openapi: 3.0.3
info:
  title: NOWPayments Authentication Estimates 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: Estimates
  description: Price estimation and minimum amounts
paths:
  /estimate:
    get:
      operationId: getEstimatePrice
      summary: Get estimated price
      description: 'Calculates the approximate price in cryptocurrency based on a given fiat or crypto amount. Useful for showing customers how much crypto they need to pay.

        '
      tags:
      - Estimates
      parameters:
      - name: amount
        in: query
        required: true
        description: Amount to convert
        schema:
          type: number
          format: double
          example: 100.5
      - name: currency_from
        in: query
        required: true
        description: Currency to convert from (e.g., usd, eur, btc)
        schema:
          type: string
          example: usd
      - name: currency_to
        in: query
        required: true
        description: Currency to convert to (e.g., btc, eth)
        schema:
          type: string
          example: btc
      responses:
        '200':
          description: Estimated price
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EstimateResponse'
              example:
                currency_from: usd
                amount_from: 100.5
                currency_to: btc
                estimated_amount: 0.00267
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /min-amount:
    get:
      operationId: getMinimumPaymentAmount
      summary: Get minimum payment amount
      description: 'Returns the minimum payment amount for a specific currency pair. Payments below this threshold cannot be processed.

        '
      tags:
      - Estimates
      parameters:
      - name: currency_from
        in: query
        required: true
        description: Source currency
        schema:
          type: string
          example: usd
      - name: currency_to
        in: query
        required: true
        description: Target cryptocurrency
        schema:
          type: string
          example: btc
      responses:
        '200':
          description: Minimum payment amount
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MinAmountResponse'
              example:
                currency_from: usd
                currency_to: btc
                min_amount: 5.0e-05
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    EstimateResponse:
      type: object
      properties:
        currency_from:
          type: string
          description: Source currency code
        amount_from:
          type: number
          format: double
          description: Source amount
        currency_to:
          type: string
          description: Target currency code
        estimated_amount:
          type: number
          format: double
          description: Estimated target amount
    MinAmountResponse:
      type: object
      properties:
        currency_from:
          type: string
          description: Source currency code
        currency_to:
          type: string
          description: Target currency code
        min_amount:
          type: number
          format: double
          description: Minimum payment amount in the target currency
    ErrorResponse:
      type: object
      properties:
        message:
          type: string
          description: Error message
        errors:
          type: array
          description: Detailed error list
          items:
            type: string
  responses:
    Unauthorized:
      description: Missing or invalid API key
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    BadRequest:
      description: Invalid request parameters
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  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