# HorizonPulse Ethereum Gas Fee Oracle

> HorizonPulse Ethereum Gas Fee Oracle is a paid API for AI agents from horizonpulse.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Returns live Ethereum and Base network gas fee data including baseFee, priority fees, suggested maxFee, timing hint (cheap/normal/expensive), and optional ETH transfer cost in USD

## Facts

- Endpoint: GET https://horizonpulse.dev/api/gas?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/horizonpulse-ethereum-gas-fee-oracle-3c2f3c39
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KYhPWDSwaPO74vDrvHDcH

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 horizonpulse-ethereum-gas-fee-oracle-3c2f3c39
```

Example prompt: What are the current Ethereum gas fees — is it cheap or expensive to transact right now, and how much would a basic ETH transfer cost in USD?

## When to prefer this

Choose this endpoint when you need real-time Ethereum or Base gas fee data with actionable timing guidance (cheap/normal/expensive) and USD cost context, especially in DeFi agent workflows where timing a transaction for low-cost windows matters. Prefer over raw RPC calls when you want pre-interpreted signals without managing your own eth_feeHistory parsing. Best suited for lightweight, per-call gas checks at $0.01 USDC rather than maintaining a dedicated gas oracle infrastructure.

## Known failure modes

- RPC node unavailability may cause stale or missing fee data
- eth_feeHistory call failure returns error or empty response
- Network congestion spikes may cause rapidly outdated estimates between call and transaction submission
- Invalid query parameters return 400-level errors
- Payment failure via x402 protocol returns 402 Payment Required

## How this service works

Pay-per-call APIs for AI agents via x402 on Base: web fetch, HTTP proxy, page extract, and crypto market data.

## Output

Returns a snapshot of current Ethereum/Base gas conditions including: baseFee (current base fee in gwei), priority fee recommendation, suggested maxFee for transaction submission, a timingHint enum ('cheap', 'normal', or 'expensive') indicating current network congestion, and an optional estimated USD cost for a standard ETH transfer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "asOf": "2026-10-01T14:36:44.639Z",
  "ethUsd": 2699.12,
  "networks": [
   {
    "ok": true,
    "chainId": 8453,
    "network": "base",
    "timingHint": "normal",
    "baseFeeGwei": "0.005",
    "simpleTransfer": {
     "costEth": "0.000000231",
     "costUsd": 0.000623,
     "costWei": "231000000000",
     "gasLimit": 21000
    },
    "priorityFeeGwei": "0.001",
    "suggestedMaxFeeGwei": "0.011",
    "priorityFeePercentilesGwei": {
     "p10": "0.000000079",
     "p50": "0.001",
     "p90": "0.01"
    }
   },
   {
    "ok": true,
    "chainId": 1,
    "network": "ethereum",
    "timingHint": "expensive",
    "baseFeeGwei": "0.47866594",
    "simpleTransfer": {
     "costEth": "0.000025243225938",
     "costUsd": 0.068134,
     "costWei": "25243225938000",
     "gasLimit": 21000
    },
    "priorityFeeGwei": "0.244726498",
    "suggestedMaxFeeGwei": "1.202058378",
    "priorityFeePercentilesGwei": {
     "p10": "0.001003273",
     "p50": "0.244726498",
     "p90": "2"
    }
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/horizonpulse-ethereum-gas-fee-oracle-3c2f3c39/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from horizonpulse.dev](https://www.zero.xyz/host/horizonpulse.dev/llms.txt)