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.

CEX.IO is listed with 9 APIs on the APIs.io network, including Accounts API, Fees API, Funding API, and 6 more. Tagged areas include Company, Cryptocurrency, Exchange, Trading, and Market Data.

The CEX.IO catalog on APIs.io includes 1 Spectral governance ruleset.

CEX.IO’s developer surface includes authentication, documentation, API reference, getting-started guide, support, pricing, engineering blog, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

37.9/100 thin ▼ -7.8 Agent 22/100 agent aware Heartbeat 48/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

9 APIs

Company Cryptocurrency Exchange Trading Market Data WebSocket Financial Services

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 37.9/100 · thin

Contract Quality 8.8 / 19

Developer Ergonomics 5.5 / 15

Access Clarity 2.4 / 15

Operational Transparency 4.4 / 10

Contract Governance 2.0 / 9

Discoverability 6.0 / 8

Regulatory Posture 2.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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 Securities & Market Data 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/.

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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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 15.8 — up to +16.8 composite points
Contract Quality scores 47.1 — up to +13.2 composite points
Developer Ergonomics scores 36.9 — up to +12.6 composite points

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.

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/cex-io/apis.yml: open an issue on github.com/api-evangelist/cex-io 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 →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

WebSockets

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 9

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 for all 9

CEX.IO API pricing

Rate limits

Spot Trading public API calls: CEX.IO Spot Trading limits Public API calls to maximum of 100 points per minute
Spot Trading private API calls: CEX.IO Spot Trading limits Private API calls to maximum of 200 points per minute
Legacy Exchange REST public methods: REST API public methods are limited with 600 requests per 10 minutes

All 4 limits →

Rate Limits 1

Documented rate limits and quota policies.

Cex Io Rate Limits

4 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

CEX.IO

SLA

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

CEX.IO API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Cex Io Authentication

2 schemes

SECURITY

Cex Io Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

ErrorCatalog

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Newsroom

Newsroom

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: cex-io
name: CEX.IO
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: none
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://static.cex.io/img/landing-img/index.png
description: '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.'
url: https://raw.githubusercontent.com/api-evangelist/cex-io/refs/heads/main/apis.yml
x-type: company
x-source: harvest:market-gap:crypto-exchanges
x-tier: profiled
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- Company
- Cryptocurrency
- Exchange
- Trading
- Market Data
- WebSocket
- Financial Services
tags_raw:
- Company
- Cryptocurrency
- Exchanges
- Trading
- Market Data
- WebSockets
- Financial Services
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/cex-io-rate-limits.yml
- type: Spectral
  url: rules/cex-io-rules.yml
- type: Vocabulary
  url: vocabulary/cex-io-vocabulary.yml
- type: Authentication
  url: authentication/cex-io-authentication.yml
- type: ErrorCatalog
  url: errors/cex-io-problem-types.yml
- type: Conformance
  url: conformance/cex-io-conformance.yml
- type: LLMsTxt
  url: llms/cex-io-llms.txt
- type: SecurityTxt
  url: well-known/cex-io-support-security.txt
- type: WellKnown
  url: well-known/cex-io-well-known.yml
- type: Hosts
  url: hosts/cex-io-hosts.yml
- type: Vendors
  url: vendors/cex-io-vendors.yml
- type: SDKs
  url: packages/cex-io-packages.yml
- type: Packages
  url: packages/cex-io-packages.yml
- type: Newsroom
  url: https://cex.io/press
- type: Leadership
  url: https://cex.io/team
- type: DomainSecurity
  url: security/cex-io-domain-security.yml
- type: Website
  url: https://cex.io
- type: Documentation
  url: https://docs.cex.io/
- type: APIReference
  url: https://trade.cex.io/docs/
- type: GettingStarted
  url: https://support.cex.io/en/articles/4383397-getting-started
- type: Support
  url: https://support.cex.io/en/
- type: Pricing
  url: https://cex.io/prices
- type: TermsOfService
  url: https://cex.io/terms
- type: PrivacyPolicy
  url: https://cex.io/legal/privacy
- type: Blog
  url: https://blog.cex.io/
- type: GitHubOrganization
  url: https://github.com/cexiolabs
apis:
- aid: cex-io:cex-io-accounts-api
  name: CEX.IO Accounts API
  description: The Accounts API from CEX.IO — 4 operation(s) for accounts.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/cex-io-accounts-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-fees-api
  name: CEX.IO Fees API
  description: The Fees API from CEX.IO — 3 operation(s) for fees.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Fees
  properties:
  - type: OpenAPI
    url: openapi/cex-io-fees-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-funding-api
  name: CEX.IO Funding API
  description: The Funding API from CEX.IO — 5 operation(s) for funding.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Funding
  properties:
  - type: OpenAPI
    url: openapi/cex-io-funding-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-history-api
  name: CEX.IO History API
  description: The History API from CEX.IO — 2 operation(s) for history.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - History
  properties:
  - type: OpenAPI
    url: openapi/cex-io-history-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-market-data-api
  name: CEX.IO Market Data API
  description: The Market Data API from CEX.IO — 4 operation(s) for market data.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Market Data
  properties:
  - type: OpenAPI
    url: openapi/cex-io-market-data-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-orders-api
  name: CEX.IO Orders API
  description: The Orders API from CEX.IO — 4 operation(s) for orders.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Order
  tags_raw:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/cex-io-orders-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-private-api
  name: CEX.IO Private API
  description: The Private API from CEX.IO — 16 operation(s) for private.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Private
  properties:
  - type: OpenAPI
    url: openapi/cex-io-private-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-public-api
  name: CEX.IO Public API
  description: The Public API from CEX.IO — 11 operation(s) for public.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Public
  properties:
  - type: OpenAPI
    url: openapi/cex-io-public-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
- aid: cex-io:cex-io-public-market-data-api
  name: CEX.IO Public Market Data API
  description: The Public Market Data API from CEX.IO — 8 operation(s) for public market data.
  humanURL: https://trade.cex.io/docs/
  baseURL: https://trade.cex.io/api/spot/rest
  tags:
  - Public Market Data
  properties:
  - type: OpenAPI
    url: openapi/cex-io-public-market-data-api-openapi.yml
  - type: Documentation
    url: https://trade.cex.io/docs/
  - type: Documentation
    url: https://docs.cex.io/
x-coverage:
  state: none
  reason: no-developer-program
  method: derived
  generated: '2026-10-13'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes no developer documentation host and no machine-readable contract on its own domain
  evidence:
  - url: https://cex.io
    status: 200
x-enrichment:
  date: '2026-10-13'
  status: enriched
  artifacts_added: 12
  pass: local-v5

CEX.IO API — frequently asked questions

Does CEX.IO have an API?

Yes. APIs.io lists 9 APIs from CEX.IO, including CEX.IO Accounts API, CEX.IO Fees API and CEX.IO Funding API, and 6 more.

Is there an OpenAPI specification for the CEX.IO API?

Yes. APIs.io indexes 9 OpenAPI specifications for CEX.IO, each linked for download from this page.

How do I authenticate with the CEX.IO API?

CEX.IO uses bearer-token authentication (2 schemes). The details are profiled on APIs.io as Cex Io Authentication.

Is the CEX.IO API ready for AI agents?

CEX.IO has a Kin Score of 37.9 out of 100 (thin) and an Agent Readiness score of 22.1 (agent-aware), scored by API Evangelist on 2026-11-06.

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