# Keyronne Chain Gas Price API

> Keyronne Chain Gas Price API is a paid API for AI agents from keyronne.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns current gas price and EIP-1559 fee suggestions (base fee, priority tip, max fee) in gwei for Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain

## Facts

- Endpoint: POST https://keyronne.com/api/chain-gas
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/keyronne-chain-gas-price-api-eb14fd05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mMyuUaWsRl9SnVICXeg5S

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 keyronne-chain-gas-price-api-eb14fd05 -d '<json body>'
```

Example prompt: What are the current EIP-1559 gas fees on Ethereum — give me the base fee, priority tip, and suggested max fee in gwei.

## When to prefer this

Use this endpoint when you need real-time EIP-1559 gas fee data (base fee, priority tip, max fee) for one of six supported EVM chains without managing your own RPC node or API key. Ideal for agents that need to estimate transaction costs, decide whether to submit a transaction, or advise users on current network congestion across Ethereum mainnet or major L2s and sidechains.

## Known failure modes

- Invalid or unsupported chain name returns an error — must be one of: ethereum, base, arbitrum, optimism, polygon, bsc
- Upstream RPC node unavailable may cause timeout or 5xx error
- Payment not included or insufficient may result in 402 Payment Required
- Malformed JSON body returns 400 Bad Request

## How this service works

Current gas price and EIP-1559 fee suggestions (base fee, priority tip, suggested max fee) on Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain, in gwei. Public JSON-RPC, no API keys. POST a JSON body like: {"chain":"ethereum"}

## Output

A JSON object containing the current gas price and EIP-1559 fee parameters — base fee, priority tip (miner tip), and suggested max fee — all expressed in gwei, for the specified EVM-compatible chain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "enum": [
    "ethereum",
    "base",
    "arbitrum",
    "optimism",
    "polygon",
    "bsc"
   ],
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/keyronne-chain-gas-price-api-eb14fd05/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from keyronne.com](https://www.zero.xyz/host/keyronne.com/llms.txt)