Model Access Gateway – Gemini 3.1 Pro Chat Completions (x402, USDC)

x402

Model Access Gateway – Gemini 3.1 Pro 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-compatible chat completions against Google Gemini 3.1 Pro, billed per call in USDC on Base via x402 — no API key or account 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 (e.g. 'stop'), token usage breakdown (prompt, completion, total), model identifier ('google/gemini-3.1-pro'), and a unique completion ID. Streaming mode returns server-sent events instead.

Example use cases

Crypto-native agent reasoning step

“I need you to use Gemini 3.1 Pro to reason through this multi-step math word problem and show your work — pay per call using USDC so I don't have to sign up for anything.”

Structured JSON extraction from text

“Send this customer support ticket to Gemini 3.1 Pro and ask it to extract the issue category, urgency, and suggested resolution as JSON — use response_format JSON mode and keep max_tokens at 512.”

Streaming creative writing assistant

“Have Gemini 3.1 Pro write me the opening chapter of a sci-fi short story about a colony on Europa, streaming the output as it's generated, and charge my wallet in USDC for the call.”

Technical details

Endpoint

POSThttps://modelaccessgateway.com/llm/gemini-3.1-pro?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need Gemini 3.1 Pro specifically, want OpenAI-compatible request/response format, require no account or API key setup, and prefer crypto-native micropayments in USDC via x402 rather than monthly subscriptions. Ideal for autonomous agents that need to pay programmatically per inference call with automatic refund guarantees on failure.

Side effects

Model failure triggers automatic USDC refund to the caller's wallet
Invalid or missing messages array returns a 400 validation error
Payment insufficient or x402 handshake failure prevents inference from starting
max_tokens exceeding 16384 returns a schema validation error
Network timeout or model unavailability may return a 5xx error with no charge

Input

Schema · Request body

Field	Type	Description
model	string	Optional: fixed by the route (google/gemini-3.1-pro)
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": "google/gemini-3.1-pro",
    "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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