# GEDX402 Nemotron-3-120B LLM (x402)

> GEDX402 Nemotron-3-120B LLM (x402) is a paid API for AI agents from llm.gedx402.com, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-15).

Runs a conversation through NVIDIA's Nemotron-3-120B language model via Cloudflare Workers AI, billed per-call in USDC with no API key required.

## Facts

- Endpoint: GET https://llm.gedx402.com/v1/llm/nemotron-3-120b-a12b
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gedx402-nemotron-3-120b-llm-x402-d4ab7bca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wnJ1qPouzmheCJrd1S4OO

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 gedx402-nemotron-3-120b-llm-x402-d4ab7bca
```

Example prompt: Ask the Nemotron-3-120B model: given a system prompt 'You are a helpful assistant', user message 'Explain quantum entanglement in simple terms', and a max of 512 tokens — pay with USDC, no API key needed.

## When to prefer this

Choose this endpoint when you need a very large (120B parameter) NVIDIA Nemotron model for high-quality text generation, want to pay per-call in USDC without registering for an API key, and need to use crypto-native payment rails (Base, Polygon, Arbitrum, World, or Solana). Prefer over OpenAI or Anthropic hosted endpoints when API-key-free, blockchain-settled micropayments are required.

## Known failure modes

- Insufficient USDC balance or payment failure — 402 Payment Required with payment details
- Invalid message format (missing role or content) — 400 Bad Request
- max_tokens out of range (must be 1–4096) — 400 validation error
- Model unavailable or Cloudflare Workers AI outage — 503 Service Unavailable
- Malformed JSON body — 400 parse error

## How this service works

x402 workers ai. pay with usdc on base, polygon, arbitrum, world, or solana. no api keys.

## Output

A JSON object containing the model identifier ('model': '@cf/nvidia/nemotron-3-120b-a12b') and the generated assistant reply text ('response': '...').

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant"
      ],
      "type": "string",
      "description": "Speaker role for this turn."
     },
     "content": {
      "type": "string",
      "description": "Message text for this turn."
     }
    }
   },
   "description": "Conversation turns in order (system, user, assistant)."
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 4096,
   "minimum": 1,
   "description": "Maximum tokens to generate in the assistant reply."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "model": "@cf/nvidia/nemotron-3-120b-a12b",
  "response": "Hello!"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gedx402-nemotron-3-120b-llm-x402-d4ab7bca/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llm.gedx402.com](https://www.zero.xyz/host/llm.gedx402.com/llms.txt)