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Multi-Chain Gas Price Tracker (USD-Normalized)
x402
Multi-Chain Gas Price Tracker (USD-Normalized) is a paid API for AI agents from x402.donnyautomation.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns live gas prices across 6 EVM chains (BNB Chain, Polygon, Arbitrum, Base, Avalanche, Optimism) in gwei, base fee, and USD cost for transfers, ERC-20 transfers, and swaps, sorted cheapest-first.
Price / call$0.01
Success—
StatusUnknown
How this service works
Live gas price on BNB Chain, Polygon, Arbitrum, Base, Avalanche and Optimism, converted to USD and ranked cheapest-first. Gwei is NOT comparable across chains because the gas token differs in price; USD is the only honest ranking. Returns chains[] with gasPriceGwei, baseFeeGwei, nativeUsd and costUsd for transfer, erc20Transfer and swap, plus cheapest and mostExpensive. Optional ?chain=all or one chain key; 400 unknown_chain otherwise. Send chain=all - a bare call skips the free tier.
Output
A JSON array of chain objects sorted cheapest-first, each containing: chain name, gas price in gwei, base fee, and the USD cost of a standard native transfer, an ERC-20 transfer, and a DEX swap. Enables direct USD-denominated comparison across chains without needing to account for differing gas token prices.
Example use cases
Cheapest chain routing for DeFi agent
“Before I execute this swap, check all six chains and tell me which one will cost me the least in USD for a token swap right now — rank them cheapest-first.”
Cross-chain bridge timing decision
“I want to bridge some funds and I'm flexible on which chain to land on — which of Arbitrum, Base, Optimism, Polygon, BNB Chain, and Avalanche has the lowest gas fees right now in USD?”
ERC-20 transfer cost audit
“What's the current USD cost to send an ERC-20 token on each of the major chains? I need to pick the cheapest one for a batch of transfers I'm about to run.”
Technical details
Endpoint
GEThttps://x402.donnyautomation.com/gasWhen to prefer
Use this endpoint when you need USD-normalized gas cost comparisons across multiple EVM chains simultaneously — particularly for routing, bridging, or execution-timing decisions where raw gwei figures are misleading because gas token prices differ. Prefer this over chain-specific gas APIs when the goal is cross-chain ranking rather than monitoring a single network.
Side effects
- Missing or invalid chain parameter results in paywall redirect — always pass chain=all or a specific chain name
- Invalid chain value (e.g. 'ethereum') returns an error; only bsc, polygon, arbitrum, base, avalanche, optimism are valid
- RPC outage on one or more chains may cause partial results or stale data
- Payment failure (x402) blocks access if USDC balance is insufficient
- Network latency from on-chain RPC reads may occasionally return slightly stale gas data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ts": "2026-07-31T00:00:00.000Z",
"chainId": 56,
"network": "bsc"
}
}Tags
x402
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