4GRAND

4GRAND offers free fantasy pools for the four Grand Slam tennis tournaments. Users can join community pools or create their own, pick winners each round, and compete on leaderboards. The platform provides a social, competitive experience for tennis fans, with easy sign‑up, real‑time updates, and a vibrant community of players.

4GRAND is listed with 1 API on the APIs.io network. Tagged areas include Tennis and Grand Slam.

4GRAND’s developer surface includes documentation and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

11.2/100 emerging Agent 3/100 human only Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 API

TennisGrand Slam

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 11.2/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 4.7 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 1.2 / 15

Agent readiness — 3/100 · 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 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 Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
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) Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →

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 Ask about this →
Developer Ergonomics scores 9.5 — up to +18.1 composite points Ask about this →
Access Clarity scores 27.7 — up to +14.5 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/grand-tennis/apis.yml: open an issue on github.com/api-evangelist/grand-tennis 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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 1

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

How to Run a Tennis Pool

Guide on creating and managing a fantasy tennis pool on Grand Tennis platform.

Security Posture 1

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

4GRAND Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

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

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

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: grand-tennis
name: 4GRAND
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: unreadable
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://grand.tennis/opengraph-image-12o0cb?39aad82482f846ae
description: 4GRAND offers free fantasy pools for the four Grand Slam tennis tournaments. Users can join community pools or
  create their own, pick winners each round, and compete on leaderboards. The platform provides a social, competitive experience
  for tennis fans, with easy sign‑up, real‑time updates, and a vibrant community of players.
url: https://artifacts.apis.io/grand-tennis/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-10 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-10'
modified: '2026-11-10'
tags:
- Tennis
- Grand Slam
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: LLMsTxt
  url: llms/grand-tennis-llms.txt
- type: Hosts
  url: hosts/grand-tennis-hosts.yml
- type: Vendors
  url: vendors/grand-tennis-vendors.yml
- type: TermsOfService
  url: https://grand.tennis/terms
- type: PrivacyPolicy
  url: https://grand.tennis/privacy
- type: Login
  url: https://grand.tennis/signin
- type: Documentation
  url: https://grand.tennis/guides/how-to-run-a-tennis-pool
- type: DomainSecurity
  url: security/grand-tennis-domain-security.yml
- type: Website
  url: https://grand.tennis/
apis:
- name: How to Run a Tennis Pool
  description: Guide on creating and managing a fantasy tennis pool on Grand Tennis platform.
  humanURL: https://grand.tennis/guides/how-to-run-a-tennis-pool
  aid: grand-tennis:how-to-run-a-tennis-pool
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Provider documentation is HTML pages without any machine‑readable OpenAPI, GraphQL, AsyncAPI or other contract.
  evidence:
  - url: https://grand.tennis/guides/how-to-run-a-tennis-pool
    status: 200
  checked: '2026-11-10'
x-enrichment:
  date: '2026-11-10'
  status: enriched
  artifacts_added: 9
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

4GRAND API — frequently asked questions

Does 4GRAND have an API?

Yes. APIs.io lists 1 API from 4GRAND, including How to Run a Tennis Pool.

Is the 4GRAND API ready for AI agents?

4GRAND has a Kin Score of 11.2 out of 100 (emerging) and an Agent Readiness score of 3.1 (human-only), scored by API Evangelist on 2026-11-13.

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