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EVM Gas Price Comparator
x402
EVM Gas Price Comparator is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Returns live gas prices across Base, Ethereum, Arbitrum, Optimism, Polygon, and BSC converted to USD costs for transfers and swaps, sorted cheapest-first with a chain recommendation.
Price / call$0.002
Success—
StatusUnknown
How this service works
Which EVM chain is cheapest to execute on right now? Live gas price on Base, Ethereum, Arbitrum, Optimism, Polygon and BSC, converted to USD per native transfer (21k gas), ERC-20 transfer (65k) and swap (150k), sorted cheapest first, with cheapest chain, Ethereum-vs-cheapest multiple and a one-line recommendation. chains=base,ethereum,... to filter, gas=N for your own gas units. Multi-RPC failover per chain, native prices Binance>OKX>Coinbase, 30s cache.
Output
A JSON object containing per-chain data (gas price in gwei, USD cost for native transfer, ERC-20 transfer, and swap, upstream RPC URL, latency, native token price), sorted cheapest-first by swap cost, plus a top-level 'cheapest' chain name, Ethereum-vs-cheapest multiplier, a one-line human-readable recommendation, and a timestamp of when prices were last updated.
Example use cases
Cheapest chain routing for DeFi bot
“Before I execute this token swap, check which chain — Base, Arbitrum, Optimism, or Ethereum — has the lowest swap fee right now in USD and tell me how much I'd save versus doing it on Ethereum mainnet.”
ERC-20 transfer cost audit
“I need to send an ERC-20 token to a friend. Check current gas prices across Base, Polygon, BSC, and Ethereum and tell me which chain is cheapest for a standard ERC-20 transfer right now.”
Custom gas units cost estimate
“I have a contract interaction that uses roughly 200000 gas units. Compare the cost in USD across all supported EVM chains right now and recommend the cheapest one to execute on.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/crypto/gas-compare?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to make real-time routing decisions about which EVM chain to use for a transaction, especially when minimizing gas costs in USD terms. It is purpose-built for agentic on-chain workflows that must compare multiple chains simultaneously, need USD-denominated cost estimates for different transaction types (transfer, ERC-20, swap), and want a ready-made recommendation rather than raw gwei values. Prefer it over querying individual chain RPCs directly when you need cross-chain comparison in a single call with multi-RPC failover reliability.
Side effects
- All RPCs for a chain fail — that chain may be omitted or return stale data
- Binance/OKX/Coinbase price feeds unavailable — native token USD conversion may fail
- Invalid chain name in filter returns empty or partial results
- Payment not processed (x402) — 402 response with payment instructions
- Rate limiting or Cloudflare Worker timeout under high load
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"chains": [
{
"chain": "base",
"native": "ETH",
"chain_id": 8453,
"swap_usd": 0.0011,
"upstream": "https://base.drpc.org",
"latency_ms": 80,
"native_usd": 3850.1,
"transfer_usd": 0.000154,
"gas_price_gwei": 0.0019,
"erc20_transfer_usd": 0.000476,
"rollup_l1_fee_extra": true
}
],
"cheapest": "base",
"gas_units": {
"swap": 150000,
"transfer": 21000,
"erc20_transfer": 65000
},
"sorted_by": "swap_usd",
"updated_at": "2026-10-30T01:30:00Z",
"recommendation": "Execute on base (~180x cheaper than Ethereum L1); ...",
"cheapest_swap_usd": 0.0011,
"ethereum_vs_cheapest_x": 180
}
}Tags
x402
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