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, Free, and No Auth.

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 📡 Profile data on GitHub

40.3/100 developing ▼ -5.4 Agent 31/100 agent ready Heartbeat 93/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract 1 Agent Skills

Company Chess Free No Auth

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 40.3/100 · developing

Contract Quality 11.9 / 19

Developer Ergonomics 2.6 / 15

Access Clarity 8.3 / 15

Operational Transparency 0.0 / 10

Contract Governance 3.2 / 9

Discoverability 4.8 / 8

Regulatory Posture 2.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

7 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 17.3 — up to +16.5 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points
Contract Quality scores 63.4 — up to +9.2 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/chessigma/apis.yml: open an issue on github.com/api-evangelist/chessigma 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 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.

Agent Skills 1

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

chessigma-submit-and-retrieve-game

AGENT SKILL

Chessigma API pricing

Prices published by Chessigma, read 2026-10-05 from www.chessigma.com/pricing.

Plan	Price
Free	$0
Monthly	$14/month
Yearly	$97 billed once a year
Lifetime	$340
Lifetime Premium	$490

Plan details, limits and sources →

Billed by: subscription · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Chessigma Plans Pricing

5 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Chessigma

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Chessigma Finops

FINOPS

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

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

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

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

Pricing

TermsOfService

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)

aid: chessigma
name: Chessigma
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
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
- Free
- No Auth
tags_raw:
- 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

Chessigma API — frequently asked questions

Does Chessigma have an API?

Yes. APIs.io lists 3 APIs from Chessigma, including Chessigma Daily Puzzle API, Chessigma Elo Calculator API and Chessigma Game API.

Is there an OpenAPI specification for the Chessigma API?

Yes. APIs.io indexes 3 OpenAPI specifications for Chessigma, each linked for download from this page.

How much does the Chessigma API cost?

Chessigma publishes its prices; its Free plan is $0 as of 2026-10-05. APIs.io lists 5 pricing plans for Chessigma, with each plan's price, limits and inclusions under Pricing on this page.

Is the Chessigma API ready for AI agents?

Chessigma has a Kin Score of 40.3 out of 100 (developing) and an Agent Readiness score of 30.8 (agent-ready), scored by API Evangelist on 2026-11-06.

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