# GPT-5.5 True Max-Output Paid Chat (x402 USDC, GET)

> GPT-5.5 True Max-Output Paid Chat (x402 USDC, GET) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.523889/call, status unknown (last checked 2026-09-14).

Generates long-form GPT-5.5 chat completions via a GET endpoint with up to 128,000 output tokens, paid per-request in USDC over the x402 protocol on Base.

## Facts

- Endpoint: GET https://gpt55.558686.xyz/v1/paid/chat-max
- Price: $0.523889/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-true-max-output-paid-chat-x402-usdc-get-75863756
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d5DHVJiGIO8Oibpsz33ny

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-true-max-output-paid-chat-x402-usdc-get-75863756
```

Example prompt: Using the max-output GPT-5.5 gateway, write me a comprehensive 50-page technical architecture document for a distributed microservices system — use the prompt 'Design a full distributed microservices architecture with security, scalability, and observability' and allow up to 128000 output tokens.

## When to prefer this

Choose this endpoint when you need the absolute maximum output length from GPT-5.5 (up to 128,000 tokens) for long-form generation tasks such as large documents, detailed reports, or multi-step agent responses, and you are paying via x402 USDC on Base. Prefer this over the compact or long-output tiers when output length is the priority and cost per call up to $0.066667 is acceptable.

## Known failure modes

- Payment insufficient or missing — x402 payment header not provided or below $0.066667 cap
- Prompt exceeds 700,000 input character limit — request rejected
- max_tokens value out of range (must be 1–128,000) — validation error
- Upstream GPT-5.5 model unavailable or rate-limited — 503 or gateway error
- Malformed query parameters — missing required 'q', 'prompt', or 'message' field returns error

## How this service works

OpenAI-compatible GPT-5.5 true max-output paid chat over x402 Base USDC. Directory-friendly GET endpoint for long-form generation, large agent responses, and max-output GPT-5.5 chat completions. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call, while this gateway advertises a $0.110876 compact GPT-5.5 entry request, $0.110876 long-output GPT-5.5 requests, and $0.523889 true max-output GPT-5.5 requests. Pay up to $0.523889 per request with x402 USDC on Base. Exact fixed-price payment and upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Public paid calls are limited to 700000 input characters and 128000 output tokens.

## Output

An OpenAI-compatible chat completion JSON object containing a completion ID, model name, an array of choices with the generated message content, and a usage object showing prompt tokens, completion tokens, and total tokens consumed.

## 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": {
      "q": {
       "type": "string"
      },
      "prompt": {
       "type": "string"
      },
      "system": {
       "type": "string"
      },
      "message": {
       "type": "string"
      },
      "max_tokens": {
       "type": "integer",
       "maximum": 128000,
       "minimum": 1
      }
     },
     "additionalProperties": true
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "id",
      "object",
      "model",
      "choices"
     ],
     "properties": {
      "id": {
       "type": "string"
      },
      "model": {
       "type": "string"
      },
      "usage": {
       "type": "object"
      },
      "object": {
       "type": "string"
      },
      "choices": {
       "type": "array"
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-5-true-max-output-paid-chat-x402-usdc-get-75863756/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)