# x402-testbed Ping

> x402-testbed Ping is a paid API for AI agents from health-api.tail11a58f.ts.net, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Minimal paid x402 test endpoint that returns pong, network, and server time to validate the full USDC micropayment round-trip.

## Facts

- Endpoint: GET https://health-api.tail11a58f.ts.net/ping?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-testbed-ping-54c3e565
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_isG4UDn_Mxn0fJCFsdeGV

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 x402-testbed-ping-54c3e565
```

Example prompt: Send a test ping to the x402 testbed endpoint so I can confirm my USDC payment client correctly handles the full challenge-sign-settle round-trip before I wire it up to a real paid API.

## When to prefer this

Choose this endpoint when you need to validate an x402 micropayment client implementation end-to-end — including challenge parsing, USDC signing, and facilitator settlement — before connecting to a real paid API. It is the lowest-cost ($0.001 USDC) and lowest-risk way to prove the full payment stack works. Prefer it over production APIs during development, CI pipelines, or debugging payment failures.

## Known failure modes

- Payment challenge not handled: client returns 402 without completing the payment flow
- Invalid USDC signature: facilitator rejects the payment and returns an error
- Facilitator settlement timeout: payment submitted but not confirmed in time
- Network mismatch: USDC sent on wrong chain rejected by facilitator
- Insufficient USDC balance: wallet cannot cover the $0.001 micropayment

## How this service works

x402 test endpoint — live x402 test endpoint for testing an x402 client: the smallest possible paid round-trip that proves challenge parsing, USDC signing, facilitator settlement and retry. Use it to test x402 payments end to end before pointing a client at a real paid API. Returns pong + network + server time. No API key.

## Output

Returns a JSON object containing a pong acknowledgement, the network identifier, and the current server timestamp — confirming that the full x402 paid round-trip (challenge parsing, USDC signing, facilitator settlement, and retry) completed successfully.

## 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": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-testbed-ping-54c3e565/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from health-api.tail11a58f.ts.net](https://www.zero.xyz/host/health-api.tail11a58f.ts.net/llms.txt)