OpenAI Multi-Model Chat Completions via mm.family (x402)

x402

OpenAI Multi-Model Chat Completions via mm.family (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).

Provides pay-per-call access to 25+ OpenAI chat models (GPT-4.1 through GPT-6.1-sol, o-series) via the x402 payment protocol, billed in USDC

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

gpt-6.1-sol (OpenAI's newest model) and 25 more OpenAI chat models (gpt-6, gpt-5.x, gpt-4.1, gpt-4o, o-series), paid per call in USDC. OpenAI token rates on Flex (half price, may answer 429; default where offered), Standard (service_tier default) or Fast (fast), plus $0.0005 (Base) or $0.0005 (Solana) per call; the quote charges input plus 10% of max_tokens. Empty answers are free. One endpoint per model: /x402/v1/models/<key>/chat/completions. Rates: https://openai.mm.family/x402/pricing

Output

Returns an OpenAI-compatible chat.completion JSON object including the assistant's message content, model used, finish reason, token usage (prompt, completion, total), and the service_tier that handled the request. Empty responses are not charged.

Example use cases

Agentic reasoning with latest GPT

“Use gpt-6.1-sol on the standard tier with up to 4000 tokens to reason through this multi-step problem for me: given these three business constraints, what is the optimal pricing strategy?”

Cheap bulk inference with flex pricing

“Run my list of customer support messages through gpt-5-nano on flex tier, max 500 tokens each, and draft a short reply for each one.”

Code generation with o-series model

“Ask o3 to write me a Python function that parses nested JSON and flattens it into a CSV — use the fast tier and give it up to 1500 tokens.”

Technical details

Endpoint

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

When to prefer

Choose this endpoint when you need pay-per-call access to OpenAI's latest and most capable models (GPT-6, GPT-5.x, o-series) without managing an OpenAI subscription, and want to pay in USDC via the x402 protocol. It is especially useful for agentic workflows that need on-demand LLM access billed per call, or when you want to experiment across a wide range of model tiers (nano to sol) and pricing tiers (flex/standard/fast) without committing to a fixed plan.

Side effects

429 Too Many Requests on flex tier (by design — flex may be throttled)
402 Payment Required if USDC payment via x402 is not attached or insufficient
Invalid model name returns 400 or unknown model error
max_tokens quota exceeded causes truncated or refused completion
Empty response returned (billed as free) if model produces no output

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-6-sol",
    "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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