# Phantom API — Arbitrum Gas Estimator

> Phantom API — Arbitrum Gas Estimator is a paid API for AI agents from phantom-api-omega.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Estimates gas costs for a transaction on the Arbitrum network before submission

## Facts

- Endpoint: POST https://phantom-api-omega.vercel.app/api/arbitrum/gas/estimate
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phantom-api-arbitrum-gas-estimator-e692a44e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B5TkW8txrWqby2l4ycb07

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 phantom-api-arbitrum-gas-estimator-e692a44e -d '<json body>'
```

Example prompt: Before I send this Arbitrum transaction — from 0xAbC...123 to 0xDeF...456 with calldata 0xa9059cbb... and value 0 — can you estimate how much gas it will use?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call Arbitrum gas estimate without maintaining your own RPC infrastructure. Ideal for agents that occasionally need gas preflight checks across multiple networks and want to avoid RPC node subscriptions. Use over Ethereum mainnet gas endpoints when the transaction targets Arbitrum specifically.

## Known failure modes

- Invalid address format for 'to' or 'from' fields returns a validation error
- Malformed or non-hex 'data' field causes a parsing error
- Transaction would revert on-chain, causing the estimate to fail or return an error
- Network congestion or RPC node unavailability may cause timeouts
- Payment not provided or insufficient USDC causes a 402 Payment Required response

## How this service works

Lightning-fast access to blockchain data, smart contract insights, and Web3 infrastructure across 57+ networks. Pay-per-call via x402.

## Output

Returns an estimated gas amount (in gas units) required to execute the described transaction on the Arbitrum network, allowing callers to set appropriate gas limits and estimate fees before submission.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string"
  },
  "data": {
   "type": "string"
  },
  "from": {
   "type": "string"
  },
  "value": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/phantom-api-arbitrum-gas-estimator-e692a44e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phantom-api-omega.vercel.app](https://www.zero.xyz/host/phantom-api-omega.vercel.app/llms.txt)