OpenAI GPT-4o Mini Chat Completions (x402/USDC)

x402

OpenAI GPT-4o Mini Chat Completions (x402/USDC) is a paid API for AI agents from openai.mm.family, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Send a chat conversation to GPT-4o-mini and receive an AI-generated text response, billed per call in USDC via x402 micropayments.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

gpt-4o-mini: OpenAI GPT 4o Mini chat completions, paid per call in USDC. Per 1M tokens in/out: Standard (default) 0.15/0.6, Fast 0.25/1.0; pick with service_tier. Plus $0.0005 (Base) or $0.0005 (Solana) per call; the quote charges input plus 10% of max_tokens. Empty answers are free. Rates: https://openai.mm.family/x402/pricing

Output

Returns a JSON object containing the assistant's reply message, the finish reason (e.g. 'stop'), prompt and completion token counts, the model name ('gpt-4o-mini'), and the service_tier used. The choices array holds the generated text under choices[0].message.content.

Example use cases

Automated customer support drafting

“Use GPT-4o-mini to draft a polite reply to this customer complaint: 'My order arrived damaged and the packaging was torn.' Keep it under 100 words and use the standard service tier.”

Rapid content classification pipeline

“I need GPT-4o-mini to classify the following product review as positive, negative, or neutral — here's the text: 'Battery life is excellent but the screen is too dim.' Use the fast service tier and limit the response to 50 tokens.”

Code explanation for developer tool

“Send this Python snippet to GPT-4o-mini and ask it to explain what it does in plain English, max 150 tokens, standard tier: 'def fib(n): return n if n <= 1 else fib(n-1) + fib(n-2)'”

Technical details

Endpoint

POSThttps://openai.mm.family/x402/v1/models/gpt-4o-mini/chat/completions?utm_source=zero.xyz

When to prefer

Choose GPT-4o-mini over GPT-4o when you need low-cost, high-throughput text generation and the task doesn't require advanced reasoning or long context. It is the best fit for classification, summarization, drafting, and extraction tasks where cost per call matters. Prefer this over the standard OpenAI API when you want to pay per call in USDC via x402 without a monthly subscription, or when building agentic pipelines that need autonomous micropayment-based LLM access.

Side effects

Insufficient USDC balance or x402 payment failure — call returns 402 Payment Required
max_tokens set too low causing truncated or empty response (empty answers are free)
Invalid message format (missing role or content fields) — returns 400 Bad Request
Model overload on fast/priority tier — may return 429 or degrade to slower tier
Malformed response_format object causing 400 error
Streaming not supported in all client configurations — stream:true may cause parse errors

Input

Schema · Request body

Field	Type	Description
model	string
tools	array
stream	boolean
messages	array
max_tokens	integer
service_tier	string
response_format	object
reasoning_effort	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "id": "chatcmpl-x",
    "model": "gpt-4o-mini",
    "usage": {
      "total_tokens": 9,
      "prompt_tokens": 8,
      "completion_tokens": 1
    },
    "object": "chat.completion",
    "choices": [
      {
        "index": 0,
        "message": {
          "role": "assistant",
          "content": "Hello",
          "refusal": null
        },
        "finish_reason": "stop"
      }
    ],
    "service_tier": "default"
  }
}

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