Gessa

Gessa is an AI‑powered browser game platform that lets creators build, share, and play multiplayer games directly in the web. It offers free AI‑generated models, textures, audio, and a built‑in game engine with WebGPU/WebGL support. Players can discover games, join friends, and collaborate on projects, while developers access API keys with scoped permissions for integration. The service combines a community hub, AI tools, and real‑time networking to enable rapid game creation and distribution.

Gessa is listed with 2 APIs on the APIs.io network. Tagged areas include Gaming, Artificial Intelligence, Browser, Multiplayer, and Platform.

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

Gessa’s developer surface includes authentication, documentation, engineering blog, getting-started guide, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.9/100 emerging Agent 18/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessSelf serve

2 APIs

Gaming Artificial Intelligence Browser Multiplayer Platform

Kin Score

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

Composite quality — 25.9/100 · emerging

Contract Quality 1.9 / 21

Developer Ergonomics 8.9 / 17

Access Clarity 2.9 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.8 / 9

Regulatory Posture 2.6 / 15

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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 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 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author 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 →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 8.9 — up to +22.8 composite points Ask about this →
Access Clarity scores 17.0 — up to +16.6 composite points Ask about this →
Operational Transparency scores 0.0 — up to +13.0 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/gessa-ai/apis.yml: open an issue on github.com/api-evangelist/gessa-ai 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 2

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

Gessa AI

Gessa provides a developer platform for AI‑generated games and related services.

Gessa API

Gessa API as documented publicly: 162 operations. Contract generated from the documentation by API Evangelist (2026-11-09); not the provider's own document.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Gessa API Rules

31 rules · 29 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Gessa Authentication

1 scheme

SECURITY

Gessa Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Vocabulary

Vocabulary

Conformance

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: gessa-ai
name: Gessa
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Self-serve signup
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://gessa.ai/og.png
description: Gessa is an AI‑powered browser game platform that lets creators build, share, and play multiplayer games directly
  in the web. It offers free AI‑generated models, textures, audio, and a built‑in game engine with WebGPU/WebGL support. Players
  can discover games, join friends, and collaborate on projects, while developers access API keys with scoped permissions
  for integration. The service combines a community hub, AI tools, and real‑time networking to enable rapid game creation
  and distribution.
url: https://artifacts.apis.io/gessa-ai/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-09 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-09'
modified: '2026-11-09'
tags:
- Gaming
- Artificial Intelligence
- Browser
- Multiplayer
- Platform
tags_raw:
- Gaming
- AI
- Browser
- Multiplayer
- Platform
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/gessa-ai-rules.yml
- type: Vocabulary
  url: vocabulary/gessa-ai-vocabulary.yml
- type: Authentication
  url: authentication/gessa-ai-authentication.yml
- type: Conformance
  url: conformance/gessa-ai-conformance.yml
- type: LLMsTxt
  url: llms/gessa-ai-llms.txt
- type: WellKnown
  url: well-known/gessa-ai-well-known.yml
- type: Hosts
  url: hosts/gessa-ai-hosts.yml
- type: Vendors
  url: vendors/gessa-ai-vendors.yml
- type: SDKs
  url: packages/gessa-ai-packages.yml
- type: Packages
  url: packages/gessa-ai-packages.yml
- type: TermsOfService
  url: https://gessa.ai/terms/
- type: PrivacyPolicy
  url: https://gessa.ai/privacy/
- type: Documentation
  url: https://gessa.ai/docs/
- type: DeveloperPortal
  url: https://gessa.ai/developers/
- type: Blog
  url: https://gessa.ai/blog/
- type: GettingStarted
  url: https://gessa.ai/docs/creator/mcp/quickstart/
- type: DomainSecurity
  url: security/gessa-ai-domain-security.yml
- type: Website
  url: https://gessa.ai/
apis:
- name: Gessa AI
  description: Gessa provides a developer platform for AI‑generated games and related services.
  humanURL: https://gessa.ai/developers/
  x-coverage:
    state: unreadable
    reason: js-rendered-docs
    detail: Developer pages are rendered as a JavaScript SPA, no machine‑readable OpenAPI spec is publicly available.
    evidence:
    - url: https://gessa.ai/developers/
      status: 200
    checked: '2026-11-09'
  aid: gessa-ai:gessa-ai
- aid: gessa-ai:gessa-ai-api
  name: Gessa API
  description: 'Gessa API as documented publicly: 162 operations. Contract generated from the documentation by API Evangelist
    (2026-11-09); not

    the provider''s own document.'
  humanURL: https://gessa.ai/docs/reference/action-catalog
  baseURL: https://api.gessa.ai
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/gessa-ai-openapi-generated.yml
    x-provenance: generated
x-enrichment:
  date: '2026-11-09'
  status: enriched
  artifacts_added: 18
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Gessa API — frequently asked questions

Does Gessa have an API?

Yes. APIs.io lists 2 APIs from Gessa, including Gessa AI and Gessa API.

Is there an OpenAPI specification for the Gessa API?

Yes. APIs.io indexes 1 OpenAPI specification for Gessa, each linked for download from this page.

How do I authenticate with the Gessa API?

Gessa uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Gessa Authentication.

Is the Gessa API ready for AI agents?

Gessa has a Kin Score of 25.9 out of 100 (emerging) and an Agent Readiness score of 18.3 (agent-aware), scored by API Evangelist on 2026-11-13.

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