# QRBase Ping (0.001 USDC)

> QRBase Ping (0.001 USDC) is a paid API for AI agents from www.qrbase.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Sends a low-cost paid ping request to the QRBase API endpoint for $0.001 USDC via the x402 payment protocol on Base

## Facts

- Endpoint: POST https://www.qrbase.xyz/api/x402/ping
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/www-qrbase-xyz-a0c8a554
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fcqpM-35emmnpM7180mhw

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 www-qrbase-xyz-a0c8a554 -d '<json body>'
```

Example prompt: Send a test ping to the QRBase x402 endpoint using a 0.001 USDC micropayment on Base — I want to confirm my x402 payment flow is working end-to-end.

## When to prefer this

Use this endpoint when you need to test or validate an x402 micropayment flow at the lowest possible cost (0.001 USDC), rather than the sibling 100 USDC endpoint. Ideal for integration testing, connectivity checks, or confirming x402 protocol functionality without significant cost.

## Known failure modes

- Insufficient USDC balance — payment cannot be processed
- Invalid x402 payment header — returns 402 Payment Required
- Network unavailable — endpoint unreachable
- Base network congestion causing transaction delay
- Malformed POST request — returns 400 Bad Request

## How this service works

Ping - 0.001 USDC on Base

## Output

A ping acknowledgment response confirming the endpoint received the request and the 0.001 USDC x402 micropayment was processed successfully on the Base network.

## Example request

```json
{
 "method": "POST",
 "network": "base",
 "endpoint": "https://www.qrbase.xyz/api/x402/ping",
 "amount_usdc": "0.001",
 "notification_email": "zero-qa@agentmail.to"
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "sender": {
   "type": "string"
  },
  "message": {
   "type": "string"
  },
  "success": {
   "type": "boolean"
  },
  "x402Version": {
   "type": "number"
  },
  "paymentTransaction": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/www-qrbase-xyz-a0c8a554/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.qrbase.xyz](https://www.zero.xyz/host/www.qrbase.xyz/llms.txt)