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EVM Gas Cost Ceiling Calculator
x402
EVM Gas Cost 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 possible gas cost (fee ceiling) in wei for an EVM transaction given a gas limit and max fee per gas, without retaining any input data.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Gas Cost Ceiling: EVM Gas Cost Ceiling calculates a worst-case native fee from gas limit and fee cap from bounded caller-supplied values without an external provider. Call EVM Gas Cost 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 Gas Cost Ceiling as versioned deterministic JSON. Price: $0.001 USDC vi…
Output
Returns a JSON object containing the computed fee ceiling in wei, the echoed gas limit, a SHA-256 hash of the inputs for auditability, confirmation that no data was retained, and a count of zero external calls — providing a tamper-evident, bounded gas cost estimate.
Example use cases
Preflight check before ETH transfer
“I'm about to send an ETH transfer with a gas limit of 21000 and a max fee per gas of 2000000000 wei — what's the absolute maximum this transaction could cost me in wei?”
DeFi swap max fee budgeting
“My DeFi swap uses a gas limit of 150000 and I've set max fee per gas at 5000000000 wei. Can you calculate the gas cost ceiling so I know if I have enough ETH to cover the worst case?”
Agent transaction safety guard
“Before my agent submits any on-chain call, check that the gas cost ceiling for a gas limit of 80000 and max fee per gas of 3500000000 wei stays within acceptable bounds.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-gas-cost-ceilingWhen to prefer
Use this endpoint when an AI agent needs a safe, auditable, stateless upper-bound on EVM transaction fees before submitting on-chain — especially when you need evidence of no data retention (via SHA-256 input hash and retained:false flag). Prefer over on-chain gas estimation RPC calls when you want a simple, paid, governed micro-service with no external calls and verifiable evidence.
Side effects
- Missing or invalid gas_limit integer returns a validation error
- max_fee_per_gas_wei exceeding string length of 8192 characters is rejected
- Non-numeric or malformed max_fee_per_gas_wei string causes a parse error
- Extremely large values may produce arithmetic overflow errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gas_limit | integer | Gas Limit supplied to EVM Gas Cost Ceiling; used only for this bounded calculation and processed in memory without retention. |
| max_fee_per_gas_wei | string | Max Fee Per Gas Wei supplied to EVM Gas Cost Ceiling; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"gas_limit": 21000,
"fee_ceiling_wei": "42000000000000"
},
"schema": "delx/util-evm-gas-cost-ceiling/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "19061cf987ca5901459acb5789767ddf5192ab7d107094a556164762a62044c7",
"external_calls": 0
},
"operation": "evm_preflight:evm_gas_cost_ceiling"
}
}Tags
x402
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