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EIP-1559 Fee Suggestion
x402
EIP-1559 Fee Suggestion is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-27).
Returns suggested maxFeePerGas and maxPriorityFeePerGas at slow, normal, and fast percentiles derived from the last 20 blocks of real fee history, plus the current base fee.
Price / call$0.005
Success—
StatusUnknown
How this service works
Suggested maxFeePerGas and maxPriorityFeePerGas from the last 20 blocks of real fee history, at slow, normal and fast percentiles. Beats guessing a gas price and getting stuck in the mempool. Via eth_feeHistory.
Output
A JSON object containing three fee tiers (slow, normal, fast), each with maxFeePerGas and maxPriorityFeePerGas in wei as strings, plus a top-level baseFeeWei field reflecting the current base fee derived from the last 20 blocks of on-chain fee history.
Example use cases
Pre-flight check before sending ETH
“Before I broadcast this Ethereum transfer, what's a reasonable maxFeePerGas and priority fee to use right now so it confirms at normal speed without getting stuck?”
Choosing fast lane for urgent DeFi trade
“I need to submit a DeFi swap urgently — what are the fast-percentile maxFeePerGas and maxPriorityFeePerGas values based on recent blocks so I can prioritize my transaction?”
Displaying gas tiers in wallet UI
“Show me the slow, normal, and fast EIP-1559 fee suggestions from recent block history so I can display three gas speed options to the user before they confirm their transaction.”
Technical details
Endpoint
GEThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/fees?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need EIP-1559-compatible fee parameters (maxFeePerGas + maxPriorityFeePerGas) grounded in real recent block history rather than a single gas price guess. It is ideal for agents building or broadcasting transactions on Base, Ethereum, Polygon, Arbitrum, or Optimism who want tiered slow/normal/fast options without implementing eth_feeHistory parsing themselves.
Side effects
- RPC node unavailable or rate-limited — may return 5xx or empty response
- Chain congestion causing fee history to be unusually volatile, making percentile suggestions less reliable
- No required parameters means little room for input errors, but stale data is possible if the upstream node lags
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | base | ethereum | polygon | arbitrum | optimism. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| normal | object | |
| baseFeeWei | string |
Tags
x402
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