---
title: "Upgrade Subscription"
method: POST
path: "/v1/subscription/upgrade"
---

# Upgrade Subscription

`POST /v1/subscription/upgrade`

Self-service upgrade to paid tier (pay-as-you-go)

If user already has payment method on file (from previous paid subscription),
upgrades immediately without re-entering card details.

If no payment method exists, creates Stripe Checkout Session to collect it.
No upfront charge - users are billed monthly for actual token usage.

## Response `200`

Successful Response

- unknown

---

[API](https://skmtc.dev/ctgt/apis/ctgt-api.md) · [All operations](https://skmtc.dev/ctgt/apis/ctgt-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/ctgt/ctgt-api/revisions/7700e5b2270f/schema)