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Sift Web Tools – Multi-Chain Gas & Priority Fee Tracker
x402
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.
Price / call$0.001
Success—
StatusUnknown
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.
Example use cases
Pre-transaction gas check on Ethereum
“Before I submit this ETH transfer, can you check what the current slow, standard, and fast priority fees are on Ethereum so I can pick the right one?”
Cheapest chain for DeFi swap
“I want to do a DeFi swap and want to pay as little gas as possible — can you pull the current gas prices across all supported chains (Ethereum, Base, Arbitrum, Optimism, Polygon) and tell me which is cheapest right now?”
Monitor Polygon gas for batch execution
“What's the current base fee and priority fee on Polygon? I need to know if gas is low enough to kick off my batch of transactions.”
Technical details
Endpoint
GEThttps://sift.srv1996466.hstgr.cloud/v1/crypto/gas?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"chains": {
"base": {
"gas_price_gwei": 0.006,
"priority_fee_gwei": {
"fast": 0.01,
"slow": 0,
"standard": 0.001
}
}
}
}
}Tags
x402
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