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Multi-chain Gas Oracle (x402)
x402
Multi-chain Gas Oracle (x402) is a paid API for AI agents from gas-oracle.frcompanycheck.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).
Returns EIP-1559 gas price data (base fee, priority fee percentiles, suggested maxFee/priority) for Ethereum, Base, Arbitrum, Optimism, Polygon, and BSC via public RPCs, paid per-call with USDC over x402.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call EIP-1559 gas oracle for AI agents: ethereum, base, arbitrum, optimism, polygon, bsc. Returns gas_price, base_fee, priority fee percentiles and suggested maxFee/priority. Public RPCs only, no API key. x402 USDC on Base.
Output
A JSON object containing the chain name, chain ID, current base fee in gwei, gas price in gwei, suggested maxFee per gas in gwei, and suggested priority fee in gwei, derived from live public RPC data for the requested EVM-compatible network.
Example use cases
DeFi bot transaction cost check
“Before I submit this swap on Arbitrum, what's the current base fee and suggested maxFee so I can make sure my transaction goes through quickly without overpaying?”
Multi-chain gas comparison dashboard
“Pull the current gas prices for Ethereum, Base, and Optimism so I can see which network is cheapest to transact on right now.”
Automated NFT minting gas gating
“Check the current gas price on Polygon — if the base fee is under 50 gwei, I want to proceed with minting; otherwise wait.”
Technical details
Endpoint
GEThttps://gas-oracle.frcompanycheck.workers.dev/v1/%7Bchain%7D/gas?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, no-API-key EIP-1559 gas estimate for any of the six supported EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC) and want structured fee data (base fee, maxFee, priority fee) in a single pay-per-call request. Prefer it over free public RPC calls when you want a normalized, parsed JSON response without handling raw eth_gasPrice or eth_feeHistory RPC responses yourself.
Side effects
- Unsupported chain name returns an error — only ethereum, base, arbitrum, optimism, polygon, and bsc are valid
- Public RPC unavailability for the requested chain may cause timeouts or stale data
- Missing or malformed x402 USDC payment on Base results in a 402 Payment Required response
- Rate limits or public RPC throttling may degrade response freshness under high load
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"chain_id": 8453,
"base_fee_gwei": 0.005,
"gas_price_gwei": 0.006,
"suggested_max_fee_gwei": 0.011,
"suggested_priority_gwei": 0.001
}
}Tags
x402
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