# Multi-Chain Gas Oracle & Whale Watch

> Multi-Chain Gas Oracle & Whale Watch is a paid API for AI agents from gas-optical-production-30aa.up.railway.app, paid per call via x402, $0.0001/call, status unknown (last checked 2026-10-16).

Returns live gas prices for Base, Ethereum, Arbitrum, and Optimism, plus ETH price, current block number, gas predictions, and large whale transfers on Base.

## Facts

- Endpoint: GET https://gas-optical-production-30aa.up.railway.app/gas?utm_source=zero.xyz
- Price: $0.0001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/multi-chain-gas-oracle-whale-watch-d77f2885
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_p5Y1npHqyGc3qFH1qKhmE

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 multi-chain-gas-oracle-whale-watch-d77f2885
```

Example prompt: What are the live gas prices right now across Base, Ethereum, Arbitrum, and Optimism, and are there any big whale transfers happening on Base?

## When to prefer this

Choose this endpoint when you need a single unified call to get real-time gas prices across all four major EVM chains (Base, Ethereum, Arbitrum, Optimism) simultaneously, especially when you also want ETH price, block number, gas predictions, and Base whale activity in one response. It is particularly useful for DeFi agents optimizing transaction routing or monitoring large on-chain movements.

## Known failure modes

- Upstream RPC node unavailability may cause stale or missing chain data
- Rate limiting if called excessively without valid x402 payment
- Payment failure (invalid or insufficient USDC) results in 402 response
- Partial data if one chain's RPC is degraded while others succeed

## How this service works

Live gas prices across Base, Ethereum, Arbitrum, and Optimism, plus ETH price, block number, gas prediction, and large Base whale transfers. Paid via x402 on Base mainnet.

## Output

A JSON object containing real-time gas prices (in gwei or equivalent) for Base, Ethereum, Arbitrum, and Optimism; current ETH price; current block number; a gas prediction for upcoming blocks; and a list of recent large whale transfers on Base — all timestamped.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "base": 12.4,
  "arbitrum": 0.11,
  "ethereum": 18.2,
  "optimism": 0.05,
  "timestamp": 1710000000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/multi-chain-gas-oracle-whale-watch-d77f2885/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gas-optical-production-30aa.up.railway.app](https://www.zero.xyz/host/gas-optical-production-30aa.up.railway.app/llms.txt)