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OpenAI GPT-5.4 Chat Completions (x402)
x402
OpenAI GPT-5.4 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 GPT-5.4 chat completions with up to 272K input tokens, billed per call in USDC via x402 protocol with configurable service tiers.
Price / call$0.001
Success—
StatusUnknown
How this service works
gpt-5.4: OpenAI GPT 5.4 (<=272K input tokens) chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 1.25/7.5, Standard 2.5/15.0, Fast 5.0/30.0; pick with service_tier. Plus $0.0005 (Base) or $0.0005 (Solana) per call; the quote charges input plus 10% of max_tokens. Levels: none, low, medium, high, xhigh (model gpt-5.4:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing
Output
Returns an OpenAI-compatible chat completion JSON object containing the assistant's reply text, role, finish reason (e.g. 'stop'), token usage counts (prompt, completion, total), the model name, the service tier used, and a unique completion ID.
Example use cases
On-demand AI reasoning with crypto billing
“I need to query GPT-5.4 with this prompt — 'Draft a professional apology email for a delayed shipment' — using the flex tier and cap the response at 500 tokens, and bill it to my USDC wallet via x402.”
High-throughput document summarization
“Summarize this 200,000-token legal document using GPT-5.4 with the fast service tier and a max of 2000 output tokens — I want the key clauses and obligations extracted.”
Structured JSON output from AI
“Call GPT-5.4 with the messages: system 'You are a data extractor', user 'Extract name, date, and amount from: Invoice #1234, John Doe, 2024-06-01, $450.00' — set response_format to JSON and use the standard tier with 256 max tokens.”
Technical details
Endpoint
POSThttps://openai.mm.family/x402/v1/models/gpt-5.4/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need GPT-5.4 quality responses (up to 272K input tokens) and want to pay per call in USDC without a traditional OpenAI API subscription. It is ideal for agents that handle variable or unpredictable inference loads, prefer crypto-native billing, or need to run in environments where x402 payment is the available protocol. Use gpt-5.4-long for contexts exceeding 272K tokens. Choose faster/cheaper siblings (gpt-5.4-nano, o4-mini) for cost-sensitive or simpler tasks.
Side effects
- Insufficient USDC balance causes payment failure before generation begins
- Exceeding 272K input token limit results in rejection — use gpt-5.4-long sibling instead
- Invalid model enum value (not in allowed list) returns a 400 error
- max_tokens set too high relative to available funds causes quote rejection
- Empty or malformed messages array returns a validation error
- Rate limits at the underlying OpenAI layer may cause 429 errors
- Streaming mode (stream:true) may not be supported by all x402 proxy clients
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-5.4",
"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"
}
}Tags
x402
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