OpenAI GPT-4.1 Mini Chat Completions (x402/USDC)

x402

OpenAI GPT-4.1 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).

Runs OpenAI GPT-4.1 Mini chat completions via an x402 pay-per-call USDC micropayment gateway, with configurable service tiers (standard/fast) and optional tool use.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

gpt-4.1-mini: OpenAI GPT 4.1 Mini chat completions, paid per call in USDC. Per 1M tokens in/out: Standard (default) 0.4/1.6, Fast 0.7/2.8; 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 chat completion object containing the assistant's reply message, finish reason (e.g. 'stop'), token usage counts (prompt, completion, total), a completion ID, the model name, and the service tier used. The response mirrors the OpenAI Chat Completions API format.

Example use cases

Agent reasoning step on a budget

“Have GPT-4.1 Mini decide which of these three options is best for my customer support case: escalate to human, send a refund, or send a templated reply — here's the case context: [customer complained about delayed shipment, order #4421]. Keep the response under 200 tokens and use the standard tier.”

Structured JSON extraction from text

“Use GPT-4.1 Mini to extract the name, date, and amount from this invoice text and return it as JSON: 'Invoice from Acme Corp, dated March 15 2025, total due $1,240.00'. Set max_tokens to 150 and use the fast service tier.”

Lightweight creative content generation

“Ask GPT-4.1 Mini to write a punchy 2-sentence product tagline for my new app called 'FocusFlow' — it's a Pomodoro timer for remote teams. Use the standard tier and cap it at 100 tokens.”

Technical details

Endpoint

POSThttps://openai.mm.family/x402/v1/models/gpt-4.1-mini/chat/completions?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need cost-effective GPT-4.1 Mini chat completions billed in USDC on a per-call basis via the x402 protocol — ideal for AI agents operating in crypto-native environments, or when you want fine-grained per-call spending control without a monthly subscription. Prefer this over gpt-4.1 or o3 endpoints on the same gateway when task complexity does not require a larger model, and over gpt-4.1-nano when you need slightly more capability at a modest price increase.

Side effects

Insufficient USDC balance or failed x402 payment — returns 402 Payment Required
Invalid or missing messages array — returns 400 Bad Request
max_tokens set too high relative to quote budget — may be rejected or truncated
Empty/trivial assistant response — billed as free (no charge for empty answers)
Rate limits or upstream OpenAI errors — may return 429 or 500
Unsupported service_tier value — rejected with validation error

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-4.1-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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