# klymax402 Gas Estimator

> klymax402 Gas Estimator is a paid API for AI agents from klymax402.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns current gas fee estimates for one or all supported EVM-compatible blockchain networks

## Facts

- Endpoint: GET https://klymax402.com/api/gas-estimator/api/estimate
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/klymax402-gas-estimator-2a0c8737
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DUdXUWUvuPKcgne9e3J70

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 klymax402-gas-estimator-2a0c8737
```

Example prompt: What are the current gas fee estimates on Base and Polygon right now? I want to compare them before I decide which chain to use for my transaction.

## When to prefer this

Use this endpoint when you need real-time gas fee estimates for EVM-compatible chains (Ethereum, Base, Polygon, Arbitrum, BSC) without managing your own RPC connections or gas oracle integrations. It is especially useful when comparing fees across multiple chains in a single call and when operating in an x402 payment-enabled agent workflow where no API key management is desired.

## Known failure modes

- Invalid chain name returns empty estimates or error response
- Network connectivity issues to upstream gas data sources may return stale or empty data
- Unsupported chain identifier results in no matching estimate entries
- Payment failure (HTTP 402) if USDC payment on Base is not provided or insufficient

## How this service works

One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.

## Output

A JSON object containing an array of gas fee estimates per chain (or a single chain if specified), along with a timestamp indicating when the estimates were fetched. Each estimate includes fee data relevant to transaction cost on the queried network(s).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "estimates": [],
  "timestamp": "example"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/klymax402-gas-estimator-2a0c8737/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from klymax402.com](https://www.zero.xyz/host/klymax402.com/llms.txt)