# Gas Estimator - EVM Multi-Chain Gas Price API

> Gas Estimator - EVM Multi-Chain Gas Price API is a paid API for AI agents from gas-estimator.api.klymax402.com, paid per call via x402, $0.002000/call, status unknown (last checked 2026-09-14).

Returns current gas price estimates with USD cost equivalents across multiple EVM-compatible blockchain networks

## Facts

- Endpoint: GET https://gas-estimator.api.klymax402.com/api/estimate
- Price: $0.002000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gas-estimator-api-klymax402-com-cd1d0fed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_t1sIsYiok0kIojfz2x093

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 gas-estimator-api-klymax402-com-cd1d0fed
```

Example prompt: What are the current gas price estimates in USD across all EVM chains — Ethereum, Base, Polygon, Arbitrum, and BSC?

## When to prefer this

Use this endpoint when an AI agent needs to estimate blockchain transaction costs in USD before executing an on-chain operation, compare gas fees across multiple EVM networks to pick the cheapest chain, or inform a user about current network congestion costs. Ideal for DeFi automation, cross-chain routing decisions, and any workflow where gas cost awareness is needed.

## Known failure modes

- Unsupported chain name returns an error — only 'ethereum', 'base', 'polygon', 'arbitrum', 'bsc' are valid
- Network timeout if the underlying RPC nodes are unreachable
- Payment failure (402) if the x402 payment of 0.002 USDC is not provided or rejected
- Stale gas data if upstream chain RPC is lagging

## How this service works

Get gas price estimates across multiple EVM chains with USD cost

## Output

Returns current gas price estimates for one or all supported EVM chains (ethereum, base, polygon, arbitrum, bsc), including the estimated USD cost of a transaction at current network conditions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "description": "Chain name: ethereum, base, polygon, arbitrum, bsc. Omit for all chains."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gas-estimator-api-klymax402-com-cd1d0fed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gas-estimator.api.klymax402.com](https://www.zero.xyz/host/gas-estimator.api.klymax402.com/llms.txt)