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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 2026-09-13).
Completes a ready-for-complete StableMerch UCP checkout session by processing a $50 USDC payment and submitting the prepared Printify 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 a confirmation that the checkout session has been completed, payment of $50 USDC has been processed, and the associated Printify order has been submitted to production for fulfillment.
Example use cases
Fulfilling a custom merch drop
“I've got a StableMerch checkout session stablemerch:checkout:cmqimhb4t0000jv04tulgnnqp that's ready for completion — please pay with USDC and push the Printify order to production so we can start fulfillment.”
Automating agent-driven merchandise orders
“My AI storefront just prepared a StableMerch checkout for a customer's hoodie order and the session ID is stablemerch:checkout:cmqimhb4t0000jv04tulgnnqp — complete it now and get it into the print queue.”
One-click creator merch production
“I finished setting up my merch design on StableMerch and session stablemerch:checkout:cmqimhb4t0000jv04tulgnnqp is showing ready_for_complete — can you pay the 50 USDC and send it off to Printify?”
Technical details
Endpoint
POSThttps://stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app/api/ucp/checkout-sessions/stablemerch%3Acheckout%3Acmqimhb4t0000jv04tulgnnqp/completeWhen to prefer
Use this endpoint when a StableMerch UCP checkout session has been fully prepared and its status is exactly ready_for_complete, and you need to atomically process the $50 USDC payment and push the Printify order into production in a single call. This is the final step in the StableMerch order workflow, not for creating or modifying sessions.
Side effects
- Checkout session not in ready_for_complete status — returns an error if the session is still pending or already completed
- Invalid or unknown checkout session ID — returns a 404 or similar not-found error
- Insufficient USDC balance — payment fails and order is not submitted
- Payment protocol (x402) failure — transaction rejected or timed out
- Printify order submission failure — payment may succeed but order production not triggered
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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