# wafermap.xyz GPT-OSS 120B

> wafermap.xyz GPT-OSS 120B is a paid API for AI agents from wafermap.xyz, paid per call via x402, $0.006/call, status unknown (last checked 2026-11-02).

Runs OpenAI's open-weight 120B reasoning model against a text prompt and returns a generated response, billed per call via x402.

## Facts

- Endpoint: POST https://wafermap.xyz/v1/gpt-oss-120b?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wafermap-xyz-gpt-oss-120b-b1ee9374
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-W_JFPpRqCTIxHbrhh0k-

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 wafermap-xyz-gpt-oss-120b-b1ee9374 -d '<json body>'
```

Example prompt: Use the GPT-OSS 120B model to reason through this: 'A company has 12 employees, each earning $4,200/month. If they hire 3 more at $5,100/month, what's the new total annual payroll?' Keep the answer under 300 tokens.

## When to prefer this

Choose this endpoint when you need a large open-weight model (120B parameters) with strong reasoning capabilities at a low per-call price ($0.00414 USDC). Prefer it over smaller models like DeepSeek Flash or Llama 4 Scout when the task involves complex multi-step reasoning, math, or nuanced generation. Prefer it over DeepSeek V4 Pro if you want OpenAI's model architecture specifically. Best when you need quality reasoning without committing to expensive proprietary API contracts.

## Known failure modes

- Prompt exceeds 24,000 character limit — request rejected
- max_tokens set to 0 or negative — validation error
- System prompt exceeds 8,000 character limit — rejected
- Payment not attached or insufficient USDC — 402 Payment Required
- Model inference timeout for very complex reasoning chains
- Empty or whitespace-only prompt — minLength validation failure

## How this service works

GPT-OSS 120B — OpenAI's open-weight 120B. Reasoning at a low price.

## Output

Returns a generated text completion from the GPT-OSS 120B open-weight model. The response contains the model's answer, reasoning, or generated content based on the provided prompt and optional system instructions, up to the specified max_tokens cap (default 1024, max 2048).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "prompt": {
   "type": "string",
   "maxLength": 24000,
   "minLength": 1,
   "description": "What you want, in plain words."
  },
  "system": {
   "type": "string",
   "maxLength": 8000,
   "minLength": 1,
   "description": "Optional instructions that shape every answer."
  },
  "max_tokens": {
   "type": "number",
   "maximum": 2048,
   "description": "Output cap. 2048 at most, 1024 by default.",
   "exclusiveMinimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wafermap-xyz-gpt-oss-120b-b1ee9374/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from wafermap.xyz](https://www.zero.xyz/host/wafermap.xyz/llms.txt)