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Base Gas Oracle (x402)
x402
Base Gas Oracle (x402) is a paid API for AI agents from base-gas-x402-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns live EIP-1559 gas fee tiers and estimated transaction costs for Base mainnet, payable per-call via x402.
Price / call$0.01
Success—
StatusUnknown
How this service works
Live gas cost comparison across Base, OP Mainnet, Arbitrum One, and Ethereum in one call, ranked cheapest first.
Output
A JSON object containing: current gas price in gwei, EIP-1559 baseFeePerGas, estimated transaction cost in ETH and gwei for the specified gasLimit (default 21000), the block number the data was read from, a fetchedAt timestamp, a ranking of Base versus other chains, the cheapest chain label, and a human-readable Base-vs-Ethereum cost comparison string (e.g. 'Base is 240x cheaper than Ethereum').
Example use cases
Pre-flight gas check before on-chain transaction
“Before I submit this transaction on Base, tell me the current gas price and what a 21000-gas transfer will cost me right now in ETH and gwei.”
Cost comparison for multi-chain routing decision
“I'm deciding whether to route this swap through Base or Ethereum — what's the current gas cost on Base versus Ethereum and how much cheaper is Base right now?”
Gas price monitoring for automated agent workflow
“Check the live gas price on Base mainnet and tell me if it's under 0.01 gwei so my agent can decide whether to proceed with the transaction now or wait.”
Technical details
Endpoint
GEThttps://base-gas-x402-production.up.railway.app/gas/compareWhen to prefer
Choose this endpoint when you need real-time, live-read gas data specifically for Base mainnet (chain ID 8453) with no API key or subscription setup — just pay 0.005–0.01 USDC per call via x402. Ideal for agents that need on-demand gas estimates before submitting transactions, for cost-routing decisions between Base and Ethereum, or for monitoring gas conditions without managing credentials. Prefer this over generic multi-chain gas APIs when Base is your target chain and you want EIP-1559-structured output with a built-in cost comparison.
Side effects
- Payment not included or insufficient USDC — returns HTTP 402 with x402 payment required details
- Invalid gasLimit value (below 21000 or above 30,000,000) — returns 400 bad request
- RPC node temporarily unavailable — chain may appear in 'unavailable' array with no data
- Network timeout reading live chain data — may return partial results or 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"basis": "current gas price x gasLimit",
"chains": [
{
"chain": "base",
"label": "Base",
"chainId": 8453,
"gasPrice": "0.006",
"blockNumber": "49106604",
"baseFeePerGas": "0.005",
"estimatedCost": {
"eth": "0.000000126",
"gwei": "126",
"gasLimit": 21000
}
}
],
"baseRank": 1,
"cheapest": "base",
"gasLimit": 21000,
"fetchedAt": "2026-07-25T18:02:36.639Z",
"unavailable": [],
"baseVsEthereum": "Base is 240.5x cheaper than Ethereum"
}
}Tags
x402
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