> ## 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.

# Create EVM Static Address

> For the same customer, create a static collection address that can correspond to multiple networks, applicable only to EVM networks.

**Note**: Under the same channelId, only one static collection address is allowed per network, and duplicate creation is not permitted.

## Overview

This page documents the `POST /merchant/open/v1/pay/fixedaddress/evm/save` endpoint. The full schema, parameters, and examples are rendered from the linked OpenAPI definition above.

For the same customer, create a static collection address that can correspond to multiple networks, applicable only to EVM networks.

## Notes

* Under the same `channelId`, only one static collection address is allowed per network, and duplicate creation is not permitted.
* Authentication uses the standard GatePay signed headers.
* This page documents the standard merchant endpoint.
* For shared signing rules, see [/api-reference/version/100/en/common/securityAndSignature](/api-reference/version/100/en/common/securityAndSignature).


## OpenAPI

````yaml /api-reference/version/100/en/openapi/fixed-address-openapi.json POST /merchant/open/v1/pay/fixedaddress/evm/save
openapi: 3.1.0
info:
  title: GatePay API - Static Address Collection
  version: 1.0.0
servers:
  - url: https://openplatform.gateapi.io
security: []
paths:
  /merchant/open/v1/pay/fixedaddress/evm/save:
    post:
      tags:
        - Static Address Collection
      summary: Create EVM Chain Static Collection Address
      description: >-
        For the same customer, create a static collection address that can
        correspond to multiple networks, applicable only to EVM networks.


        **Note**: Under the same channelId, only one static collection address
        is allowed per network, and duplicate creation is not permitted.
      operationId: saveEvmFixedAddress
      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'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SaveEvmFixedAddressRequest'
            examples:
              default:
                value:
                  channelId: smart_shop
                  callbackUrl: https://www.abc.com/callback
                  chianCurrencyInfos:
                    - chain: ETH
                      currencies:
                        - DAI
                        - USDT
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SaveEvmFixedAddressResponse'
              examples:
                success:
                  value:
                    status: SUCCESS
                    code: '000000'
                    errorMessage: ''
                    data:
                      channelId: susie
                      address: '0xE74ac03A2d34A9cEce0A6547b1758C7A8fA10230'
                      callbackUrl: https://www.abc123.com/callback
                      chainInfos:
                        - chainShowEn: BSC/BEP20
                          currencies:
                            - USDT
components:
  parameters:
    X-GatePay-Certificate-ClientId:
      name: X-GatePay-Certificate-ClientId
      in: header
      required: true
      description: >-
        The clientId assigned when the merchant registers an application in the
        Gate merchant console.
      schema:
        type: string
        example: 4186d0c6-6a35-55a9-8dc6-5312769dbff8
    X-GatePay-Signature:
      name: X-GatePay-Signature
      in: header
      required: true
      description: >-
        Request signature. GatePay uses this signature to verify whether the
        request is valid.
      schema:
        type: string
    X-GatePay-Timestamp:
      name: X-GatePay-Timestamp
      in: header
      required: true
      description: >-
        UTC timestamp in milliseconds when the request is generated. GatePay
        will not process requests where the difference from the receive time
        exceeds 10 seconds.
      schema:
        type: string
        example: '1672905655498'
    X-GatePay-Nonce:
      name: X-GatePay-Nonce
      in: header
      required: true
      description: >-
        Random string. Must comply with HTTP header rules; recommended length is
        within 32 characters, composed of digits and letters.
      schema:
        type: string
        example: '9578'
  schemas:
    SaveEvmFixedAddressRequest:
      type: object
      required:
        - channelId
        - callbackUrl
        - chianCurrencyInfos
      properties:
        channelId:
          type: string
          description: >-
            Merchant channel ID, Only letters, numbers, underscores (_), and
            hyphens (-) are allowed. The maximum length is 50 bytes.
        callbackUrl:
          type: string
          description: >-
            Callback URL for collection notifications, The length must not
            exceed 128 bytes.
        chianCurrencyInfos:
          type: array
          items:
            $ref: '#/components/schemas/ChianCurrencyInfo'
          description: Network and currency information.
    SaveEvmFixedAddressResponse:
      type: object
      properties:
        status:
          type: string
          description: API response result, SUCCESS or FAIL.
          enum:
            - SUCCESS
            - FAIL
        code:
          type: string
          description: Response error code.
        errorMessage:
          type: string
          description: Error description.
        data:
          type: object
          properties:
            channelId:
              type: string
              description: Merchant channel ID
            address:
              type: string
              description: Collection address
            callbackUrl:
              type: string
              description: Callback URL for this channel
            chainInfos:
              type: array
              items:
                $ref: '#/components/schemas/ChainInfo'
              description: >-
                Includes the network and the currencies supported by the
                network.
    ChianCurrencyInfo:
      type: object
      required:
        - chain
      properties:
        chain:
          type: string
          description: >-
            Network name. Only EVM-compatible networks are supported. When
            creating a multi-network address, separate network names with
            commas. Supported EVM networks: ETH, MATIC, ARBEVM, BSC.
        currencies:
          type: array
          items:
            type: string
          description: >-
            The list of receivable currencies on the network. If not provided,
            all currencies supported on the network will be used by default.
    ChainInfo:
      type: object
      properties:
        chainShowEn:
          type: string
          description: The English name of network
        currencies:
          type: array
          items:
            type: string
          description: The list of receivable currencies on the network.

````