# Losbeto /ping402 Liveness Check

> Losbeto /ping402 Liveness Check is a paid API for AI agents from api.losbeto.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-23).

Returns a signed liveness receipt confirming the full x402 payment loop (402 challenge → wallet signature → settlement → delivery) is operational, plus node version and a catalog map.

## Facts

- Endpoint: GET https://api.losbeto.xyz/ping402?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/losbeto-ping402-liveness-check-8570dcb3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6Wkdzj4VetIDLAi2DXkwS

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 losbeto-ping402-liveness-check-8570dcb3
```

Example prompt: Run the cheapest Losbeto ping call — just $0.001 in USDC — so I can confirm the x402 payment loop, wallet signature, and settlement all work correctly before I make any real market data calls.

## When to prefer this

Choose this endpoint when you need the absolute cheapest ($0.001) way to validate that the full x402 micropayment loop — challenge, signature, facilitator settlement, and JSON delivery — is functional before investing in more expensive Losbeto calls like LLM inference ($0.005) or market data. Prefer this over generic HTTP health checks when you specifically need to prove end-to-end payment flow, not just TCP reachability.

## Known failure modes

- Insufficient USDC balance — payment settlement fails with 402 not resolved
- Wrong network — wallet on unsupported chain (not Base, Polygon, Solana, or Algorand)
- Facilitator timeout — 402 challenge issued but settlement confirmation not received in time
- Node downtime — endpoint returns 5xx if Losbeto node is offline
- Invalid wallet signature — 402 challenge response rejected by facilitator

## How this service works

x402 hello-world: the cheapest live call on this node ($0.001), built for agents to smoke-test the full payment loop — 402 challenge, wallet signature, facilitator settlement, JSON delivery — against a real merchant....

## Output

A signed JSON liveness receipt confirming the node is operational, the current node version string, and a structured map pointing to the free trial endpoint and the full paid catalog of Losbeto services. No upstream data calls are made; this is a pure local health-check response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "format": {
       "type": "string",
       "description": "Response format (json)"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "type": "object",
     "description": "x402 hello-world: the cheapest live call on this node ($0.001), built for agents to smoke-test the full payment loop — 402 challenge, wallet signature, facilitator settlement, JSON delivery — against a real merchant. Returns a signed liveness receipt, the node version and a map to the free trial and the full catalog. Zero upstream calls."
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/losbeto-ping402-liveness-check-8570dcb3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.losbeto.xyz](https://www.zero.xyz/host/api.losbeto.xyz/llms.txt)