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StableMerch UCP Checkout Complete
x402
StableMerch UCP Checkout Complete is a paid API for AI agents from stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app, paid per call via x402, $50/call, status unknown (last checked 2026-10-23).
Completes a StableMerch UCP checkout session by processing payment and sending the prepared Printify print order to production.
Price / call$50
Success—
StatusUnknown
How this service works
Pay for a StableMerch UCP checkout session and send its prepared Printify order to production. Requires checkout status ready_for_complete.
Output
Returns confirmation that the UCP checkout session has been paid and the associated Printify order has been sent to production, including updated checkout session status and order details.
Example use cases
Automated merch order fulfillment
“My StableMerch checkout session is ready — go ahead and pay for it and push the Printify order to production. The session ID is stablemerch:checkout:cmqirn2mj0000kz04468v0vks.”
Agent-driven custom merchandise purchase
“I've finished setting up my custom t-shirt order in StableMerch and the checkout session is in ready_for_complete status. Can you complete the payment and send it off to be printed?”
Programmatic print-on-demand order submission
“Submit and pay for the prepared Printify order tied to my StableMerch UCP checkout session — the session ID is stablemerch:checkout:cmqirn2mj0000kz04468v0vks and I want it sent to production immediately.”
Technical details
Endpoint
POSThttps://stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app/api/ucp/checkout-sessions/stablemerch%3Acheckout%3Acmqirn2mj0000kz04468v0vks/complete?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have a StableMerch UCP checkout session that has been fully prepared and is in ready_for_complete status, and you want to pay for it and trigger production of the Printify order in a single call. This is the final step in the StableMerch order flow.
Side effects
- Checkout session not in ready_for_complete status — returns error requiring session to be prepared first
- Invalid or missing session ID — returns validation error
- Payment failure or insufficient USDC — returns payment error
- Session ID not found — returns 404 or not-found error
- Duplicate completion attempt on already-completed session — returns conflict error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| id | string | UCP checkout session ID being completed. AgentCash clients may instead send checkout_session_id. |
| payment | — | |
| checkout_session_id | string | AgentCash checkout session ID being completed. UCP clients may instead send id. |
Tags
x402
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