# x402-gateway Paid Ping

> x402-gateway Paid Ping is a paid API for AI agents from x402-gateway.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Test the x402 payment flow end-to-end by making a paid HTTP GET ping request costing $0.001 USDC

## Facts

- Endpoint: GET https://x402-gateway.ai/api/v1/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/x402-gateway-paid-ping-338d692b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_45zwaa4CuetnbiSnNoDyc

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-gateway-paid-ping-338d692b
```

Example prompt: Send a paid ping through the x402 gateway to confirm my micropayment flow is working end-to-end — it should charge $0.001 USDC and come back with a success response.

## When to prefer this

Choose this endpoint when you need to verify that an x402 payment flow is working end-to-end with a minimal, low-cost ($0.001 USDC) real transaction. Ideal for smoke testing wallet configuration, x402 header construction, and facilitator connectivity before invoking more expensive paid endpoints. Not suitable for any actual data retrieval or production workload — purely a diagnostic/test primitive.

## Known failure modes

- Insufficient USDC balance — payment rejected, 402 Payment Required returned without fulfillment
- Malformed x402 payment header — gateway rejects with 400 Bad Request
- Facilitator unavailable — timeout or 503 from the payment processing layer
- Network unreachable — connection timeout to x402-gateway.ai
- x402 protocol version mismatch — gateway returns error indicating unsupported payment scheme

## How this service works

Paid ping — test the x402 payment flow end-to-end. Returns pong. Costs $0.001, exists so agents can verify their x402 wallet setup against this gateway cheaply.

## Output

Returns an HTTP response confirming the ping succeeded and the $0.001 USDC x402 payment was accepted. Typically a simple success payload (e.g. pong or status OK) alongside any payment receipt metadata the x402 protocol surfaces.

## 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
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-gateway-paid-ping-338d692b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-gateway.ai](https://www.zero.xyz/host/x402-gateway.ai/llms.txt)