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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 2026-09-14).
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
60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.
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
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/feesWhen 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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