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

x402

OpenAI GPT-4.1 Nano 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 GPT-4.1 Nano chat completions via a pay-per-call x402 USDC micropayment gateway, billed at $0.10/$0.40 per 1M tokens in/out (standard tier)

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

gpt-4.1-nano: OpenAI GPT 4.1 Nano chat completions, paid per call in USDC. Per 1M tokens in/out: Standard (default) 0.1/0.4, Fast 0.2/0.8; 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 text, token usage breakdown (prompt, completion, total tokens), finish reason (e.g. 'stop'), model name, service tier used, and a unique completion ID.

Example use cases

Cheap classification for high-volume pipelines

“Classify each of these 50 product reviews as positive, negative, or neutral using GPT-4.1 Nano on the standard tier — I want the cheapest model that can handle it, paying per call in USDC.”

Fast Q&A bot for a lightweight assistant

“Answer this user question in 2 sentences using GPT-4.1 Nano on the fast service tier, keep max_tokens at 150: 'What are the main differences between supervised and unsupervised learning?'”

Automated code comment generation

“Use the nano GPT-4.1 model to generate a concise docstring for this Python function, standard tier, max 100 tokens: 'def calculate_discount(price, pct): return price * (1 - pct / 100)'”

Technical details

Endpoint

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

When to prefer

Choose this endpoint when you need the lowest-cost OpenAI chat model with per-call USDC micropayment billing via x402, particularly for high-volume, short-context tasks like classification, summarization, or Q&A where GPT-4.1 Nano's smaller size is sufficient. Prefer this over sibling endpoints (gpt-4o, gpt-5) when budget is the primary constraint and task complexity is low. Use the 'fast' service tier when latency matters more than cost.

Side effects

Payment failure if USDC balance is insufficient for the quoted call cost
Context length exceeded if messages plus max_tokens surpasses model limits
Empty/null response returned if the model produces no content (charged $0)
Invalid service_tier enum value returns a 400 error
Malformed messages array (missing role or content) causes a validation error
Rate limiting or capacity errors under high load

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-nano",
    "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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