# Arbitrum One Gas Conditions

> Arbitrum One Gas Conditions is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-30).

Returns current Arbitrum One gas metrics including block number, base fee, gas price, priority fee in gwei, and estimated ETH and USD costs for native and ERC-20 transfers.

## Facts

- Endpoint: GET https://onchaincheck.dev/arbitrum/gas?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arbitrum-one-gas-conditions-0ac69bca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_92O1drikhG5Mo3Yqxz3Kb

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 arbitrum-one-gas-conditions-0ac69bca
```

Example prompt: What are the current gas conditions on Arbitrum One — base fee, gas price, and how much would a native ETH transfer and an ERC-20 transfer cost right now in both ETH and USD?

## When to prefer this

Use this endpoint when you need real-time gas cost estimates specifically for Arbitrum One, including both gwei-level fee data and USD-denominated transfer cost estimates using a live ETH price feed. Prefer this over generic gas trackers when you need ERC-20 vs native transfer cost breakdowns on Arbitrum specifically.

## Known failure modes

- RPC node unavailable or rate-limited — may return 5xx error
- Chainlink ETH/USD feed stale or unavailable — USD estimates may be missing or outdated
- Network congestion causing delayed block data
- Payment not included or invalid — returns 402 Payment Required

## How this service works

Current Arbitrum One gas conditions: block number, base fee, gas price and priority fee in gwei, and the estimated cost in ETH and USD of a native transfer and an ERC-20 transfer (Chainlink ETH/USD).

## Output

A JSON object containing: chain name ('arbitrum'), current block number, block timestamp, ETH/USD price (from Chainlink), base fee in gwei, gas price in gwei, max priority fee in gwei, and estimated costs for both a native ETH transfer and an ERC-20 transfer expressed in both ETH and USD. Note: excludes Arbitrum's L1 data fee surcharge.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Excludes Arbitrum One's L1 data fee, which adds a small amount per transaction.",
  "chain": "arbitrum",
  "blockTime": "2026-10-22T15:50:24.000Z",
  "nativeUsd": 2392.97,
  "baseFeeGwei": "0.020256",
  "blockNumber": 517269449,
  "gasPriceGwei": "0.020256",
  "nativeSymbol": "ETH",
  "estimatedCost": {
   "erc20Transfer": {
    "usd": 0.003151,
    "native": "0.00000131664"
   },
   "nativeTransfer": {
    "usd": 0.001018,
    "native": "0.000000425376"
   }
  },
  "maxPriorityFeeGwei": "0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arbitrum-one-gas-conditions-0ac69bca/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchaincheck.dev](https://www.zero.xyz/host/onchaincheck.dev/llms.txt)