Chessigma

Chessigma provides a free, no‑auth API for chess game analysis and daily puzzles. Users can submit PGN games, retrieve engine analysis, calculate rating changes, and access training puzzles without signup or rate‑limited keys. The platform runs Stockfish in the browser, offering compute‑free, unlimited analysis for Chess.com, Lichess and uploaded PGN files.

Chessigma publishes 3 API contracts indexed on the APIs.io network: Daily Puzzle API, Elo Calculator API, and Game API. Tagged areas include Company, Chess, API, Free, and NoAuth.

The Chessigma catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Chessigma’s developer surface includes documentation, engineering blog, pricing, support, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub
49.7/100 developing Agent 39/100 agent ready Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0
1 published contract
CompanyChessAPIFreeNoAuth

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0
Composite quality — 49.7/100 · developing
Contract Quality 12.8 / 21
Developer Ergonomics 5.1 / 17
Access Clarity 10.2 / 17
Operational Transparency 0.0 / 11
Contract Governance 8.1 / 10
Discoverability 5.6 / 9
Regulatory Posture 2.8 / 15
Agent readiness — 39/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 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 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 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
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/.
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/chessigma: 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 3

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

Chessigma Daily Puzzle API

The Daily Puzzle API from Chessigma — 1 operation(s) for daily puzzle.

Chessigma Elo Calculator API

The Elo Calculator API from Chessigma — 1 operation(s) for elo calculator.

Chessigma Game API

The Game API from Chessigma — 2 operation(s) for game.

Pricing Plans 1

Published pricing tiers and plan structures.

Chessigma Plans Pricing

5 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Chessigma Context

7 classes · 35 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Chessigma API Rules

14 rules · 12 errors 1 warnings 1 info

SPECTRAL

JSON Schema 5

Standalone JSON Schema definitions for this provider's data models.

DailyPuzzle

8 properties

JSON SCHEMA

EloResponse

8 properties

JSON SCHEMA

GameAnalysisResponse

4 properties

JSON SCHEMA

GameSubmissionResponse

4 properties

JSON SCHEMA

GameSubmission

1 properties

JSON SCHEMA

Security Posture 1

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

Chessigma Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Chessigma Agentic Access

4 operations · 1 acting

4 operations · 1 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral
Spectral
 JSONLD
JSONLD
 Vocabulary
Vocabulary
 DataModel
DataModel
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs
SDKs
 Packages
Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans
Plans
 Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: chessigma
name: Chessigma
image: https://www.chessigma.com/opengraph-image.png
description: Chessigma provides a free, no‑auth API for chess game analysis and daily puzzles. Users can submit PGN games,
  retrieve engine analysis, calculate rating changes, and access training puzzles without signup or rate‑limited keys. The
  platform runs Stockfish in the browser, offering compute‑free, unlimited analysis for Chess.com, Lichess and uploaded PGN
  files.
url: https://raw.githubusercontent.com/api-evangelist/chessigma/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-05 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-05'
modified: '2026-10-05'
tags:
- Company
- Chess
- API
- Free
- NoAuth
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/chessigma-agentic-access.yml
- type: Plans
  url: plans/chessigma-plans-pricing.yml
- type: Spectral
  url: rules/chessigma-rules.yml
- type: JSONLD
  url: json-ld/chessigma-context.jsonld
- type: Vocabulary
  url: vocabulary/chessigma-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/chessigma-data-model.yml
- type: ErrorCatalog
  url: errors/chessigma-problem-types.yml
- type: Conformance
  url: conformance/chessigma-conformance.yml
- type: LLMsTxt
  url: llms/chessigma-llms.txt
- type: WellKnown
  url: well-known/chessigma-well-known.yml
- type: Hosts
  url: hosts/chessigma-hosts.yml
- type: Vendors
  url: vendors/chessigma-vendors.yml
- type: SDKs
  url: packages/chessigma-packages.yml
- type: Packages
  url: packages/chessigma-packages.yml
- type: DomainSecurity
  url: security/chessigma-domain-security.yml
- type: Website
  url: https://www.chessigma.com
- type: Documentation
  url: https://www.chessigma.com/developers
- type: Blog
  url: https://www.chessigma.com/blog
- type: Pricing
  url: https://www.chessigma.com/pricing
- type: TermsOfService
  url: https://www.chessigma.com/tos
- type: PrivacyPolicy
  url: https://www.chessigma.com/privacy-policy
- type: Support
  url: https://www.chessigma.com/contact
apis:
- aid: chessigma:chessigma-daily-puzzle-api
  name: Chessigma Daily Puzzle API
  description: The Daily Puzzle API from Chessigma — 1 operation(s) for daily puzzle.
  humanURL: https://www.chessigma.com/developers
  baseURL: https://www.chessigma.com/public-api/v1
  tags:
  - Daily Puzzle
  properties:
  - type: OpenAPI
    url: openapi/chessigma-daily-puzzle-api-openapi.yml
  - type: JSONSchema
    url: json-schema/chessigma-daily-puzzle-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-elo-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-submission-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-submission-schema.json
- aid: chessigma:chessigma-elo-calculator-api
  name: Chessigma Elo Calculator API
  description: The Elo Calculator API from Chessigma — 1 operation(s) for elo calculator.
  humanURL: https://www.chessigma.com/developers
  baseURL: https://www.chessigma.com/public-api/v1
  tags:
  - Elo Calculator
  properties:
  - type: OpenAPI
    url: openapi/chessigma-elo-calculator-api-openapi.yml
  - type: JSONSchema
    url: json-schema/chessigma-daily-puzzle-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-elo-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-submission-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-submission-schema.json
- aid: chessigma:chessigma-game-api
  name: Chessigma Game API
  description: The Game API from Chessigma — 2 operation(s) for game.
  humanURL: https://www.chessigma.com/developers
  baseURL: https://www.chessigma.com/public-api/v1
  tags:
  - Game
  properties:
  - type: OpenAPI
    url: openapi/chessigma-game-api-openapi.yml
  - type: JSONSchema
    url: json-schema/chessigma-daily-puzzle-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-elo-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-submission-response-schema.json
  - type: JSONSchema
    url: json-schema/chessigma-game-submission-schema.json
x-submission-notes: Provider entity Arche Labs Ltd t/a Chessigma. Root soft-404s, so probe artifacts by content not status.
x-submission-probe: openapi.json 200 (OAS 3.1, server /public-api/v1); /public-api/v1/daily-puzzle 200 JSON; /.well-known/api-catalog
  200 linkset; llms.txt 200; /api/mcp initialize 200 (chessigma-mcp 2.0.0); invented path redirects to homepage (soft-404
  on www root).
x-submitted-by: mehdi@chessigma.com (apis.io/add, 2026-10-03T13:56:11.018Z)
x-enrichment:
  date: '2026-10-05'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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