# BaseBuilder DeFi – Arbitrum Gas Price API

> BaseBuilder DeFi – Arbitrum Gas Price API is a paid API for AI agents from bb-defi.vercel.app, paid per call via x402, $0.092834/call, status unknown (last checked 2026-09-16).

Returns current gas price data for the Arbitrum network

## Facts

- Endpoint: POST https://bb-defi.vercel.app/api/gas/arbitrum
- Price: $0.092834/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-defi-arbitrum-gas-price-api-68765ea5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b-taem07quNzcjdDJ4Yk3

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 basebuilder-defi-arbitrum-gas-price-api-68765ea5 -d '<json body>'
```

Example prompt: What's the current gas price on Arbitrum right now? I want to know if it's a good time to submit a DeFi transaction.

## When to prefer this

Use this endpoint when you need real-time Arbitrum gas price data to estimate transaction costs, decide whether to delay a DeFi operation, or set gas parameters programmatically. Prefer this over generic Ethereum mainnet gas APIs when the target chain is specifically Arbitrum (One or Nova).

## Known failure modes

- Network or RPC node unavailable — upstream provider error
- Malformed request body — 400 bad request
- Payment not processed or insufficient USDC — 402 payment required
- Arbitrum RPC endpoint rate-limited or down — 503 service unavailable
- Stale or delayed gas data if upstream provider is lagging

## How this service works

BaseBuilder Defi API hub - 22 paid endpoints

## Output

Returns current gas price metrics for the Arbitrum network, likely including standard/fast/slow gas price tiers in gwei or wei, enabling the agent to estimate transaction costs before submitting on-chain operations.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-defi-arbitrum-gas-price-api-68765ea5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-defi.vercel.app](https://www.zero.xyz/host/bb-defi.vercel.app/llms.txt)