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Saylor Innovations Data Desk – EVM Gas Fee History
x402
Saylor Innovations Data Desk – EVM Gas Fee History is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Returns base fee, block fullness, and priority tip percentiles for up to 100 recent blocks across 16 EVM-compatible chains
Price / call$0.01
Success—
StatusUnknown
How this service works
Gas fee history for 16 EVM chains over up to 100 recent blocks: base fee, block fullness and priority tip at chosen percentiles for each block.
Output
A JSON object containing the chain name, chain ID, number of blocks analyzed, next-block base fee estimate (gwei), average base fee (gwei), and a per-block history array (oldest first) where each entry includes the block number, base fee, gas used ratio, and priority tip at the 10th, 50th, and 90th percentiles. Also includes a plain-language 'note' field summarizing the result and a 'source' field indicating the data origin.
Example use cases
Optimal transaction timing on Ethereum
“I want to time my Ethereum transaction to land when gas is cheap — can you pull the base fee and block fullness for the last 100 blocks so I can see if fees are trending down?”
DeFi bot gas cost estimation
“My trading bot needs to know the 10th and 90th percentile priority tips on Base for the last 20 blocks so it can set a competitive but not wasteful max fee — can you fetch that?”
Multi-chain gas comparison
“Can you grab the average base fee and recent block fullness for Optimism and Polygon over the last 30 blocks each? I'm trying to figure out which chain is cheaper to deploy on right now.”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/chain/fee-history?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need per-block granularity of EVM gas fee data across multiple chains without setting up your own RPC connections. It covers 16 chains in one unified API, returns structured gwei values with percentile tips, and includes a plain-language interpretation — making it ideal for AI agents that need to reason about gas costs, time transactions, or compare chains without parsing raw RPC output.
Side effects
- Unknown or unsupported chain name/ID returns an error — use one of the 16 supported chain names or their EIP-155 chain ID
- Blocks value out of range (less than 1 or greater than 100) returns a validation error
- RPC node unavailability for a specific chain may cause a null or partial history response
- Missing required 'chain' query parameter returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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