# Coin Railz Gas Price Oracle

> Coin Railz Gas Price Oracle is a paid API for AI agents from coinrailz.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Returns real-time gas prices for multiple blockchain networks with USD cost estimates

## Facts

- Endpoint: POST https://coinrailz.com/x402/service/gas-price-oracle
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coin-railz-gas-price-oracle-b9eaa700
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ppbBIqNeWsYv_ANOi42nB

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 coin-railz-gas-price-oracle-b9eaa700 -d '<json body>'
```

Example prompt: What are the current gas prices on Ethereum, Polygon, and Arbitrum right now, and how much would a typical transaction cost in USD on each?

## When to prefer this

Use this endpoint when an agent needs real-time, multi-chain gas price data with USD cost estimates in a single call — particularly useful for DeFi automation, cross-chain routing decisions, or cost-optimization workflows where knowing the cheapest network to transact on is critical.

## Known failure modes

- Unsupported chain identifier returns error or is omitted from results
- Network congestion may cause stale or unavailable gas data for specific chains
- Payment failure (insufficient USDC balance) results in 402 error before data is returned
- Empty chains array may return all supported chains or an error depending on implementation

## How this service works

Real-time gas prices for multiple chains with USD cost estimates

## Output

Returns real-time gas prices (in native units like gwei) for each requested blockchain network along with estimated USD cost per transaction, enabling cost comparison across chains.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chains": {
   "type": "array",
   "description": "Chains to check (optional, default: all)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coin-railz-gas-price-oracle-b9eaa700/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coinrailz.com](https://www.zero.xyz/host/coinrailz.com/llms.txt)