c/side
c/side (cside) is a client-side security platform that detects script attacks, AI agents, account takeover, and fraud at the browser layer. It provides active runtime detection that watches what third-party scripts, users, and agents actually do as they execute in the live browser session, in real time, rather than relying on static scans or block-lists, and it automates PCI DSS 4.0.1 requirements 6.4.3 and 11.6.1 (validated by a VikingCloud QSA). cside deploys as a single JavaScript snippet with no proxy and no DNS changes, and was the first client-side security product with integrated AI analysis. The platform protects websites from malicious third-party scripts, e-skimming, Magecart, and supply chain attacks, and adds device fingerprinting (102+ signals), VPN/bot/AI-agent detection, chargeback evidence, and privacy monitoring for GDPR, CCPA, and HIPAA. Founded in 2024 and backed by Uncork Capital, cside integrates via a CLI, Next.js and Vite plugins, a manual script tag, and Salesforce Lightning, and sends security alerts through webhook, S3, and Jira/Linear notification endpoints. cside publishes an llms.txt, a public read-only MCP server, and a Trust Center covering SOC 2 Type II, PCI SAQ-D, and ISO 27001.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles c/side the way a machine reads it — 5 machine-readable artifacts, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — c/side scores 44.2/100 (developing), with a separate agent-readiness read of 26/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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title="c/side on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/c-side.svg"
alt="c/side Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/c-side/)<!-- Kin Score · API Evangelist -->
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title="c/side on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/c-side/card.svg"
alt="c/side Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile c/side
Each block below is one kind of artifact we hold for c/side. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
c/side MCP Server
cside operates a public, read-only remote MCP (Model Context Protocol) server at https://mcp.cside.com that exposes cside.com marketing-site and docs.cside.com documentation con...
MCP SERVEREvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
C Side Webhooks
ASYNCAPISecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for c/side — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 4
Pagination, idempotency, versioning, errors, and events
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 6
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/c-side · machine-readable index on apis.io
This is an independent, third-party profile of c/side, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.