L1 data fee estimate for Optimism, Base, Blast and Unichain from the GasPriceOra
L1 data fee estimate for Optimism, Base, Blast and Unichain from the GasPriceOracle, the part of an L2 transaction cost that gas estimates leave out.
Answeringour last check, 2026-10-21
1 of 1checks answered this week
278 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://saylorinnovations.com/api/chain/l1-fee
| Category | Everything else |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.01 | 278 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"calldata_bytes": "100",
"chain": "base"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"calldata_bytes": {
"description": "optional calldata size in bytes for a typical transaction, 0 to 20000 (default 100)",
"type": "string"
},
"chain": {
"description": "optimism, base, blast or unichain (or chain id)",
"type": "string"
}
},
"required": [
"chain"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"chain": {
"description": "the chain name that was queried",
"type": "string"
},
"chain_id": {
"description": "EIP-155 chain id of that network",
"type": "number"
},
"estimated_for": {
"description": "what the estimate is for",
"type": "string"
},
"l1_base_fee_gwei": {
"description": "L1 base fee seen by the oracle, gwei",
"type": [
"number",
"null"
]
},
"l1_data_fee_native": {
"description": "L1 data fee in the native currency",
"type": "number"
},
"l1_data_fee_wei": {
"description": "L1 data fee in wei",
"type": "string"
},
"l2_gas_price_gwei": {
"description": "current L2 gas price in gwei",
"type": [
"number",
"null"
]
},
"native_symbol": {
"description": "native currency of the chain",
"type": "string"
},
"note": {
"description": "plain-language reading of the result",
"type": "string"
},
"source": {
"description": "where the data was read from or how it was computed",
"type": "string"
}
},
"required": [
"chain",
"chain_id",
"estimated_for",
"l1_data_fee_native",
"note",
"source"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}