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StableMerch UCP Checkout Session Complete
x402
StableMerch UCP Checkout Session 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).
Pays for a StableMerch UCP checkout session and submits its prepared Printify order to production fulfillment.
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 a confirmation that the checkout session payment was processed (50 USDC) and the prepared Printify order has been submitted to production for fulfillment, along with order status details.
Example use cases
Finalize custom merch drop order
“My StableMerch checkout session for the hoodie order is ready to go — please pay the $50 USDC and push it to Printify production so it starts fulfillment.”
Automated agent merch order completion
“After the customer approved the design, the checkout session cmqiqvn3u0000l504km3kohjm is now ready_for_complete — go ahead and complete it by paying and sending the order to production.”
On-demand print order submission
“I've got a StableMerch UCP checkout session that's been approved and sitting at ready_for_complete status — please finalize it and get the Printify order into production now.”
Technical details
Endpoint
POSThttps://stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app/api/ucp/checkout-sessions/stablemerch%3Acheckout%3Acmqiqvn3u0000l504km3kohjm/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 need to pay for it and submit the Printify order to production in a single call. This is the final step in the StableMerch UCP checkout flow, not for creating or modifying orders.
Side effects
- Checkout session not in ready_for_complete status — returns an error indicating the session is not eligible for completion
- Invalid or expired checkout session ID — returns 404 or session-not-found error
- Insufficient USDC funds — payment fails and order is not submitted
- Printify order submission failure — payment may succeed but production submission fails
- Duplicate completion attempt — idempotency violation since the endpoint is not idempotent
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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