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Seneschal Fee History Export
x402
Seneschal Fee History Export is a paid API for AI agents from api.seneschal.space, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Returns per-block Ethereum base fee and blob fee history (up to 1024 blocks) as CSV or JSON lines, sourced directly from eth_feeHistory consensus data
Price / call$0.05
Success—
StatusUnknown
How this service works
Per-block base-fee + blob-fee history export — the top-requested feed on the Seneschal data board. Up to 1024 blocks per call (?blocks=, default 300) straight from consensus via eth_feeHistory, as CSV or JSON lines (?format=csv|jsonl). Columns: block, base fee (wei + gwei), gas_used_ratio, blob base fee, blob_gas_used_ratio. Page backwards with ?newest=<block>; headers carry the consensus next-block projection. Live "gas right now" fact: GET /v1/q/base-fee ($0.001).
Output
A CSV or JSONL file with one row per block containing: block number, base fee in wei, base fee in gwei, gas_used_ratio, blob base fee, and blob_gas_used_ratio. Response headers include the consensus next-block base fee projection. Up to 1024 rows per call; paginate backwards using the oldest_block-1 as the `newest` parameter on the next call.
Example use cases
Example prompt
“Pull me the last 500 blocks of Ethereum base fee and blob fee history in CSV format — I want block number, base fee in gwei, gas used ratio, blob base fee, and blob gas used ratio.”
Technical details
Endpoint
GEThttps://api.seneschal.space/v1/premium/fee-history.csvWhen to prefer
Use this endpoint when you need bulk historical Ethereum fee data (base fee + blob fee) for multiple blocks in a single call, especially when you want CSV or JSONL output ready for analysis or storage. Prefer this over a single-block lookup when you need trend analysis, charting, or archiving. It is the canonical feed on Seneschal for fee history and supports pagination for walking further back in history.
Side effects
- blocks parameter out of range (>1024 or <1) — likely 400 error
- invalid block number passed to `newest` — bad request
- payment not included or insufficient — 402 Payment Required
- service unavailable or consensus node unreachable — 503
- requesting a block range far in the past that exceeds node history — partial or empty response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": "block,base_fee_wei,base_fee_gwei,gas_used_ratio,blob_base_fee_wei,blob_base_fee_gwei,blob_gas_used_ratio\n23012001,747213960,0.74721396,0.4993,1,0.000000001,0.25\n"
}Tags
x402
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