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Ontario Protocol Base Gas Fee Estimator
x402
Ontario Protocol Base Gas Fee Estimator is a paid API for AI agents from ontarioprotocol.com, paid per call via x402, $0.0015/call, status unknown (last checked 2026-10-30).
Returns live Base network gas fee data including base fee, priority fee percentiles, suggested maxFeePerGas/maxPriorityFeePerGas for slow/normal/fast inclusion, L1 data fee upper bound, and estimated total transaction costs in wei.
Price / call$0.0015
Success—
StatusUnknown
How this service works
What does a Base transaction cost right now? Base fee, priority-fee p25/p50/p90 over the last 20 blocks, suggested maxFeePerGas and maxPriorityFeePerGas for slow, normal and fast inclusion, an L1 data-fee upper bound, and estimated total cost in wei for an ETH transfer and an ERC-20 transfer, read live from Base RPC with the block number. $0.0015 USDC on Base. Failed read, no charge. No account, no API key. Estimates, not inclusion guarantees. By Ontario Protocol.
Output
A JSON object containing: the current block number, Base network identifier, timestamp, base fee in wei, priority fee p25/p50/p90 across sampled blocks, suggested maxFeePerGas and maxPriorityFeePerGas for slow/normal/fast inclusion, L1 data fee upper bound for ETH and ERC-20 transfers, estimated total transaction cost in wei for both transfer types, and the assumptions used in calculations (gas limits, formula, bytes). All wei amounts are returned as decimal strings.
Example use cases
Pre-flight cost check for ETH send
“Before I send ETH on Base, check the current gas fees and tell me the estimated total cost in wei for an ETH transfer and what maxFeePerGas I should set for normal inclusion.”
DeFi bot fee optimization
“My trading bot is about to submit a Base transaction — pull the latest gas fee percentiles and fast-inclusion fee suggestions so it can set an appropriate gas price right now.”
ERC-20 transfer cost estimation
“How much will an ERC-20 token transfer on Base cost me in total right now, including the L1 data fee? Sample the last 30 blocks for better accuracy.”
Technical details
Endpoint
GEThttps://ontarioprotocol.com/api/x402/base/gas?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need live, current Base network gas fee data with multi-tier inclusion speed suggestions (slow/normal/fast) and want both L1 and L2 fee components included in a single call. It is particularly useful for agents that need to set EIP-1559 gas parameters before submitting transactions, estimate transaction costs before execution, or display current network fee conditions to users. Prefer it over generic Ethereum gas endpoints because it is Base-specific and accounts for the L1 data fee component unique to Base as an L2.
Side effects
- Base RPC read failure — no charge, endpoint returns an error indicating the live data could not be fetched
- Invalid blocks parameter (outside 5–50 range) — likely returns a 400 or validation error
- Network connectivity issue to Base RPC — transient failure with no charge per stated policy
- Stale or delayed block data during high network congestion — estimates may lag slightly behind true mempool state
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"example": {
"note": "Estimates, not inclusion guarantees. Wei amounts are decimal strings.",
"block": 53049909,
"schema": "ontario.base_gas.v1",
"source": "Base RPC",
"network": "eip155:8453",
"read_at": "2026-10-25T00:46:05Z",
"suggested": {
"fast": {
"max_fee_per_gas": "15800000",
"max_priority_fee_per_gas": "5800000"
},
"slow": {
"max_fee_per_gas": "11000000",
"max_priority_fee_per_gas": "1000000"
},
"normal": {
"max_fee_per_gas": "11000000",
"max_priority_fee_per_gas": "1000000"
}
},
"assumptions": {
"base_fee": "base fee of the next block",
"blocks_sampled": 20,
"max_fee_formula": "2 * base_fee + priority_fee",
"estimate_formula": "gas * (base_fee + p50 tip) + L1 data-fee upper bound",
"eth_transfer_gas": 21000,
"erc20_transfer_gas": 65000,
"priority_fee_method": "median across the sampled blocks of each block's gas-weighted 25th, 50th and 90th percentile tip (eth_feeHistory)",
"eth_transfer_unsigned_tx_bytes": 110,
"erc20_transfer_unsigned_tx_bytes": 175
},
"base_fee_wei": "5000000",
"priority_fee_wei": {
"p25": "1000000",
"p50": "1000000",
"p90": "5800000"
},
"estimated_total_wei": {
"eth_transfer": "126389167165",
"erc20_transfer": "390565949161"
},
"l1_fee_upper_bound_wei": {
"eth_transfer": "389167165",
"erc20_transfer": "565949161"
},
"estimate_includes_l1_fee": true
}
}Tags
x402
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