# NEXUS Agent Utilities – Ping

> NEXUS Agent Utilities – Ping is a paid API for AI agents from x402.nexusword.it, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-28).

Returns a simple liveness/health check response ({ok: true}) for autonomous agents, paid via x402 micro-payment

## Facts

- Endpoint: GET https://x402.nexusword.it/v1/ping?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexus-agent-utilities-ping-c5037c78
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h2M_dvzCb8Fy_5BCahYBW

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 nexus-agent-utilities-ping-c5037c78
```

Example prompt: Ping the NEXUS x402 utilities service to confirm it's live and that my agent can complete a micro-payment successfully — just return whether the service is up.

## When to prefer this

Use this endpoint when you need to verify that (1) the NEXUS x402 utilities service is online and (2) your agent's x402 micro-payment flow is functioning correctly before invoking more expensive or consequential endpoints. Prefer it over generic HTTP health checks when you specifically need to validate end-to-end x402 payment capability against a live paid endpoint.

## Known failure modes

- Payment rejected (402) — x402 payment token invalid or funds insufficient
- Service unavailable (503) — NEXUS backend is down
- Timeout — endpoint unreachable, network issue
- Invalid method — only GET is accepted; POST/PUT return 405
- Malformed payment header — x402 facilitator cannot process the payment metadata

## How this service works

x402-paid deterministic utilities for autonomous agents

## Output

Returns a JSON object with a single boolean field 'ok' set to true, confirming the service is live and the x402 payment was accepted. If an echo query parameter was supplied, the response may reflect it back.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "echo": {
       "type": "string"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexus-agent-utilities-ping-c5037c78/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.nexusword.it](https://www.zero.xyz/host/x402.nexusword.it/llms.txt)