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EVM Fee History — Base Fee & Priority Fee
x402
EVM Fee History — Base Fee & Priority Fee is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-01).
Returns recent base-fee and priority-fee (tip) history for a specified EVM-compatible blockchain over a configurable number of blocks.
Price / call$0.004
Success—
StatusUnknown
How this service works
Recent base-fee and priority-fee history — Genesis402 / UnyKorn Operator Network
Output
A JSON response containing an ok flag, a type field set to 'evm-fee-history', a receipt object with transaction hash, USD amount charged, and receipt ID, plus a generated_at ISO8601 timestamp. The core fee history data (base fees and priority fees per block) is embedded in the response for the requested chain and block count.
Example use cases
DeFi transaction timing optimizer
“Fetch the last 50 blocks of base fee and priority fee history on Arbitrum — I want to know if fees are cheap enough to submit my swap right now or if I should wait.”
Cross-chain gas cost dashboard
“Pull recent fee history for both Base and Optimism for the past 20 blocks each so I can compare which chain has lower fees for my bridge transaction.”
Gas spike alerting for smart contract deployer
“Grab the last 100 blocks of base fee history on Ethereum — I'm trying to detect if there's been a fee spike in the last few minutes before I deploy my contract.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/evm-fee-history?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need structured, recent EVM fee history (both base fees and priority fees) across any of ten major chains in a single authenticated API call. It is ideal for agents that need to make gas-cost decisions, monitor fee volatility, or time transactions optimally. Prefer it over raw RPC calls when you want a unified, multi-chain interface without managing your own node connections or dealing with chain-specific RPC quirks.
Side effects
- Invalid or unsupported chain name returns an error — only the ten listed chains are accepted
- Requesting more blocks than available on the network may return partial data or an error
- Payment failure or insufficient balance results in a 402 response without data
- Network timeout or RPC node outage for the requested chain may return a 5xx error
- Malformed request body (missing required params) returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "evm-fee-history",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.25,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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