Sideko is an API tooling generation platform that turns an OpenAPI specification into a complete developer-tooling suite — SDKs in six languages (Python, TypeScript, Java, Go, C#, Rust), Model Context Protocol (MCP) servers for AI agents, on-brand documentation sites with an Automatic MCP surface, mock servers, and CLI tooling — without writing generation code. The platform's "Hybrid Codegen" pairs deterministic OpenAPI-driven generation with guided AI customization, and ships LLM coding-assistant rule files (Claude Code, Cursor, Gemini, GitHub Copilot) alongside each SDK so agents can extend the generated code without breaking regeneration. Customers include Prudential Financial and Magic Hour AI; Sideko's published Stripe SDK benchmark generated over one million lines of SDK code in under sixty seconds.
Sideko publishes 18 APIs on the APIs.io network, including API Projects API, API Versions API, Authentication API, and 15 more. Tagged areas include CLI, Documentation, Mock Servers, Platform, and SDK.
The Sideko catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.
Sideko’s developer surface includes authentication, documentation, signup flow, pricing, engineering blog, GitHub presence, changelog, and 9 more developer resources.
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/.
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/sideko: open an issue to ask a question, or submit a pull request to add artifacts.
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Sideko is an area vendor: providers adopt it to run part of their developer surface. This is the Kin Score checks its features can move for a provider that adopts it, what each one really earns, and what it earns nothing for.
sdk generationcapability map7 features checked 2026-09-25 · rubric v0.22.0
Sideko can lift the SDK pointers (Python, TypeScript, Go, Rust, Java and C# GA, Ruby beta), a CLI, documentation and reference pointers, and a sandbox pointer through its mock servers. Each counts only when declared in apis.yml. Its docs MCP is one template across customers, so platform (0.25). Sideko’s own docs on the same platform are a JavaScript shell to a plain reader: 11 characters of text before rendering. That puts any docs-derived probe on a Sideko site at risk of a false negative. The CLAUDE.md files it writes into SDKs are coding-assistant context, not Agent Skills.
Agent Readiness4.8 of 139 pts
Contract Quality6.0 of 211 pts
Developer Ergonomics20.0 of 42 pts
Check
Earns
Through
MCP Serverplatform Agent ReadinessA docs-search server generated automatically for every Sideko docs site is one tool shape across customers, which 0.22.0 grades platform (0.25). It searches docs; it does not call the API.
Request/Response Examplespartial Agent ReadinessSDK example snippets are not request/response examples in the contract, so only the Code Samples link fallback (0.25) is reached.
Documentationsaturated Developer Ergonomics95% of providers with a contract, docs and a reference already earn this; the vendor cannot move it for most of its buyers.
API referencesaturated Developer Ergonomics94% of providers with a contract, docs and a reference already earn this; the vendor cannot move it for most of its buyers.
Operations have descriptionsconditional Contract QualityThe linter reports. The provider has to write the missing descriptions and republish the contract.
Across 8977 providers that publish a contract, adopting Sideko would move 8957. Median lift: composite +6.2 (90th percentile +7.8), agent readiness +2.2 (+3.5). Conditional rows excluded.
What Sideko ships that earns nothing (3)
LLM coding-assistant files (CLAUDE.md) — A CLAUDE.md inside an SDK repo is coding-assistant context, not an Agent Skill, and it is not declared on the provider’s surface.
SDK generation — SDK snippets are not request or response examples on the contract’s operations.
SDK generation — Generation does not add an idempotency key to the contract.
A model, not a score. Adopting this vendor changes a provider's Kin Score only when the provider publishes the resulting artifacts on its own surface; nothing here writes a score, and no sponsorship or partnership can. The rating is not for sale → · Full vendor facets artifact
The Sideko CLI is a Rust binary (current release v1.6.3, Aug 2025) that provides command-line access to the Sideko platform. Commands are organized into five resource groups — `...
GitHub Action that keeps Sideko-generated SDKs up to date with their parent API. Runs `sideko sdk update` in CI, opens a versioned PR with the regenerated SDK, and preserves any...
The Sideko Node.js SDK provides TypeScript and JavaScript bindings for the Sideko API. Generated by Sideko's own pipeline from the Sideko OpenAPI specification.
Sample TypeScript SDK for the Stripe REST API, Sideko-generated as the benchmark behind the "Stripe API Challenge" blog post (over 1 million lines of SDK code generated in under...
Manage versioned OpenAPI specifications inside an API project. Each version is the source of truth that drives SDK, MCP, mock-server, and documentation generation.
Publish and manage API documentation sites generated from OpenAPI specifications, including on-brand themes, custom domains, and AI-ready MCP documentation surfaces.
Trigger and manage SDK generation jobs for the six supported languages Python, TypeScript, Java, Go, C#, and Rust, with optional GitHub Actions and LLM coding-assistant rule fil...
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