# x402 Gateway – OpenAI o1 Reasoning Model

> x402 Gateway – OpenAI o1 Reasoning Model is a paid API for AI agents from x402-gateway-production.up.railway.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Runs OpenAI's o1 reasoning model via a pay-per-call x402-gated API, excelling at complex math, science, coding, and multi-step problem solving

## Facts

- Endpoint: POST https://x402-gateway-production.up.railway.app/api/llm/o1
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-gateway-production-up-railway-app-f65a8332
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TjndIIpEhU1vh-2JVWyxK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-gateway-production-up-railway-app-f65a8332 -d '<json body>'
```

Example prompt: Use OpenAI's o1 reasoning model to solve this step by step: 'A train leaves Chicago at 9am traveling at 80mph toward New York, 790 miles away. Another leaves New York at 10am at 100mph. At what time and distance from Chicago do they meet?' Show your full reasoning chain.

## When to prefer this

Choose this endpoint when the task requires deep multi-step reasoning, complex mathematics, scientific analysis, or hard coding problems where accuracy and chain-of-thought are more important than speed. Prefer over GPT-4o or Claude for olympiad-style math, logic proofs, or algorithmic puzzles. Use when you need OpenAI's o1 specifically rather than a faster/cheaper general-purpose model.

## Known failure modes

- Payment not included or invalid x402 USDC payment header — returns 402 Payment Required
- Malformed or empty prompt body — returns 400 Bad Request
- Model overloaded or upstream OpenAI API unavailable — returns 503 or timeout
- Request exceeds token context limit — truncated or error response
- Network issues with Railway deployment — intermittent 5xx errors

## How this service works

OpenAI's reasoning model — excels at math, science, coding, and multi-step problem solving

## Output

A detailed, chain-of-thought-style text response from OpenAI's o1 model, including intermediate reasoning steps and a final answer to the input prompt.

## Example request

```json
{
 "model": "o1",
 "messages": [
  {
   "role": "user",
   "content": "A train leaves Chicago at 9am traveling at 80mph toward New York, 790 miles away. Another leaves New York at 10am at 100mph toward Chicago. At what time and distance from Chicago do they meet? Show your full reasoning chain."
  }
 ],
 "max_tokens": 8000
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-gateway-production-up-railway-app-f65a8332/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-gateway-production.up.railway.app](https://www.zero.xyz/host/x402-gateway-production.up.railway.app/llms.txt)