Coinbase Onramp API

openapi: 3.1.0
info:
  title: Coinbase Onramp 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
externalDocs:
  description: Coinbase Onramp Documentation
  url: https://docs.cdp.coinbase.com/onramp/docs/welcome
servers:
  - url: https://api.developer.coinbase.com/onramp/v1
    description: Production Server
tags:
  - name: Buy
    description: >-
      Endpoints for discovering buy options, generating buy quotes, and
      retrieving buy configuration for fiat-to-crypto purchases.
  - name: Sell
    description: >-
      Endpoints for discovering sell options and generating sell quotes for
      crypto-to-fiat transactions.
  - name: Session
    description: >-
      Manage session tokens for embedded onramp widget authentication.
security:
  - bearerAuth: []
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
  /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
  /token:
    post:
      operationId: createSessionToken
      summary: Create session token
      description: >-
        Creates a session token for authenticating the embedded onramp widget.
        The token is used to initialize the Coinbase Onramp widget within a
        third-party application.
      tags:
        - Session
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - destination_wallets
              properties:
                destination_wallets:
                  type: array
                  description: Wallet addresses to receive purchased crypto
                  items:
                    type: object
                    properties:
                      address:
                        type: string
                        description: Wallet address
                      blockchains:
                        type: array
                        description: Supported blockchains for this address
                        items:
                          type: string
                      assets:
                        type: array
                        description: Supported assets for this address
                        items:
                          type: string
                      supported_networks:
                        type: array
                        description: Supported network identifiers
                        items:
                          type: string
      responses:
        '200':
          description: Session token created
          content:
            application/json:
              schema:
                type: object
                properties:
                  token:
                    type: string
                    description: Session token for widget initialization
        '401':
          description: Unauthorized
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        Bearer token authentication using a CDP API key.
  schemas:
    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
    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
    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
    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
    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
    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
    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