Coinbase Sell API

openapi: 3.2.0
info:
  title: Coinbase Onramp Sell API
  description: The Coinbase Onramp API allows developers to integrate fiat-to-crypto purchasing and crypto-to-fiat selling directly into their applications. It provides REST APIs to discover available buy and sell options, generate price quotes, create one-click-buy URLs, and manage session tokens for embedded onramp experiences. The API supports multiple fiat currencies and payment methods.
  version: '1.0'
  contact:
    name: Coinbase Developer Support
    url: https://help.coinbase.com
  termsOfService: https://www.coinbase.com/legal/user-agreement
servers:
- url: https://api.developer.coinbase.com/onramp/v1
  description: Production Server
security:
- bearerAuth: []
tags:
- name: Sell
  description: Endpoints for discovering sell options and generating sell quotes for crypto-to-fiat transactions.
paths:
  /sell/options:
    get:
      operationId: getSellOptions
      summary: Get sell options
      description: Provides clients with a way to discover the available options for selling cryptocurrency. Returns supported fiat deposit currencies and available crypto assets.
      tags:
      - Sell
      parameters:
      - name: country
        in: query
        required: true
        description: ISO 3166-1 alpha-2 country code
        schema:
          type: string
          minLength: 2
          maxLength: 2
      - name: subdivision
        in: query
        description: ISO 3166-2 subdivision code
        schema:
          type: string
      responses:
        '200':
          description: Successfully retrieved sell options
          content:
            application/json:
              schema:
                type: object
                properties:
                  sell_currencies:
                    type: array
                    description: Crypto assets available for selling
                    items:
                      $ref: '#/components/schemas/PurchaseCurrency'
                  cash_out_currencies:
                    type: array
                    description: Fiat currencies for receiving funds
                    items:
                      $ref: '#/components/schemas/PaymentCurrency'
        '401':
          description: Unauthorized
  /sell/quote:
    post:
      operationId: createSellQuote
      summary: Create sell quote
      description: Generates a price quote for selling cryptocurrency. Returns the estimated fiat amount that will be received for a given crypto amount. Rate limited to 10 requests per second per app ID.
      tags:
      - Sell
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SellQuoteRequest'
      responses:
        '200':
          description: Successfully generated sell quote
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SellQuote'
        '400':
          description: Bad request - Invalid parameters
        '401':
          description: Unauthorized
        '429':
          description: Rate limit exceeded
components:
  schemas:
    PurchaseCurrency:
      type: object
      description: A cryptocurrency available for purchase
      properties:
        id:
          type: string
          description: Asset identifier
        name:
          type: string
          description: Asset name
        symbol:
          type: string
          description: Asset symbol
        icon_url:
          type: string
          format: uri
          description: URL for the asset icon
        networks:
          type: array
          description: Supported blockchain networks
          items:
            type: object
            properties:
              name:
                type: string
                description: Network name
              display_name:
                type: string
                description: Network display name
              chain_id:
                type: string
                description: Blockchain chain ID
              contract_address:
                type: string
                description: Token contract address on this network
    SellQuote:
      type: object
      description: A price quote for selling cryptocurrency
      properties:
        coinbase_fee:
          type: object
          description: Coinbase fee details
          properties:
            amount:
              type: string
              description: Fee amount
            currency:
              type: string
              description: Fee currency
        cash_out_subtotal:
          type: object
          description: Subtotal cash out amount
          properties:
            amount:
              type: string
              description: Subtotal amount
            currency:
              type: string
              description: Currency
        cash_out_total:
          type: object
          description: Total cash out amount
          properties:
            amount:
              type: string
              description: Total amount
            currency:
              type: string
              description: Currency
        quote_id:
          type: string
          description: Unique quote identifier
    PaymentCurrency:
      type: object
      description: A fiat currency available for payments
      properties:
        id:
          type: string
          description: Currency identifier
        name:
          type: string
          description: Currency name
        symbol:
          type: string
          description: Currency symbol
        min_amount:
          type: string
          description: Minimum transaction amount
        max_amount:
          type: string
          description: Maximum transaction amount
    SellQuoteRequest:
      type: object
      description: Request body for generating a sell quote
      required:
      - sell_currency
      - sell_amount
      - cash_out_currency
      - country
      properties:
        sell_currency:
          type: string
          description: Cryptocurrency to sell
        sell_amount:
          type: string
          description: Amount of crypto to sell
        cash_out_currency:
          type: string
          description: Fiat currency to receive
        country:
          type: string
          description: ISO 3166-1 alpha-2 country code
        subdivision:
          type: string
          description: ISO 3166-2 subdivision code
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Bearer token authentication using a CDP API key.
externalDocs:
  description: Coinbase Onramp Documentation
  url: https://docs.cdp.coinbase.com/onramp/docs/welcome