SlashYear

SlashYear provides a free, keyless API delivering a curated historical record of yearly events sourced from Wikipedia revisions. Users can query by year, date, subject, or country, and access supporting data such as world leaders, Nobel prizes, and Billboard charts. The service is open, CORS-enabled, and includes OpenAPI 3.1 documentation.

SlashYear publishes 1 API contract indexed on the APIs.io network. Tagged areas include History, Data, API, Open, and Free.

The SlashYear catalog on APIs.io includes 1 Spectral governance ruleset.

🌐 Visit website 📡 Profile data on GitHub

8.7/100 minimal Agent 4/100 human only Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers

History DataAPIOpen Free

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 8.7/100 · minimal

Contract Quality 1.3 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 4.8 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 4/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 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

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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 6.0 — up to +23.5 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 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/slashyear-com/apis.yml: open an issue on github.com/api-evangelist/slashyear-com 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.

SlashYear API

SlashYear provides a free, keyless API delivering a curated historical record of yearly events sourced from Wikipedia revisions.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

SlashYear MCP Server

Remote MCP server at slashyear.com.

MCP SERVER

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

SlashYear API Rules

11 rules · 9 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Slashyear Com Domain Security

TLSv1.3

SECURITY

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

ErrorCatalog

ErrorCatalog

Conformance

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: slashyear-com
name: SlashYear
image: https://slashyear.com/og.png
description: SlashYear provides a free, keyless API delivering a curated historical record of yearly events sourced from Wikipedia
  revisions. Users can query by year, date, subject, or country, and access supporting data such as world leaders, Nobel prizes,
  and Billboard charts. The service is open, CORS-enabled, and includes OpenAPI 3.1 documentation.
url: https://raw.githubusercontent.com/api-evangelist/slashyear-com/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-27 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-27'
modified: '2026-10-27'
tags:
- History
- Data
- API
- Open
- Free
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/slashyear-com-rules.yml
- type: ErrorCatalog
  url: errors/slashyear-com-problem-types.yml
- type: Conformance
  url: conformance/slashyear-com-conformance.yml
- type: LLMsTxt
  url: llms/slashyear-com-llms.txt
- type: MCPServer
  url: mcp/slashyear-com-mcp.yml
- type: Hosts
  url: hosts/slashyear-com-hosts.yml
- type: Vendors
  url: vendors/slashyear-com-vendors.yml
- type: DomainSecurity
  url: security/slashyear-com-domain-security.yml
- type: Website
  url: https://slashyear.com
apis:
- name: SlashYear API
  description: SlashYear provides a free, keyless API delivering a curated historical record of yearly events sourced from
    Wikipedia revisions.
  humanURL: https://slashyear.com
  aid: slashyear-com:slashyear-api
x-submission-notes: OAS 3.1, 29 ops; MCP /mcp (com.slashyear/mcp); llms.txt; keyless
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The provider's website serves HTML only and no OpenAPI, GraphQL, or other machine‑readable contract was found.
  evidence:
  - url: https://slashyear.com/openapi.json
    status: 404
  checked: '2026-10-27'
x-submitted-by: slashyearcom@gmail.com (apis.io/add, 2026-10-27)
x-enrichment:
  date: '2026-10-27'
  status: enriched
  artifacts_added: 13
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

SlashYear API — frequently asked questions

Does SlashYear have an API?

Yes. APIs.io lists 1 API from SlashYear, including SlashYear API.

Does SlashYear have an MCP server?

Yes. APIs.io lists 1 MCP server for SlashYear: Remote MCP server at slashyear.com.

Is the SlashYear API ready for AI agents?

SlashYear has a Kin Score of 8.7 out of 100 (minimal) and an Agent Readiness score of 4.2 (human-only), scored by API Evangelist on 2026-10-31.

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get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
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