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Gas Oracle – EIP-1559 Fee Estimator by Chain
x402
Gas Oracle – EIP-1559 Fee Estimator by Chain is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns current bid-ready EIP-1559 gas fees (slow/standard/fast) plus native-token USD costs for a specified blockchain
Price / call$0.001
Success—
StatusUnknown
How this service works
Current gas market for one chain — bid-ready EIP-1559 fees + USD costs
Output
A JSON object containing the current block number, baseFee in wei and gwei, projected nextBaseFee, priority fee percentiles over the last 20 blocks, three ready-to-use EIP-1559 fee tiers (slow/standard/fast) each with maxFeePerGas and maxPriorityFeePerGas in wei, native token USD price with Chainlink metadata, quick USD cost estimates, congestion indicators, legacy gas price in gwei, cache hit/miss/stale status, and a fetchedAt timestamp.
Example use cases
Real-time transaction cost estimation
“I'm about to send 10 ETH on Arbitrum. What's the current gas market looking like, and roughly how much will this transfer cost me in USD with standard fees?”
Multi-chain fee comparison for routing
“We need to route a settlement across Base, Optimism, or Polygon. Pull the current fast-tier EIP-1559 fees and USD costs for all three so we can pick the cheapest chain right now.”
Congestion-aware priority fee setting
“Check if Ethereum's gas market is congested at the moment. If it is, give me the fast-tier maxPriorityFeePerGas; if not, I'll use standard. Also tell me what the next block's base fee is expected to be.”
Technical details
Endpoint
GEThttps://x402.professorsausages.com/gas-oracle/:chainWhen to prefer
Use this endpoint when you need production-ready EIP-1559 gas fee parameters (maxFeePerGas and maxPriorityFeePerGas in wei) for constructing or estimating blockchain transactions, especially when you also need USD cost context via native token price from Chainlink. Prefer this over manual RPC calls when you want pre-computed slow/standard/fast tiers, next-block base fee projections, and congestion signals in a single call.
Side effects
- Unsupported chain name returns 404 or error response
- Chain RPC node unavailable causes fetch failure
- Stale cache served if upstream data is delayed
- Malformed chain parameter may return 400 bad request
- Rate limiting or payment failure returns 402 or 429
Tags
x402
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