> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gate.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 查询退款币种支持的网络

> 根据币种查询该币种支持退款的网络列表。

## 概述

本页说明 `GET /v2/refund/support/chains` 接口。完整的请求参数、响应结构与示例由上方关联的 OpenAPI 定义渲染。

## 说明

* 认证方式使用 GatePay 标准签名请求头。
* 本页展示普通商户接口。
* 通用签名规则请参见 [/api-reference/version/100/cn/common/securityAndSignature](/api-reference/version/100/cn/common/securityAndSignature)。


## OpenAPI

````yaml api-reference/version/100/cn/openapi/checkout-payment-openapi.json GET /v2/refund/support/chains
openapi: 3.1.0
info:
  title: GatePay 收银台支付 API
  description: Gate Pay 收银台支付 API，用于收银台下单、退款及订单查询。
  license:
    name: MIT
  version: 1.0.0
servers:
  - url: https://openplatform.gateapi.io
security: []
paths:
  /v2/refund/support/chains:
    get:
      summary: 查询退款币种支持的网络
      description: 根据币种查询该币种支持退款的网络列表。
      parameters:
        - $ref: '#/components/parameters/X-GatePay-Certificate-ClientId'
        - $ref: '#/components/parameters/X-GatePay-Signature'
        - $ref: '#/components/parameters/X-GatePay-Timestamp'
        - $ref: '#/components/parameters/X-GatePay-Nonce'
        - name: currency
          in: query
          required: true
          description: 拟下单的币种
          schema:
            type: string
            example: USDT
      responses:
        '200':
          description: 查询成功
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RefundSupportChainsResponse'
              examples:
                successResponse:
                  summary: 成功响应
                  value:
                    status: SUCCESS
                    code: '000000'
                    errorMessage: ''
                    data:
                      currency: USDT
                      chains:
                        - chain: ETH
                          currency: USDT
                          full_curr_type: USDT_ETH
                          symbol: USDT
                          explorer_url: https://etherscan.io
                          show_chain_name_en: Ethereum
                          hasWithdrawMemo: 0
                          withdrawPercent: 0.001
                          withdrawFix: '0'
                        - chain: BSC
                          currency: USDT
                          full_curr_type: USDT_BSC
                          symbol: USDT
                          explorer_url: https://bscscan.com
                          show_chain_name_en: BNB Smart Chain
                          hasWithdrawMemo: 0
                          withdrawPercent: 0.001
                          withdrawFix: '0'
components:
  parameters:
    X-GatePay-Certificate-ClientId:
      name: X-GatePay-Certificate-ClientId
      in: header
      required: true
      description: 商户客户端ID
      schema:
        type: string
        example: mZ96D37oKk-HrWJc
    X-GatePay-Signature:
      name: X-GatePay-Signature
      in: header
      required: true
      description: 签名
      schema:
        type: string
    X-GatePay-Timestamp:
      name: X-GatePay-Timestamp
      in: header
      required: true
      description: 时间戳（毫秒）
      schema:
        type: string
        example: '1695611256106'
    X-GatePay-Nonce:
      name: X-GatePay-Nonce
      in: header
      required: true
      description: 随机数
      schema:
        type: string
        example: '1260554069'
  schemas:
    RefundSupportChainsResponse:
      type: object
      properties:
        status:
          type: string
          description: 响应状态
          example: SUCCESS
        code:
          type: string
          description: 响应码
          example: '000000'
        errorMessage:
          type: string
          description: 错误信息
          example: ''
        data:
          type: object
          properties:
            currency:
              type: string
              description: 币种
            chains:
              type: array
              items:
                $ref: '#/components/schemas/ChainItem'
    ChainItem:
      type: object
      properties:
        chain:
          type: string
          description: 链名称
        currency:
          type: string
          description: 币种
        full_curr_type:
          type: string
          description: 完整币种类型
        symbol:
          type: string
          description: 符号
        explorer_url:
          type: string
          description: 区块链浏览器地址
        show_chain_name_en:
          type: string
          description: 链英文展示名
        hasWithdrawMemo:
          type: integer
          description: 是否需要提现备注
        withdrawPercent:
          type: number
          description: 提现百分比手续费
        withdrawFix:
          type: string
          description: 固定提现手续费

````