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.

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

🌐 Visit website 📡 Source on GitHub
24.2/100 emerging ▬ flat Agent 25/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0
1 published contract
Developer ToolsPackage RegistrynpmPyPIVersionsSoftware Supply ChainDependency Managementopen-source metadata

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0
Composite quality — 24.2/100 · emerging
Contract Quality 8.2 / 21
Developer Ergonomics 3.9 / 17
Access Clarity 3.6 / 17
Operational Transparency 0.0 / 11
Contract Governance 0.0 / 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
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/.
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 github.com/api-evangelist/version-signal-api: open an issue to ask a question, or submit a pull request to add artifacts. 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.

Version Signal Version API

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

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

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

UNRECORDED

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
ErrorCatalog
 Conventions
Conventions
 Lifecycle
Lifecycle
 Conformance
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)

apis.yml Raw ↑ 
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
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

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