# Phantom API — Katana Gas Estimator

> Phantom API — Katana 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 2026-10-20).

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

## Facts

- Endpoint: POST https://phantom-api-omega.vercel.app/api/katana/gas/estimate?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phantom-api-katana-gas-estimator-8bfd8c6c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O9bgaqSGRMZM3yRGZ-e60

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-katana-gas-estimator-8bfd8c6c -d '<json body>'
```

Example prompt: Before I send this contract call, estimate the gas cost on the Katana network — the transaction is from 0xAbC123... to 0xDef456..., with calldata 0xa9059cbb... and value 0.

## When to prefer this

Use this endpoint when you need a quick, pay-per-call gas estimate for transactions specifically on the Katana network without provisioning your own RPC node or managing blockchain infrastructure. Ideal for agents that need to pre-check transaction costs before execution, set gas limits programmatically, or surface fee estimates to users in a lightweight, serverless manner.

## Known failure modes

- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed or non-hex 'data' field may cause parsing failure
- Network unavailability or Katana RPC issues may result in timeout or 503
- Insufficient request body (missing required fields) may return 400 Bad Request
- Payment not included or insufficient USDC may result in 402 Payment Required

## 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 a gas estimate (likely in gas units or as a fee in native token) for the described transaction on the Katana network, allowing the caller to budget, set gas limits, or decide whether to proceed before committing to an on-chain transaction.

## 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-katana-gas-estimator-8bfd8c6c/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)