CEX.IO
CEX.IO is a cryptocurrency exchange founded in 2013 offering spot trading, buying and selling crypto with cards and bank transfers, staking and earn products, and a Prime brokerage service. It publishes two developer surfaces: the CEX.IO Spot Trading API (REST and WebSocket under trade.cex.io/api/spot) and the legacy CEX.IO Exchange API (REST under cex.io/api and WebSocket at ws.cex.io), both authenticated with API keys and HMAC signatures.
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 CEX.IO the way a machine reads it — 13 machine-readable artifacts across 9 APIs, 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 — CEX.IO scores 44.4/100 (developing), with a separate agent-readiness read of 20/100 (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.
Why this profile is thin
the company publishes no developer documentation host and no machine-readable contract on its own domain
This is an honest zero, not a gap in our research. CEX.IO does not appear to expose an API, so there is nothing here for us to index and nothing for them to fix.
What we probed
https://cex.io→ HTTP 200
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 2026-10-17 · rubric v0.24.0
Put this on your own site. The badge is drawn live from CEX.IO's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/cex-io/"
title="CEX.IO on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/cex-io.svg"
alt="CEX.IO Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/cex-io/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/cex-io/"
title="CEX.IO on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/cex-io/card.svg"
alt="CEX.IO 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 CEX.IO
Each block below is one kind of artifact we hold for CEX.IO. 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.
APIs 9
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
CEX.IO Accounts API
The Accounts API from CEX.IO — 4 operation(s) for accounts.
CEX.IO Fees API
The Fees API from CEX.IO — 3 operation(s) for fees.
CEX.IO Funding API
The Funding API from CEX.IO — 5 operation(s) for funding.
CEX.IO History API
The History API from CEX.IO — 2 operation(s) for history.
CEX.IO Market Data API
The Market Data API from CEX.IO — 4 operation(s) for market data.
CEX.IO Orders API
The Orders API from CEX.IO — 4 operation(s) for orders.
CEX.IO Private API
The Private API from CEX.IO — 16 operation(s) for private.
CEX.IO Public API
The Public API from CEX.IO — 11 operation(s) for public.
CEX.IO Public Market Data API
The Public Market Data API from CEX.IO — 8 operation(s) for public market data.
Scroll within the panel for all 9 ·
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Cex Io Rate Limits
RATE LIMITSSpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
CEX.IO API Rules
SPECTRALSecurity Posture 2
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 CEX.IO — 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 1
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 4
Pagination, idempotency, versioning, errors, and events
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 3
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/cex-io · machine-readable index on apis.io
This is an independent, third-party profile of CEX.IO, 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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