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

x402

Model Access Gateway – GPT-5.5 Chat Completions (x402 USDC) is a paid API for AI agents from modelaccessgateway.com, paid per call via x402, $0.0014/call, status unknown (last checked 2026-10-16).

Runs OpenAI GPT-5.5 chat completions via an OpenAI-compatible API, paid per-call in USDC on Base using the x402 protocol — no account or API key required.

Price / call$0.0014

Seller volume →—

Success—

StatusUnknown

How this service works

LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.

Output

Returns an OpenAI-compatible chat.completion JSON object containing the assistant's message content, finish reason, model used, and token usage (prompt, completion, total). On streaming, delivers server-sent events. If the model fails, an automatic USDC refund is issued.

Example use cases

Autonomous agent text generation

“I need my AI agent to draft a concise product description for a new wireless keyboard — use GPT-5.5, limit the response to 200 tokens, and have it pay per call in USDC so I don't need to manage API keys.”

Structured JSON output from GPT-5.5

“Send this customer complaint to GPT-5.5 and ask it to return a JSON object with fields for sentiment, urgency level, and suggested resolution — use response_format to enforce JSON and cap at 512 tokens.”

Tool-calling agent with GPT-5.5

“Run a GPT-5.5 chat session where the model can call a weather lookup tool I've defined — pass in the tool schema, set temperature to 0 for consistency, and stream the response back to me.”

Technical details

Endpoint

POSThttps://modelaccessgateway.com/llm/gpt-5.5?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need GPT-5.5 specifically, want OpenAI-compatible chat completions without managing an OpenAI account or API key, and can pay per-call in USDC via the x402 protocol. Ideal for autonomous AI agents that need anonymous, accountless LLM access with built-in payment and automatic refund on failure. Prefer this over direct OpenAI when operating in a crypto-native or x402-enabled environment.

Side effects

Model failure triggers automatic USDC refund — agent receives error response and payment is returned
Insufficient USDC balance causes x402 payment rejection before inference begins
Invalid or missing messages array returns a 400-level validation error
max_tokens exceeding 16384 is rejected at schema validation
Streaming requested but client doesn't handle SSE — incomplete response received

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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