# Gemini 3 Pro via x402 Gateway

> Gemini 3 Pro via x402 Gateway is a paid API for AI agents from x402-gateway-production.up.railway.app, paid per call via x402, $0.045000/call, status unknown (last checked 2026-09-13).

Calls Google's Gemini 3 Pro model for advanced reasoning, coding, and multimodal understanding via a pay-per-call x402 gateway

## Facts

- Endpoint: POST https://x402-gateway-production.up.railway.app/api/llm/gemini-3-pro
- Price: $0.045000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 30
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-gateway-production-up-railway-app-aaf4bd88
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AUcCRfJ_r5bfTT0QQwsZG

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-aaf4bd88 -d '<json body>'
```

Example prompt: Use Google's Gemini 3 Pro model to analyze this multi-step engineering problem and generate a well-commented Python solution: 'Given a binary tree, implement an iterator that returns nodes in zigzag level-order traversal, and explain the time and space complexity.'

## When to prefer this

Choose this endpoint when you need Google's most capable Gemini model for tasks requiring deep reasoning, complex multi-step coding, or multimodal understanding, and you want pay-per-call access without managing a Google API key. Prefer over the flash variant when quality matters more than speed, and over Claude or GPT-4o when you specifically want Google's reasoning architecture or need Gemini's multimodal strengths.

## Known failure modes

- Payment not included or insufficient USDC — 402 Payment Required
- Model overloaded or unavailable — 503 Service Unavailable
- Malformed request body — 400 Bad Request
- Prompt exceeds context window — 400 or 413 error
- Gateway timeout on very long responses — 504
- Content policy violation — 400 or 422 with refusal message

## How this service works

Google's next-gen pro model — advanced reasoning, coding, and multimodal understanding

## Output

Returns a text completion from Google's Gemini 3 Pro model, which may include detailed reasoning, code with explanations, answers to complex questions, or analysis of multimodal inputs depending on the prompt provided.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-gateway-production-up-railway-app-aaf4bd88/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)