# GEDX402 Gemma 4 26B LLM (x402)

> GEDX402 Gemma 4 26B LLM (x402) is a paid API for AI agents from llm.gedx402.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Runs inference on Google's Gemma 4 26B instruction-tuned model, billed per-call via USDC micropayment on multiple chains, no API key required.

## Facts

- Endpoint: GET https://llm.gedx402.com/v1/llm/gemma-4-26b-a4b-it
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gedx402-gemma-4-26b-llm-x402-63be2e18
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_avpLc72F-8V93TmsmVK4_

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-gemma-4-26b-llm-x402-63be2e18
```

Example prompt: Ask Gemma 4 26B to explain how transformers work — send it as a single user message and cap the reply at 512 tokens, paying per-call in USDC with no API key needed.

## When to prefer this

Choose this endpoint when you need a capable open-weight instruction-tuned LLM (Gemma 4 26B) with no API key or account registration, and you can pay per-call in USDC via x402 on Base, Polygon, Arbitrum, World, or Solana. Ideal for agents operating in crypto-native environments or where traditional API key management is undesirable.

## Known failure modes

- Payment not received or insufficient USDC balance — 402 Payment Required returned
- Invalid message role value (not system/user/assistant) — 400 Bad Request
- max_tokens exceeds 4096 — validation error
- Empty or malformed messages array — 400 Bad Request
- Unsupported payment chain — payment rejected
- Model inference timeout on very long contexts

## 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 (@cf/google/gemma-4-26b-a4b-it) and the assistant's generated text reply as a string under the 'response' key.

## 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/google/gemma-4-26b-a4b-it",
  "response": "Hello!"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gedx402-gemma-4-26b-llm-x402-63be2e18/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)