---
title: "Pay Payg"
method: GET
path: "/pay/payg"
---

# Pay Payg

`GET /pay/payg`

## Request

- Base URL: `https://mcp.physea.ai` (the document declares no server; this is the origin it was published from)
- URL: `https://mcp.physea.ai/pay/payg`
- Auth: none declared

Pay-as-you-go signup (metered solve subscription). Stripe Payment
Links do not support metered prices (Stripe 400, verified 2026-06-12), so
this endpoint mints a Checkout Session on demand and redirects the buyer to
it — the 402's static pay_url points HERE. Composio resolves its key via
env -> file -> the persistent Bitwarden session, all available to the gate
service.

W10 (AT35, brief §13): a FAILED pay-as-you-go checkout must NOT substitute a
monthly commitment. On failure this answers a coded ``LIM-PAY-001`` body (HTTP
503) that lists the explicit ``choices`` — retry PAYG, choose Monthly (only when
a monthly link is configured), or contact a human — and never redirects on the
customer's behalf. Never a 500, never a redirect loop back to this path.
``?choice=monthly`` is the customer's EXPLICIT selection and is the only way
this endpoint sends anyone to the monthly link.

## Response `200`

Successful Response

- unknown

---

[API](https://skmtc.dev/physea/apis/liminality-router-service.md) · [All operations](https://skmtc.dev/physea/apis/liminality-router-service/llms.txt) · [OpenAPI document](https://skmtc.dev/physea/apis/liminality-router-service/revisions/5f60ddd97544?raw)