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x-402 LLM Pro (Long-form Inference)
x402
x-402 LLM Pro (Long-form Inference) is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-20).
Runs long-form LLM inference with up to 8000 output tokens, providing extended answers that standard LLM endpoints would truncate.
Price / call$0.02
Success—
StatusUnknown
How this service works
Get a long completion with a large output budget, same engine as /v1/llm. Long-form LLM inference: same engine as /v1/llm with a four times larger output budget, up to 8000 tokens, for answers the cheap route truncates. Body: {prompt, system?, max_tokens?}
Output
The agent receives a generated text completion from the LLM with up to 8000 output tokens, suitable for long-form content, detailed explanations, extensive documents, and thorough analyses that would be truncated by standard inference endpoints.
Example use cases
Full business plan generation
“Draft me a complete business plan for a B2B SaaS startup targeting HR departments — include market analysis, value proposition, go-to-market strategy, and financial projections. I need the full thing, not a skeleton.”
In-depth technical documentation
“Generate comprehensive API documentation for a REST service that manages user authentication, including all endpoints, request/response schemas, error codes, and example curl commands — the long version, please.”
Detailed research summary
“Give me an in-depth summary of the current state of quantum computing research, covering qubit types, error correction approaches, leading players, and near-term commercial prospects — I want the full detailed writeup, not just bullet points.”
Technical details
Endpoint
GEThttps://api.x-402.online/v1/llm/pro?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need LLM-generated responses longer than ~2000 tokens — such as full documents, detailed reports, long essays, or complex multi-part answers — and the standard /v1/llm endpoint would truncate the output. Prefer this over the base LLM endpoint whenever completeness of the answer matters more than cost savings.
Side effects
- Prompt too vague or empty — model may produce off-topic or minimal output
- max_tokens set below actual needed length — response still truncated
- Rate limiting or payment failure at $0.006 USDC per call — 402 payment required error
- Model timeout on extremely complex prompts
- Prompt injection in user-supplied content passed through to the model
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"usage": {
"output_tokens": 300
},
"output": "…"
}
}Tags
x402
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