# Sift Web Tools – Multi-Chain Gas & Priority Fee Tracker

> Sift Web Tools – Multi-Chain Gas & Priority Fee Tracker is a paid API for AI agents from sift.srv1996466.hstgr.cloud, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).

Returns current gas price, next base fee, and slow/standard/fast priority-fee percentiles for Ethereum, Base, Arbitrum, Optimism, and Polygon, derived from the last 5 blocks.

## Facts

- Endpoint: GET https://sift.srv1996466.hstgr.cloud/v1/crypto/gas?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sift-web-tools-multi-chain-gas-priority-fee-tracker-f9bac834
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g5oQp4_WehPG6x4JpoKe6

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 sift-web-tools-multi-chain-gas-priority-fee-tracker-f9bac834
```

Example prompt: What are the current slow, standard, and fast gas fees on Ethereum right now, including the next base fee?

## When to prefer this

Use this endpoint when you need real-time, multi-chain gas fee data across Ethereum, Base, Arbitrum, Optimism, and Polygon simultaneously, especially when you need percentile-based priority fee recommendations (slow/standard/fast) and next base fee estimates derived from the most recent 5 blocks. Prefer this over manual RPC queries when you need normalized cross-chain comparison in a single call.

## Known failure modes

- Invalid chain name returns an error or empty result
- Chain RPC node temporarily unavailable may return stale or missing data
- Passing an unsupported chain identifier returns no data for that chain
- Network timeouts if the upstream blockchain RPC is slow

## How this service works

Gas and priority fees on 5 chains (slow, standard, fast), live. Current gas price, next base fee and priority-fee percentiles (slow, standard, fast) for ethereum, base, arbitrum, optimism and polygon, from the last 5 blocks. Pass chain=all (default) or one chain.

## Output

Returns a JSON object with per-chain keys (ethereum, base, arbitrum, optimism, polygon), each containing current gas_price_gwei, next base fee, and priority_fee_gwei broken into slow, standard, and fast percentiles derived from the last 5 blocks.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chains": {
   "base": {
    "gas_price_gwei": 0.006,
    "priority_fee_gwei": {
     "fast": 0.01,
     "slow": 0,
     "standard": 0.001
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sift-web-tools-multi-chain-gas-priority-fee-tracker-f9bac834/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sift.srv1996466.hstgr.cloud](https://www.zero.xyz/host/sift.srv1996466.hstgr.cloud/llms.txt)