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EVM Base Fee Growth Ceiling Calculator
x402
EVM Base Fee Growth Ceiling Calculator is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes the maximum base fee in wei that an EVM network could reach after a given number of blocks, given a fractional growth rate and starting base fee.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Base Fee Growth Ceiling: EVM Base Fee Growth Ceiling compounds a caller growth fraction across future blocks from bounded caller-supplied values without an external provider. Call EVM Base Fee Growth Ceiling before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Base Fee Growth Ceiling as versioned deterministic JSON.…
Output
Returns a JSON object containing the computed fee_ceiling_wei (the maximum base fee in wei after the specified number of blocks), the number of blocks used in the calculation, the operation name, status (pass/fail), and an evidence block confirming no data was retained and no external calls were made.
Example use cases
Pre-flight gas budget for batch transactions
“Before I submit 20 transactions on-chain, calculate the base fee ceiling starting at 800000000 wei with a 12.5% growth fraction over 5 blocks so I know the worst-case gas cost I'm committing to.”
DeFi bot fee guardrail check
“My DeFi agent is about to execute an arbitrage — can you compute the max base fee ceiling it could hit if it waits 6 blocks, starting from 1500000000 wei current base fee with a growth fraction of 0.125?”
Smart contract deployment cost modeling
“I'm planning a smart contract deployment and want to model the worst-case base fee over the next 10 blocks. Current base fee is 2000000000 wei and the EVM growth fraction is 0.125 — what's the fee ceiling?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-base-fee-growth-ceilingWhen to prefer
Use this endpoint when you need a deterministic, in-memory computation of the EVM base fee ceiling with no external calls or data retention — ideal for agent preflighting before submitting EVM transactions, budgeting gas costs in DeFi bots, or modeling worst-case fee scenarios for smart contract workflows. Prefer this over off-chain estimates when you need a provable, auditable result with an input hash in the evidence block.
Side effects
- Missing or invalid blocks integer — returns validation error
- Invalid growth_fraction (e.g. negative or >1 without clear context) — may return error or unexpected result
- current_base_fee_wei exceeds maxLength of 8192 characters — rejected at schema level
- Malformed JSON body — HTTP 400 or schema validation failure
- Payment not attached (x402 protocol) — returns HTTP 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| blocks | integer | Blocks supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention. |
| growth_fraction | number | Growth Fraction supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention. |
| current_base_fee_wei | string | Current Base Fee Wei supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"blocks": 3,
"fee_ceiling_wei": "1423828125"
},
"schema": "delx/util-evm-base-fee-growth-ceiling/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "e6331adf36b1a6016a316e2580f099fd04ebb97045f034d65e705d7114cceb67",
"external_calls": 0
},
"operation": "evm_preflight:evm_base_fee_growth_ceiling"
}
}Tags
x402
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