# unprice /pay/ping

> unprice /pay/ping is a paid API for AI agents from volkov.evgeny.m2.fvds.ru, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Health/liveness check endpoint that confirms the x402 pay-per-request gateway is reachable and that a USDC micropayment was successfully processed.

## Facts

- Endpoint: GET https://volkov.evgeny.m2.fvds.ru/pay/ping?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/unprice-pay-ping-7c67939c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jwX-4im6uGGLAPPYL5GEV

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 unprice-pay-ping-7c67939c
```

Example prompt: Ping the unprice x402 gateway to confirm it's live and that the USDC micropayment on Base was accepted — just do a quick health check and tell me if ok is true, the timestamp, and the payTo address.

## When to prefer this

Use this endpoint when you need to verify that the unprice x402 micropayment gateway is operational and that a USDC payment on Base was correctly received, before or after invoking other unprice pay-per-request APIs (fetch, IPFS, DNS, JSON). It is the lowest-cost ($0.001 USDC) liveness probe for the entire unprice service suite.

## Known failure modes

- Payment not included or insufficient USDC — gateway returns HTTP 402 Payment Required
- Network or server downtime — connection timeout or 5xx error
- Invalid or missing x402 payment header — 400 Bad Request
- USDC balance insufficient on Base — payment rejected before response
- Wrong network (not Base) — payment not recognized

## How this service works

Tiny paid web services for agents. Pay per request with USDC on Base via x402, plus non-x402 Base USDC tx-hash checkouts for Merchant Feed Audit, Base USDC receipts, and recent wallet statements.

## Output

A JSON object with three fields: 'ok' (boolean, true if the gateway is healthy), 'ts' (ISO 8601 timestamp of the response), 'paid' (boolean, true if the x402 micropayment was accepted), and 'payTo' (the Ethereum address on Base that received the USDC payment).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "ts": "2026-08-17T13:00:00.000Z",
  "paid": true,
  "payTo": "0xdD1729943bf7C408456cef52886ad12B05B57dC2"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/unprice-pay-ping-7c67939c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from volkov.evgeny.m2.fvds.ru](https://www.zero.xyz/host/volkov.evgeny.m2.fvds.ru/llms.txt)