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OpenAPI Specification

openapi: 3.2.0
info:
  title: CEX.IO Exchange REST API (legacy) Private API
  version: '2026-10-13'
  description: 'The original CEX.IO Exchange REST API. Per docs: public methods limited to 600 requests per 10 minutes, private methods 2000 requests per 10 minutes.'
  contact:
    url: https://support.cex.io/en/
  termsOfService: https://cex.io/terms
servers:
- url: https://cex.io/api
tags:
- name: Private
paths:
  /balance/:
    post:
      operationId: legacy_post_balance
      summary: Account balance
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /open_orders/:
    post:
      operationId: legacy_post_open_orders
      summary: Open orders
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /open_orders/{symbol1}/{symbol2}:
    post:
      operationId: legacy_post_open_orders_symbol1_symbol2
      summary: Open orders by pair
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      parameters:
      - name: symbol1
        in: path
        required: true
        schema:
          type: string
      - name: symbol2
        in: path
        required: true
        schema:
          type: string
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /open_orders/{symbol1}:
    post:
      operationId: legacy_post_open_orders_symbol1
      summary: Open orders by symbol
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      parameters:
      - name: symbol1
        in: path
        required: true
        schema:
          type: string
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /mass_cancel_place_orders:
    post:
      operationId: legacy_post_mass_cancel_place_orders
      summary: Mass cancel place orders
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /active_orders_status:
    post:
      operationId: legacy_post_active_orders_status
      summary: Active order status
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /archived_orders/{symbol1}/{symbol2}:
    post:
      operationId: legacy_post_archived_orders_symbol1_symbol2
      summary: Archived orders
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      parameters:
      - name: symbol1
        in: path
        required: true
        schema:
          type: string
      - name: symbol2
        in: path
        required: true
        schema:
          type: string
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /cancel_order/:
    post:
      operationId: legacy_post_cancel_order
      summary: Cancel order
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /cancel_orders/{symbol1}/{symbol2}:
    post:
      operationId: legacy_post_cancel_orders_symbol1_symbol2
      summary: Cancel all orders for given pair
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      parameters:
      - name: symbol1
        in: path
        required: true
        schema:
          type: string
      - name: symbol2
        in: path
        required: true
        schema:
          type: string
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /place_order/{symbol1}/{symbol2}:
    post:
      operationId: legacy_post_place_order_symbol1_symbol2
      summary: Place order
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      parameters:
      - name: symbol1
        in: path
        required: true
        schema:
          type: string
      - name: symbol2
        in: path
        required: true
        schema:
          type: string
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /get_order/:
    post:
      operationId: legacy_post_get_order
      summary: Get order details
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /get_order_tx/:
    post:
      operationId: legacy_post_get_order_tx
      summary: Get order transactions
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /get_address/:
    post:
      operationId: legacy_post_get_address
      summary: Get crypto address
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /get_crypto_address:
    post:
      operationId: legacy_post_get_crypto_address
      summary: Get crypto addresses for all blockchains
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /get_myfee/:
    post:
      operationId: legacy_post_get_myfee
      summary: Get my fee
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
  /cancel_replace_order/{symbol1}/{symbol2}:
    post:
      operationId: legacy_post_cancel_replace_order_symbol1_symbol2
      summary: Cancel replace order
      tags:
      - Private
      x-source: https://docs.cex.io/
      responses:
        '200':
          description: OK
        '400':
          description: Bad Request
        '429':
          description: API rate limit exceeded
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      parameters:
      - name: symbol1
        in: path
        required: true
        schema:
          type: string
      - name: symbol2
        in: path
        required: true
        schema:
          type: string
      description: 'Private method: authenticated with an API key, signature and nonce (see docs.cex.io Authentication).'
externalDocs:
  url: https://docs.cex.io/
x-generated:
  method: generated
  from: documentation
  engine: hand-transcribed by enrichment agent (claude-opus-5-5)
  date: '2026-10-13'
  note: No machine-readable contract is published by CEX.IO. Every path below appears verbatim on the cited docs page; request/response schemas are NOT modelled and must be read from the docs.