# x402node Multi-Chain Gas Price Tracker

> x402node Multi-Chain Gas Price Tracker is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).

Returns current gas prices (gwei) and latest base fee for Ethereum, Base, Arbitrum, Optimism, and Polygon in a single API call

## Facts

- Endpoint: GET https://api.x402node.dev/chain/multi-gas?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402node-multi-chain-gas-price-tracker-6fdef0fd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UrnMZ5JFB0OavxiqAZWZX

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 x402node-multi-chain-gas-price-tracker-6fdef0fd
```

Example prompt: What are the current gas prices across Ethereum, Base, Arbitrum, Optimism, and Polygon right now — and which chain has the lowest fees?

## When to prefer this

Use this endpoint when you need a single-call snapshot of gas prices across all major EVM chains simultaneously — ideal for routing transactions to the cheapest chain, displaying gas dashboards, or deciding when to submit a transaction. Prefer this over per-chain gas endpoints when you need cross-chain comparison without multiple API calls.

## Known failure modes

- Upstream RPC node unavailable for one or more chains — partial or degraded response
- Rate limit exceeded — HTTP 429
- Payment not received or invalid x402 payment header — HTTP 402
- Network timeout if any chain RPC is slow — may return stale or missing data for affected chain

## How this service works

Current gas price across Ethereum, Base, Arbitrum, Optimism and Polygon in one call, returns gwei gas price and latest base fee per chain. multichain gas price, gas fee comparison, gwei, l2 gas tracker, cheapest chain for transaction Accepts payment on Base or Solana — either network works.

## Output

Returns an object with gas price data per chain, including gwei gas price and latest base fee for each of: Ethereum, Base, Arbitrum, Optimism, and Polygon — enabling direct comparison of transaction costs across networks.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "chains": {
       "type": "string",
       "description": "Comma list to limit chains, default all five"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402node-multi-chain-gas-price-tracker-6fdef0fd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402node.dev](https://www.zero.xyz/host/api.x402node.dev/llms.txt)