date of any npm or PyPI package, sourced from the canonical registry. A free, no-signup lookup tool with a browser UI and a machine-readable API, hosted on a Cloudflare Worker.

Version Signal publishes 1 API contract indexed on the APIs.io network: Version API. Tagged areas include Developer Tools, Package Registry, npm, PyPI, and Versions.

The Version Signal catalog on APIs.io includes 1 Spectral governance ruleset.

Version Signal’s developer surface includes documentation, authentication, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.9/100 emerging ▬ flat Agent 25/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFree

1 published contract 1 Agent Skills

Developer Tools Package Registry npm PyPI Versions Software Supply Chain Dependency Managementopen-source metadata

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 25.9/100 · emerging

Contract Quality 8.2 / 21

Developer Ergonomics 3.9 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.4 / 10

Discoverability 4.7 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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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It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/version-signal-api/"><img src="https://apis.io/badge/version-signal-api/card.svg" alt="Version Signal on APIs.io — Kin Score by API Evangelist"></a>

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Agent readiness — checks not met, largest first (exact, from this profile):

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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

5 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 21.1 — up to +15.8 composite points
Developer Ergonomics scores 23.2 — up to +15.4 composite points
Contract Quality scores 38.6 — up to +15.4 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/version-signal-api/apis.yml: open an issue on github.com/api-evangelist/version-signal-api 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 →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 1

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

Version Signal Version API

The Version API from Version Signal — 1 operation(s) for version.

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

check-package-version

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Version Signal Api Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Version Signal Api Rate Limits

0 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Version Signal API Rules

27 rules · 25 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Version Signal Api Openapi Overlay

2 actions · documentation · version-signal-api-openapi.json

DERIVED

Security Posture 2

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

Version Signal Api Authentication

none · 0 schemes

SECURITY

Version Signal Api Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

AgentSkill

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

Lifecycle

Conformance

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 1

Pricing, plans, and the legal terms of use

Plans

Plans

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

name: Version Signal
description: Returns the current stable version and publication date of any npm or PyPI package, sourced from the canonical
  registry. A free, no-signup lookup tool with a browser UI and a machine-readable API, hosted on a Cloudflare Worker.
url: https://raw.githubusercontent.com/api-evangelist/version-signal-api/refs/heads/main/apis.yml
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-02'
  method: derived
created: '2026-09-20'
modified: '2026-09-20'
specificationVersion: '0.21'
tags:
- Developer Tools
- Package Registry
- npm
- PyPI
- Versions
- Software Supply Chain
- Dependency Management
- open-source metadata
tags_raw:
- developer tools
- package registry
- npm
- pypi
- versions
- software supply chain
- dependency management
- open-source metadata
apis:
- aid: version-signal-api:version-signal-api-version-api
  name: Version Signal Version API
  description: The Version API from Version Signal — 1 operation(s) for version.
  humanURL: https://version-signal.inboxtzdjqv.workers.dev/
  tags:
  - Version
  properties:
  - type: OpenAPI
    url: openapi/version-signal-api-version-api-openapi.yml
  - type: LLMsTxt
    url: llms/version-signal-api-llms.txt
  - type: LLMsTxt
    url: https://version-signal.inboxtzdjqv.workers.dev/llms.txt
  - type: Documentation
    url: https://version-signal.inboxtzdjqv.workers.dev/
maintainers:
- FN: Version Signal
  url: https://version-signal.inboxtzdjqv.workers.dev/
x-generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 88
  at: '2026-09-20T13:31:04.867Z'
common:
- type: Overlay
  url: overlays/version-signal-api-openapi-overlay.yaml
- type: Website
  url: https://version-signal.inboxtzdjqv.workers.dev/
- type: Documentation
  url: https://version-signal.inboxtzdjqv.workers.dev/
- type: DomainSecurity
  url: security/version-signal-api-domain-security.yml
- type: Authentication
  url: authentication/version-signal-api-authentication.yml
- type: WellKnown
  url: well-known/version-signal-api-well-known.yml
- type: AgentSkill
  url: skills/_index.yml
- type: ErrorCatalog
  url: errors/version-signal-api-problem-types.yml
- type: Conventions
  url: conventions/version-signal-api-conventions.yml
- type: Lifecycle
  url: lifecycle/version-signal-api-lifecycle.yml
- type: Conformance
  url: conformance/version-signal-api-conformance.yml
- type: Plans
  url: plans/version-signal-api-plans-pricing.yml
- type: RateLimits
  url: rate-limits/version-signal-api-rate-limits.yml
x-enrichment:
  date: '2026-09-20'
  status: enriched
  artifacts_added: 17
  pass: local-v3

Version Signal API — frequently asked questions

Does Version Signal have an API?

Yes. APIs.io lists 1 API from Version Signal, including Version Signal Version API.

Is there an OpenAPI specification for the Version Signal API?

Yes. APIs.io indexes 1 OpenAPI specification for Version Signal, each linked for download from this page.

How do I authenticate with the Version Signal API?

Version Signal uses bearer-token authentication (none · 0 schemes). The details are profiled on APIs.io as Version Signal Api Authentication.

How much does the Version Signal API cost?

APIs.io lists 1 pricing plan for Version Signal, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Version Signal API ready for AI agents?

Version Signal has a Kin Score of 25.9 out of 100 (emerging) and an Agent Readiness score of 25.2 (agent-aware), scored by API Evangelist on 2026-11-02.

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