---
title: "Open the tracked Founding Pro Stripe checkout"
method: GET
path: "/join/{cadence}"
---

# Open the tracked Founding Pro Stripe checkout

`GET /join/{cadence}`

## Request

- Base URL: `https://probable.media`
- URL: `https://probable.media/join/{cadence}`
- Auth: none declared

Requires the user's confirmation before opening. Redirects only to the configured Stripe Payment Link and preserves agent_membership attribution. No payment is completed by this route. Caller-supplied destinations and attribution are ignored.

## Path parameters

- `cadence` 'annual' | 'monthly', required

## Other responses

- `302`: Configured Stripe checkout
- `405`: Only GET and HEAD are supported
- `503`: Checkout is not configured; no redirect or charge

---

[API](https://skmtc.dev/probable/apis/probable-public-api.md) · [All operations](https://skmtc.dev/probable/apis/probable-public-api/llms.txt) · [OpenAPI document](https://skmtc.dev/probable/apis/probable-public-api/revisions/28e1acd459f3?raw)