# GPT-5.5 Gateway x402 Ping

> GPT-5.5 Gateway x402 Ping is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.0001/call, status unknown (last checked 2026-09-14).

Settles a minimal x402 micropayment and returns service metadata confirming the GPT-5.5 gateway is live, without invoking the upstream model.

## Facts

- Endpoint: GET https://gpt55.558686.xyz/v1/x402-ping
- Price: $0.0001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-5-5-gateway-x402-ping-7f50f08a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b61Mv9hcfZcpGDyW3Ahzm

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 gpt-5-5-gateway-x402-ping-7f50f08a
```

Example prompt: Can you ping the GPT-5.5 gateway at gpt55.558686.xyz to verify that x402 payment settlement is working and get back the service metadata — I just want confirmation the gateway is live without running a full model call.

## When to prefer this

Use this endpoint when you need a cheap, fast proof-of-life check on the GPT-5.5 x402 gateway before committing to a full model inference call. Ideal for wallets, crawlers, and agents that want to verify x402 payment settlement is working without burning tokens on actual LLM inference. Prefer this over the model inference endpoints when you only need service metadata or payment confirmation.

## Known failure modes

- x402 payment rejected — insufficient USDC balance or invalid payment header returns 402 Payment Required
- Gateway unreachable — network timeout or DNS failure
- Invalid method — POST or other non-GET methods rejected
- Payment amount too low — less than $0.001 USDC triggers payment failure
- Service metadata unavailable — gateway misconfiguration may return empty or malformed response

## How this service works

Paid x402 capability check for this GPT-5.6 Luna gateway. GET version for agents, crawlers, and wallets that prefer a simple no-body settlement proof. This endpoint settles a small x402 payment and returns service metadata without calling the upstream model.

## Output

Returns a JSON object with: ok (boolean indicating success), paid (boolean confirming x402 payment settled), model (string identifier of the upstream model), and service (string name of the gateway service). Does not invoke the upstream AI model.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "additionalProperties": true
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "service",
      "model"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "model": {
       "type": "string"
      },
      "service": {
       "type": "string"
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-5-gateway-x402-ping-7f50f08a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)