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Delx Commerce — EVM Base Fee Growth Ceiling Calculator
x402
Delx Commerce — EVM Base Fee Growth Ceiling Calculator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Computes the maximum possible EVM base fee after a given number of blocks using the EIP-1559 growth formula, given a current base fee and growth fraction.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object containing the computed fee_ceiling_wei (the maximum possible base fee in wei after the specified number of blocks), the input block count, a status field ('pass'), an operation identifier, and an evidence object with a SHA-256 hash of the input, a flag confirming no data was retained, and a count of zero external calls made.
Example use cases
Transaction preflight fee budgeting
“Before I send this Ethereum transaction, calculate the worst-case base fee ceiling after 4 blocks given the current base fee of 2500000000 wei and a growth fraction of 0.125 — I want to make sure my gas budget covers it.”
Agent-scheduled DeFi transaction safety check
“My agent is about to execute a DeFi swap in 6 blocks. The current base fee is 800000000 wei and growth fraction is 0.125 — what's the maximum base fee it could face so it can set an appropriate max fee per gas?”
Gas spike risk assessment for batch operations
“I'm planning a batch of 10 EVM transactions over the next 5 blocks. Current base fee is 1500000000 wei with growth fraction 0.125 — can you compute the fee ceiling so I know the worst-case gas cost to budget for?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-base-fee-growth-ceiling?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, verifiable, pay-per-call computation of the EIP-1559 base fee ceiling with cryptographic evidence of no data retention and no external calls — ideal for EVM transaction preflight checks in autonomous agents that require auditability and no signup overhead.
Side effects
- Missing or invalid 'blocks' integer — returns error or unexpected result
- Invalid 'current_base_fee_wei' string (non-numeric or too large) — may return error
- Missing 'growth_fraction' parameter — computation may fail or return incorrect ceiling
- Payment failure via x402 protocol — 402 response if USDC payment is not attached
- Network timeout — service unavailable response
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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