Kongregate

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Full detail: Where this data comes from

Kongregate is a browser-game platform and publisher hosting thousands of free online games. For game developers it operates a two-part developer API: a CDN-delivered client JavaScript API (with Unity WebGL bindings) for player identity, statistics and the Kreds purchase flow, and a server-side REST API at api.kongregate.com for authentication, virtual-goods inventory, leaderboards, guilds and characters.

Backed by: lightspeed-venture-partners, uncork-capital — https://www.kongregate.com

APIs

API	Base URL	Docs
Kongregate Server-Side API	https://api.kongregate.com/api	docs
Kongregate Client JavaScript API	https://cdn1.kongregate.com/javascripts/kongregate_api.js	docs

Artifacts

• openapi/ — first-party OpenAPI 3.1.0 (15 operations), harvested verbatim from the provider's ReadMe reference pages
• overlays/ — API Evangelist enhancements (tags, missing securitySchemes, spec-defect notes)
• llms/ — provider-published llms.txt, saved verbatim
• mcp/ — candidate MCP tool surface derived from the spec (no official server exists)
• skills/ — four packaged Agent Skills grounded in real operationIds
• agentic-access/ — recommended x-agentic-access contracts for all 15 operations
• authentication/, conventions/, errors/, data-model/, conformance/, lifecycle/
• asyncapi/ — the API Callback (webhook) catalogue and its HMAC-SHA256 signed-request scheme
• packages/, sandbox/, well-known/, security/

Notable findings

• Errors are returned as HTTP 200 with success: false in the body. Clients that branch on HTTP status will read failed authentication as success.
• components.securitySchemes is empty in the published spec even though every operation requires an api_key, so generated clients cannot authenticate.
• No idempotency contract, while use_item decrements inventory and add-type statistics accumulate — both unsafe to retry blindly.
• No status page, SLA, changelog, deprecation policy, or /.well-known/ surface.
• Two path templates mix OpenAPI {scope} and Rails :statistic_id styles and will not substitute correctly in generated clients.