Coinbase Buy API

openapi: 3.1.0
info:
  title: Coinbase Advanced Trade Accounts Buy API
  description: The Coinbase Advanced Trade API provides programmatic access to advanced trading features on the Coinbase platform. Developers can automate market, limit, and stop-limit orders, manage portfolios, retrieve real-time and historical market data, and monitor fees. The REST API is available at api.coinbase.com/api/v3/brokerage and supports authenticated access using API keys with HMAC SHA-256 signatures. Public market data endpoints do not require authentication.
  version: '3.0'
  contact:
    name: Coinbase Developer Support
    url: https://help.coinbase.com
  termsOfService: https://www.coinbase.com/legal/user-agreement
servers:
- url: https://api.coinbase.com/api/v3/brokerage
  description: Production Server
security:
- apiKeyAuth: []
tags:
- name: Buy
  description: Endpoints for discovering buy options, generating buy quotes, and retrieving buy configuration for fiat-to-crypto purchases.
paths:
  /buy/options:
    get:
      operationId: getBuyOptions
      summary: Get buy options
      description: Provides clients with a way to discover the available options for buying cryptocurrency with Coinbase Onramp. Returns supported fiat currencies and available crypto assets that can be passed into the Buy Quote API. Clients should call this API periodically for each country they support and cache the response.
      tags:
      - Buy
      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 buy options
          content:
            application/json:
              schema:
                type: object
                properties:
                  payment_currencies:
                    type: array
                    description: Available fiat currencies with transaction limits
                    items:
                      $ref: '#/components/schemas/PaymentCurrency'
                  purchase_currencies:
                    type: array
                    description: Cryptocurrency assets available for purchase
                    items:
                      $ref: '#/components/schemas/PurchaseCurrency'
        '401':
          description: Unauthorized - Invalid or missing authentication
  /buy/quote:
    post:
      operationId: createBuyQuote
      summary: Create buy quote
      description: Generates a price quote for buying cryptocurrency. Returns the estimated amount of crypto that will be received for a given fiat amount. Rate limited to 10 requests per second per app ID.
      tags:
      - Buy
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BuyQuoteRequest'
      responses:
        '200':
          description: Successfully generated buy quote
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BuyQuote'
        '400':
          description: Bad request - Invalid parameters
        '401':
          description: Unauthorized
        '429':
          description: Rate limit exceeded
  /buy/config:
    get:
      operationId: getBuyConfig
      summary: Get buy config
      description: Retrieves the buy configuration for the onramp widget, including supported countries, payment methods, and available assets.
      tags:
      - Buy
      parameters:
      - name: country
        in: query
        required: true
        description: ISO 3166-1 alpha-2 country code
        schema:
          type: string
          minLength: 2
          maxLength: 2
      responses:
        '200':
          description: Successfully retrieved buy config
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BuyConfig'
        '401':
          description: Unauthorized
components:
  schemas:
    BuyQuote:
      type: object
      description: A price quote for buying cryptocurrency
      properties:
        coinbase_fee:
          type: object
          description: Coinbase fee details
          properties:
            amount:
              type: string
              description: Fee amount
            currency:
              type: string
              description: Fee currency
        network_fee:
          type: object
          description: Network fee details
          properties:
            amount:
              type: string
              description: Fee amount
            currency:
              type: string
              description: Fee currency
        payment_subtotal:
          type: object
          description: Subtotal before fees
          properties:
            amount:
              type: string
              description: Subtotal amount
            currency:
              type: string
              description: Subtotal currency
        payment_total:
          type: object
          description: Total payment amount
          properties:
            amount:
              type: string
              description: Total amount
            currency:
              type: string
              description: Total currency
        purchase_amount:
          type: object
          description: Crypto amount to be received
          properties:
            amount:
              type: string
              description: Purchase amount
            currency:
              type: string
              description: Crypto 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
    BuyQuoteRequest:
      type: object
      description: Request body for generating a buy quote
      required:
      - purchase_currency
      - payment_amount
      - payment_currency
      - country
      properties:
        purchase_currency:
          type: string
          description: Cryptocurrency to purchase
        payment_amount:
          type: string
          description: Amount in fiat currency
        payment_currency:
          type: string
          description: Fiat currency for payment
        payment_method:
          type: string
          description: Payment method type
        country:
          type: string
          description: ISO 3166-1 alpha-2 country code
        subdivision:
          type: string
          description: ISO 3166-2 subdivision code
    BuyConfig:
      type: object
      description: Configuration for the onramp buy widget
      properties:
        countries:
          type: array
          description: Supported countries
          items:
            type: object
            properties:
              id:
                type: string
                description: Country code
              subdivisions:
                type: array
                description: Available subdivisions
                items:
                  type: string
              payment_methods:
                type: array
                description: Available payment methods
                items:
                  type: string
    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
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: CB-ACCESS-KEY
      description: Coinbase API key authentication using HMAC SHA-256 signatures. Requires CB-ACCESS-KEY, CB-ACCESS-SIGN, and CB-ACCESS-TIMESTAMP headers.
externalDocs:
  description: Coinbase Advanced Trade API Documentation
  url: https://docs.cdp.coinbase.com/coinbase-app/advanced-trade-apis/rest-api