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x402engine OpenAI o1 LLM API
x402
x402engine OpenAI o1 LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.10437/call, status unknown (last checked 2026-10-16).
Runs inference on OpenAI's o1 reasoning model via a pay-per-call HTTP 402 micropayment endpoint, returning an OpenAI-compatible chat completion response.
Price / call$0.10437
Success—
StatusUnknown
How this service works
x402engine — OpenAI's reasoning model — excels at math, science, coding, and multi-step problem solving
Output
Returns an OpenAI-compatible JSON chat completion object containing an array of choices, each with an assistant message (role, content, optional tool_calls), a finish_reason, and the model name (openai/o1). Also includes a top-level content shortcut field with the assistant's text response.
Example use cases
Complex multi-step reasoning task
“I need o1 to work through this algorithm design problem: given a list of N integers, find the maximum subarray sum in O(n log n) time — walk me through the approach and write pseudocode.”
Agent tool-calling with o1 backbone
“Use the o1 model as my reasoning backbone — give it these tool definitions for web search and calculator, and ask it to figure out how much compound interest I'd earn on $5,000 at 4.5% over 10 years.”
PDF document analysis with o1
“Parse this PDF research paper and then use o1 to summarize the key findings, methodology, and conclusions in plain English for a non-technical audience.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/o1?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need OpenAI's o1 reasoning model specifically — known for strong chain-of-thought, math, coding, and logic tasks — without managing an OpenAI API subscription. Ideal for AI agents that pay per call using USDC on Base, USDm on MegaETH, or USDC on Solana via HTTP 402. Prefer over other LLM endpoints when the task benefits from o1's extended reasoning capabilities rather than speed-optimized models.
Side effects
- Insufficient USDC/crypto balance causes 402 payment failure with no completion returned
- Messages array missing or malformed causes 400 validation error
- Model context window exceeded if messages are too long
- Tool call format mismatch causes incomplete or errored tool_calls in response
- Stream mode may time out if reasoning takes very long
- Unsupported seed value for o1 may be silently ignored
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "openai/o1",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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