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

# Email a sign-in link to a signing portal

> Public.

Emails a link, valid for 30 minutes, that opens every document the project sent the address.

Answers the same whether or not the address has any, so it reveals nothing.



## OpenAPI

````yaml post /signature/guest/projects/{projectId}/sign-in-link
openapi: 3.1.0
info:
  title: HERO API
  version: current
  description: |-
    The HERO REST API.

    See https://developers.myhero.so for the rendered docs.
servers:
  - url: https://app.myhero.so
security: []
paths:
  /signature/guest/projects/{projectId}/sign-in-link:
    post:
      tags:
        - Signatures
      summary: Email a sign-in link to a signing portal
      description: >-
        Public.


        Emails a link, valid for 30 minutes, that opens every document the
        project sent the address.


        Answers the same whether or not the address has any, so it reveals
        nothing.
      operationId: requestSignatureSignInLink
      parameters:
        - schema:
            type: string
            minLength: 1
          required: true
          name: projectId
          in: path
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                email:
                  type: string
                  minLength: 3
                  maxLength: 320
              required:
                - email
      responses:
        '200':
          description: 200 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      sent:
                        type: boolean
                        enum:
                          - true
                    required:
                      - sent
                required:
                  - data
      security: []

````

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