# StableMerch Checkout Session Complete

> StableMerch 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 2026-10-21).

Completes a StableMerch UCP checkout session by processing payment and submitting the prepared Printify order to production.

## Facts

- Endpoint: POST https://stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app/api/ucp/checkout-sessions/stablemerch%3Acheckout%3Acmqiprmxe0000l504csr8ttju/complete?utm_source=zero.xyz
- Price: $50/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stablemerch-checkout-session-complete-edcda4fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ELGo_ro72FUlnzGiUh9pG

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability stablemerch-checkout-session-complete-edcda4fb -d '<json body>'
```

Example prompt: Complete my StableMerch checkout session 'stablemerch:checkout:cmqiprmxe0000l504csr8ttju' — it's ready for completion, so go ahead and pay and send the order to Printify production.

## When to prefer this

Use this endpoint when you have an existing StableMerch UCP checkout session in the ready_for_complete state and need to finalize payment and push the prepared Printify order to production. This is specifically for the StableMerch/UCP platform rather than direct Printify API calls or other print-on-demand services.

## Known failure modes

- Checkout session not in ready_for_complete status — order not yet prepared
- Invalid or missing checkout session ID — returns 400/422 error
- Payment failure or insufficient USDC balance — transaction not processed
- Session already completed — idempotency violation
- Printify production submission failure — order not forwarded

## 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

On success, returns confirmation that the checkout session has been completed, payment processed (50 USDC), and the Printify order has been sent to production for fulfillment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "id": {
   "type": "string",
   "minLength": 1,
   "description": "UCP checkout session ID being completed. AgentCash clients may instead send checkout_session_id."
  },
  "payment": {},
  "checkout_session_id": {
   "type": "string",
   "minLength": 1,
   "description": "AgentCash checkout session ID being completed. UCP clients may instead send id."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stablemerch-checkout-session-complete-edcda4fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app](https://www.zero.xyz/host/stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app/llms.txt)