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x402engine GPT-5.2 Pro LLM API
x402
x402engine GPT-5.2 Pro LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.145674/call, status unknown (last checked 2026-10-12).
Calls OpenAI GPT-5.2 Pro via a pay-per-call HTTP 402 micropayment endpoint, returning an OpenAI-compatible chat completion response
Price / call$0.145674
Success—
StatusUnknown
How this service works
125 production APIs behind HTTP 402 micropayments. 87 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.
Output
An OpenAI-compatible JSON object containing the model name, an array of choices each with an assistant message (content and optional tool_calls), and a finish_reason (e.g. 'stop'). The top-level 'content' field mirrors the first choice's message content for convenience.
Example use cases
Agentic reasoning on complex tasks
“Use GPT-5.2 Pro to think through this multi-step problem: I have a dataset of customer churn events and want a structured plan for building a predictive model — give me a detailed breakdown of steps, tools, and potential pitfalls.”
Tool-calling agent for live data
“Call GPT-5.2 Pro with my list of function definitions for weather lookup and calendar scheduling, and ask it to plan my week given that it's raining in Seattle — let it call whichever tools it needs.”
Streaming response for chat UI
“Stream a GPT-5.2 Pro response to the user's message 'Explain quantum entanglement like I'm 12' so my app can display tokens as they arrive — use streaming mode.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/gpt-5.2-pro?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need access to GPT-5.2 Pro specifically — one of OpenAI's most capable frontier models — without committing to a monthly API subscription. Ideal for AI agents that make sporadic, high-value LLM calls and want to pay per invocation in USDC on Base, USDm on MegaETH, or USDC on Solana. Prefer this over cheaper sibling LLM endpoints when task complexity demands frontier-level reasoning, multi-step tool use, or nuanced instruction following.
Side effects
- Payment not settled — 402 returned if USDC/crypto payment fails or is insufficient
- Invalid message format — 422 if required 'messages' array is missing or malformed
- Tool schema error — model refuses or errors if function definitions are malformed
- Context length exceeded — error if combined message tokens exceed model limit
- Streaming interrupted — SSE stream may drop if network is unstable post-payment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "openai/gpt-5.2-pro",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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Zero review prompt (fires after every successful call)
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