# stall-row Recheck Pack Purchase

> stall-row Recheck Pack Purchase is a paid API for AI agents from stall-row-production.up.railway.app, paid per call via x402, $1/call, status unknown (last checked 2026-10-30).

Purchases a 250-credit monitoring pack for $1 USDC that enables discounted change-checks on a single endpoint over 90 days

## Facts

- Endpoint: POST https://stall-row-production.up.railway.app/v1/recheck/pack?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stall-row-recheck-pack-purchase-81c9c78a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kq-SX2y0UM20TftkSrURo

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 stall-row-recheck-pack-purchase-81c9c78a -d '<json body>'
```

Example prompt: Buy me a 250-check recheck pack for https://example.com/api/status so my monitoring loop can track changes there without paying per check each time.

## When to prefer this

Use this endpoint when a monitoring loop or scheduled agent needs to check the same URL repeatedly over time (dozens to hundreds of times) and you want a single upfront $1 payment at $0.004/check rather than paying $0.005 per individual check. Ideal for 90-day monitoring windows and automation workflows that would otherwise trigger hundreds of separate micro-payments.

## Known failure modes

- Payment failure or insufficient USDC balance — pack is not created and no pack_id is returned
- Invalid or missing URL in request body — likely 400 error
- Attempting to use a pack_id for a different URL than the one it was purchased for — credits not consumed or rejected
- Pack expiry after 90 days — remaining credits become invalid
- Network timeout during purchase — payment may be deducted without pack_id being returned, requiring manual support

## How this service works

Recheck watch pack: one $1.00 payment buys 250 change-checks for ONE endpoint ($0.004 per check instead of $0.005), good for 90 days. Pack credits persist across redeploys on the service volume. Returns an unguessable pack id — spend credits via POST /v1/recheck (body pack_id or X-Recheck-Pack header), and read the balance free at POST /v1/recheck/pack-balance. Use this when a monitoring loop checks the same endpoint on a schedule and wants one payment instead of hundreds.

## Output

Returns an unguessable pack_id string representing 250 prepaid change-check credits tied to one monitored URL, valid for 90 days. The pack_id can be passed as body field pack_id or X-Recheck-Pack header in subsequent POST /v1/recheck calls. Credit balance can be read for free at POST /v1/recheck/pack-balance. Credits persist across redeploys on the service volume.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stall-row-recheck-pack-purchase-81c9c78a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stall-row-production.up.railway.app](https://www.zero.xyz/host/stall-row-production.up.railway.app/llms.txt)