# Delx Commerce Live Probe — x402 Endpoint Liveness Check

> Delx Commerce Live Probe — x402 Endpoint Liveness Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Probes a single x402-enabled HTTPS endpoint to confirm it is live and returns a 402 payment-required response, without sending any payment.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/live-probe?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-live-probe-x402-endpoint-liveness-check-cb0e749f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r4Z0HeZjZAWj6djA4U87n

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 delx-commerce-live-probe-x402-endpoint-liveness-check-cb0e749f -d '<json body>'
```

Example prompt: Can you probe https://api.example-x402.com/pay to check if it's a live x402 endpoint — tag the observation as 'weather-api' — without sending any payment?

## When to prefer this

Use this endpoint when you need to verify that a specific x402-compliant URL is live and correctly configured before integrating it into a payment workflow, or when you want a verifiable, timestamped observation receipt of a liveness check without risking any funds. Prefer this over general HTTP ping tools when the x402 protocol handshake itself (the 402 response) is what needs to be confirmed.

## Known failure modes

- Target URL is not reachable — endpoint may be down or misconfigured, latency_ms may be high or absent
- Target URL does not return 402 — endpoint may not support x402, http_status will reflect the actual response code
- URL is malformed or too short (under 12 characters) — request will be rejected with a validation error
- URL exceeds 2048 characters — request rejected due to maxLength constraint
- Network timeout on probe — receipt_id may be zeroed and latency_ms unusually high

## How this service works

Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.

## Output

A JSON object confirming whether the target URL returned an HTTP 402 status (indicating active x402 support), along with round-trip latency in milliseconds, a verifiable receipt ID, the observation timestamp, and a 'paid: false' flag confirming no payment was made during the probe.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 12,
   "description": "Single https x402 endpoint to handshake. One URL per call; no payment is sent."
  },
  "capability": {
   "type": "string",
   "maxLength": 120,
   "minLength": 1,
   "description": "Optional capability tag stored on the observation receipt for later directory queries."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://api.example-x402.test/pay",
  "kind": "x402_live_probe",
  "paid": false,
  "latency_ms": 42,
  "receipt_id": "0000000000000000000000000000000000000000000000000000000000000000",
  "http_status": 402,
  "observed_at": "2026-08-14T19:00:00+00:00"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-live-probe-x402-endpoint-liveness-check-cb0e749f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)