OpenAI o4-mini Chat Completions (x402)

x402

OpenAI o4-mini Chat Completions (x402) 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).

Runs OpenAI o4-mini reasoning model chat completions with per-call USDC micropayment via x402 protocol, supporting adjustable reasoning effort and service tiers.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

o4-mini: OpenAI o4 Mini chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 0.55/2.2, Standard 1.1/4.4, Fast 2.0/8.0; pick with service_tier. Plus $0.0005 (Base) or $0.0005 (Solana) per call; the quote charges input plus 10% of max_tokens. Levels: low, medium, high, xhigh (model o4-mini:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing

Output

Returns a JSON chat completion object containing the assistant's reply message, finish reason (e.g. 'stop'), token usage breakdown (prompt, completion, total tokens), the model and service tier used, and a unique completion ID. Empty responses (no content) are billed at zero.

Example use cases

Complex reasoning on a budget

“I need to analyze this legal clause for potential ambiguities — use o4-mini at the xhigh reasoning level with the flex tier to keep costs low, and give me up to 2048 tokens of analysis.”

Automated coding assistant pipeline

“In my agent pipeline, call o4-mini:medium to review this Python function for bugs and suggest fixes — use the fast service tier so it responds quickly, max 512 tokens.”

Multi-turn tutoring session

“Walk me through solving this calculus problem step by step using o4-mini with high reasoning effort — I want detailed working, so allow up to 4096 output tokens on the standard tier.”

Technical details

Endpoint

POSThttps://openai.mm.family/x402/v1/models/o4-mini/chat/completions?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need OpenAI's o4-mini reasoning model with pay-per-call USDC micropayments (no subscription required), adjustable reasoning depth (low/medium/high/xhigh), and flexible cost-performance trade-offs via service tiers (flex is cheapest at $0.55/$2.2 per 1M tokens). Prefer over full o4 when cost efficiency matters and the task doesn't require maximum model capacity. Prefer over GPT-4o-class endpoints when structured multi-step reasoning is the priority.

Side effects

Insufficient USDC balance or x402 payment failure — returns 402 Payment Required
Invalid model enum value — returns 400 Bad Request
max_tokens exceeds model context limit — returns 400 or truncated response
Rate limiting on the chosen service tier — returns 429 Too Many Requests
Upstream OpenAI API error or timeout — returns 500 or 503

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": "o4-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": "flex"
  }
}

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