Model Access Gateway – GPT-5.5 Chat Completions (x402)

x402

Model Access Gateway – GPT-5.5 Chat Completions (x402) is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.0014/call, status unknown (last checked 2026-10-15).

Sends a chat completion request to GPT-5.5 via an OpenAI-compatible API, billed per-request in USDC on Base using x402 — no account or API key required.

Price / call$0.0014

Seller volume →—

Success—

StatusUnknown

How this service works

GPT-5.5 API (openai/gpt-5.5): LLM inference via OpenAI-compatible chat completions, pay per call in USDC on Base with x402. No API key, no account. Suited for AI agents and scripts that need GPT-5.5 on demand. When listed, this request cost 30% less than the same request on BlockRun. Streaming and function calling supported. Exact price in the 402 quote before payment; automatic refund if the model fails to answer.

Output

Returns an OpenAI-compatible chat.completion JSON object containing the assistant's message content, token usage breakdown (prompt, completion, total), finish reason, model identifier, and a completion ID.

Example use cases

Anonymous LLM call for agentic pipeline

“Send this support ticket text to GPT-5.5 and ask it to classify the issue category and urgency — pay per-call in USDC so our pipeline doesn't need a stored API key.”

One-off document drafting with crypto payment

“Have GPT-5.5 draft a short product description for our new wireless headphones — pay the per-request USDC fee automatically, I don't want to manage an OpenAI subscription.”

Serverless AI reasoning for a Web3 app

“I need you to call GPT-5.5 to reason through this on-chain transaction data and summarize what the wallet has been doing — use the x402 micropayment gateway so the dApp pays per inference with no backend credentials.”

Technical details

Endpoint

POSThttps://agent402-arb.rosariovitale0096.workers.dev/llm/gpt-5.5?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need GPT-5.5 chat completions without managing an OpenAI API key or subscription, and your agent or application can pay per-request in USDC via the x402 protocol on Base. Ideal for autonomous agents, Web3-native apps, or serverless pipelines where credential management is undesirable.

Side effects

Insufficient USDC balance — x402 payment fails, request rejected with 402 Payment Required
Invalid or malformed message body — returns 400 with schema validation error
Model unavailable or overloaded — returns 503 or timeout
Network failure to the Cloudflare Worker — connection timeout or 5xx
Token limit exceeded for the selected model — returns 400 or truncated response

Input

Schema · Request body

Field	Type	Description
model	string	Optional: fixed by the route (openai/gpt-5.5)
tools	array
stream	boolean	true: server-sent events after payment
messages	array
max_tokens	integer	Optional, default 4096
temperature	number
response_format	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "id": "chatcmpl-7f3c2a91",
    "model": "openai/gpt-5.5",
    "usage": {
      "total_tokens": 10,
      "prompt_tokens": 9,
      "completion_tokens": 1
    },
    "object": "chat.completion",
    "choices": [
      {
        "index": 0,
        "message": {
          "role": "assistant",
          "content": "OK"
        },
        "finish_reason": "stop"
      }
    ],
    "created": 1791979200
  }
}

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