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

# Wallet Link Challenge

> Request a challenge nonce for wallet linking.

The user must sign this challenge message to prove ownership of the wallet.
Challenge expires in 5 minutes and can only be used once.

Rate limited: 5 challenges per hour per IP.



## OpenAPI

````yaml /openapi.json get /api/sdk/wallet/link/challenge
openapi: 3.1.0
info:
  title: Simmer API
  description: Agent-native trading infrastructure for prediction markets.
  version: 1.0.0
servers:
  - url: https://api.simmer.markets
security: []
paths:
  /api/sdk/wallet/link/challenge:
    get:
      tags:
        - sdk-wallet
      summary: Wallet Link Challenge
      description: >-
        Request a challenge nonce for wallet linking.


        The user must sign this challenge message to prove ownership of the
        wallet.

        Challenge expires in 5 minutes and can only be used once.


        Rate limited: 5 challenges per hour per IP.
      operationId: api_wallet_link_challenge_api_sdk_wallet_link_challenge_get
      parameters:
        - name: address
          in: query
          required: true
          schema:
            type: string
            title: Address
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/WalletLinkChallengeResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    WalletLinkChallengeResponse:
      properties:
        nonce:
          type: string
          title: Nonce
        message:
          type: string
          title: Message
        expires_at:
          type: string
          title: Expires At
        address:
          type: string
          title: Address
      type: object
      required:
        - nonce
        - message
        - expires_at
        - address
      title: WalletLinkChallengeResponse
      description: Response with challenge nonce for wallet linking.
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError

````