# alest.io x402 Ping Test Endpoint

> alest.io x402 Ping Test Endpoint is a paid API for AI agents from alest-x402.alest.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-30).

Returns a signed JSON confirmation of a micropayment, enabling agents to verify x402 payment flows on Base testnet.

## Facts

- Endpoint: GET https://alest-x402.alest.workers.dev/v1/ping?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/alest-io-x402-ping-test-endpoint-37e290f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tQggejFm6iMmA1VEr_qDd

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 alest-io-x402-ping-test-endpoint-37e290f6
```

Example prompt: Can you ping the alest.io x402 test endpoint to confirm my agent's USDC micropayment on Base is working correctly?

## When to prefer this

Use this endpoint specifically to test and validate x402 micropayment flows for AI agents operating on Base. It is the canonical developer smoke-test for confirming that an agent wallet, USDC balance, and x402 payment protocol are correctly configured before calling production paid endpoints. Not useful for any data retrieval or computation beyond payment confirmation.

## Known failure modes

- Payment not included or malformed x402 header — endpoint returns 402 Payment Required
- Insufficient USDC balance — payment rejected before endpoint responds
- Network or Cloudflare Worker downtime — 502/503 response
- Wrong chain or facilitator — payment not recognized, returns error JSON
- Malformed GET request — returns 400 Bad Request

## How this service works

alest.io x402 test endpoint. Returns a signed-off JSON confirming the payment. Useful to test agent payments on Base.

## Output

A signed JSON object confirming that the $0.01 USDC x402 payment was received and processed on Base, serving as a verifiable receipt of the micropayment transaction.

## 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/alest-io-x402-ping-test-endpoint-37e290f6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alest-x402.alest.workers.dev](https://www.zero.xyz/host/alest-x402.alest.workers.dev/llms.txt)