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Blockchain Fee History API
x402
Blockchain Fee History API is a paid API for AI agents from biosfera.46-62-215-147.sslip.io, paid per call via x402, $0.0015/call, status unknown (last checked 2026-10-01).
Returns recent base fees, gas used ratios, and 25/50/75 percentile priority fee tips (in gwei) for the last N blocks on Base, Ethereum, Arbitrum, Optimism, or Polygon.
Price / call$0.0015
Success—
StatusUnknown
How this service works
Use when you need recent base fees and priority fee percentiles on Base, Ethereum, Arbitrum, Optimism or Polygon to pick a fee: returns the last N blocks (1 to 20) with base fee, gas used ratio and 25/50/75 percentile tips in gwei.
Output
A list of up to 20 recent blocks, each containing the base fee (in gwei), gas used ratio, and 25th/50th/75th percentile priority fee tips (in gwei), for the requested EVM-compatible chain.
Example use cases
Optimal gas fee for DeFi transaction
“I'm about to send a transaction on Base — can you pull the last 10 blocks of fee history and tell me what priority tip I should use based on the 50th percentile?”
Compare fee trends across chains
“Show me the base fee and gas used ratio for the last 15 blocks on Arbitrum and Optimism so I can decide which chain is cheaper to use right now.”
Automated fee estimation for wallet app
“Fetch the fee history for the last 20 blocks on Polygon and give me the 25th, 50th, and 75th percentile priority tips in gwei so I can recommend a fee tier to my user.”
Technical details
Endpoint
GEThttps://biosfera.46-62-215-147.sslip.io/o/fee-history?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need historical fee context — multiple blocks of base fee trends and priority fee percentile distributions — rather than just a single current gas price snapshot. It is ideal for fee estimation logic, dynamic tip selection, or analytics dashboards across Base, Ethereum, Arbitrum, Optimism, or Polygon.
Side effects
- Invalid or unsupported chain name returns an error
- blocks parameter out of range (below 1 or above 20) returns a validation error
- RPC node unavailability for the requested chain may cause a timeout or 503 error
- Missing required 'chain' query parameter returns a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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