# RobotsShop x402 Trust Index — Monitor Subscribe

> RobotsShop x402 Trust Index — Monitor Subscribe is a paid API for AI agents from api.robotsshop.io, paid per call via x402, $10/call, status unknown (last checked 2026-09-15).

Registers a seller's x402 endpoint for daily monitoring and trust scoring by the RobotsShop Trust Index, returning a subscription ID and status.

## Facts

- Endpoint: POST https://api.robotsshop.io/v0/monitor/subscribe
- Price: $10/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/robotsshop-x402-trust-index-monitor-subscribe-06d905d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4SkdWJxGgNtH92vYH6Lch

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 robotsshop-x402-trust-index-monitor-subscribe-06d905d5 -d '<json body>'
```

Example prompt: Sign up my x402 endpoint at https://api.myservice.io/v1/data for daily monitoring on the RobotsShop Trust Index — it's a POST endpoint with a JSON body, and send alerts to https://hooks.myapp.com/robotsshop if anything fails.

## When to prefer this

Choose this endpoint when you want your x402-gated seller endpoint actively monitored and scored by the only directory that tests its own listings with real USDC purchases. Prefer this over generic uptime monitors when you specifically want x402 protocol compliance validated, trust scored, and listed in the RobotsShop Trust Index. Ideal for x402 API operators who want independent third-party verification that their payment-gated endpoints actually work end-to-end.

## Known failure modes

- Missing required 'url' field in body — returns validation error
- Invalid URL format — returns schema validation failure
- Unsupported HTTP method (not POST/PUT/PATCH) — returns enum validation error
- Invalid webhook URL format — returns URI validation error
- Payment not completed — x402 payment of $10 USDC required before subscription is activated
- Duplicate subscription for same URL — may return conflict or existing subscription
- Unreachable endpoint URL — monitoring may start but immediately flag as unreachable

## How this service works

We score x402 endpoints, then try to buy from every gated one with real USDC. The only directory that buys from its own listings. Live counts from /v0/stats.

## Output

Returns a JSON object confirming the subscription was created, including: ok (boolean), active (boolean), seller name, a unique sub_id (UUID), and the monitoring term in days (typically 30).

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "active": true,
  "seller": "RobotsShop",
  "sub_id": "uuid",
  "term_days": 30
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/robotsshop-x402-trust-index-monitor-subscribe-06d905d5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.robotsshop.io](https://www.zero.xyz/host/api.robotsshop.io/llms.txt)