openapi: 3.0.3
info:
  title: NOWPayments Authentication Currencies API
  description: 'NOWPayments is a crypto payment gateway that enables businesses to accept 300+ cryptocurrencies, create payment invoices, process recurring subscriptions, and manage merchant mass payouts. The API supports automatic coin conversion, IPN webhooks, and fiat withdrawals.

    '
  version: 1.0.0
  contact:
    name: NOWPayments Support
    email: support@nowpayments.io
    url: https://nowpayments.io/help
  termsOfService: https://nowpayments.io/terms
servers:
- url: https://api.nowpayments.io/v1
  description: Production server
- url: https://api.sandbox.nowpayments.io/v1
  description: Sandbox server
security:
- ApiKeyAuth: []
tags:
- name: Currencies
  description: Supported cryptocurrency listings
paths:
  /currencies:
    get:
      operationId: getCurrencies
      summary: Get available currencies
      description: Returns a list of all cryptocurrencies available for payment.
      tags:
      - Currencies
      responses:
        '200':
          description: List of available currencies
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CurrenciesResponse'
              example:
                currencies:
                - btc
                - eth
                - ltc
                - xrp
                - usdt
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Missing or invalid API key
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    CurrenciesResponse:
      type: object
      properties:
        currencies:
          type: array
          description: List of supported currency codes
          items:
            type: string
          example:
          - btc
          - eth
          - ltc
          - xrp
          - usdt
    ErrorResponse:
      type: object
      properties:
        message:
          type: string
          description: Error message
        errors:
          type: array
          description: Detailed error list
          items:
            type: string
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: NOWPayments API key obtained from your merchant dashboard
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: JWT token obtained from the /auth endpoint (required for mass payout operations)
externalDocs:
  description: NOWPayments API Documentation
  url: https://nowpayments.io/help/api