Photon

Photon Newsletter API

First-party endpoint for adding newsletter signups to Ghost Members.

Documentation GitHub OpenAPI

Operations 1

POST /api/newsletter Create a newsletter signup #

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/photon-newsletter-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: Photon website Newsletter API
  summary: Public website API used by the Photon onboarding funnel and newsletter signup.
  description: Create or resume an onboarding session, save path-specific onboarding answers, submit a completed onboarding flow, and create Ghost newsletter signups. The companion onboarding schema endpoint returns the current path definitions, steps, and fields.
  version: '2026-05-13'
  contact:
    name: Photon Health
    url: https://photonhealth.com
servers:
- url: https://photonhealth.com
tags:
- name: Newsletter
  description: First-party endpoint for adding newsletter signups to Ghost Members.
paths:
  /api/newsletter:
    post:
      tags:
      - Newsletter
      operationId: createNewsletterSignup
      summary: Create a newsletter signup
      description: Accepts an email and optional name, then creates a free Ghost member for the Photon newsletter.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/NewsletterSignupRequest'
            example:
              email: ada@example.com
              name: Ada Lovelace
      responses:
        '200':
          description: The email already existed as a Ghost member and can be treated as signed up.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NewsletterSignupEnvelope'
        '201':
          description: Newsletter member created in Ghost.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NewsletterSignupEnvelope'
        '400':
          description: The submitted email or name is invalid.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FieldErrorEnvelope'
        '502':
          $ref: '#/components/responses/ErrorResponse'
        '503':
          $ref: '#/components/responses/ErrorResponse'
components:
  responses:
    ErrorResponse:
      description: Request failed.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
  schemas:
    ErrorEnvelope:
      type: object
      required:
      - error
      properties:
        error:
          type: string
    NewsletterSignupEnvelope:
      type: object
      required:
      - data
      properties:
        data:
          type: object
          required:
          - status
          - member
          properties:
            status:
              type: string
              enum:
              - created
              - already_exists
            member:
              $ref: '#/components/schemas/NewsletterMember'
    NewsletterSignupRequest:
      type: object
      required:
      - email
      additionalProperties: true
      properties:
        email:
          type: string
          format: email
        name:
          type: string
          maxLength: 191
          description: Optional member name to store in Ghost.
    FieldErrorEnvelope:
      type: object
      required:
      - error
      - errors
      properties:
        error:
          type: string
        errors:
          type: object
          additionalProperties:
            type: string
    NewsletterMember:
      type: object
      required:
      - email
      - subscribed
      - newsletters
      properties:
        id:
          anyOf:
          - type: string
          - type: 'null'
        uuid:
          anyOf:
          - type: string
          - type: 'null'
        email:
          type: string
          format: email
        name:
          anyOf:
          - type: string
          - type: 'null'
        subscribed:
          type: boolean
        newsletters:
          type: array
          items:
            type: object
            required:
            - id
            - name
            properties:
              id:
                anyOf:
                - type: string
                - type: 'null'
              name:
                type: string
  securitySchemes:
    leadTokenHeader:
      type: apiKey
      in: header
      name: x-onboarding-lead-token
    leadTokenCookie:
      type: apiKey
      in: cookie
      name: photon_onboarding_lead
externalDocs:
  description: Photon developer documentation
  url: https://docs.photon.health/docs