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Delx Commerce — EVM Gas Limit Headroom Check
x402
Delx Commerce — EVM Gas Limit Headroom Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Calculates whether a given gas limit provides sufficient headroom over an estimated gas cost for an EVM transaction, returning the headroom amount and 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 with: a boolean 'sufficient' indicating if the gas limit covers the estimate with adequate headroom, 'headroom_gas' (absolute gas units of headroom), 'headroom_fraction' (fraction of gas limit that is headroom), plus evidence fields including a SHA-256 hash of the input and confirmation of zero data retention and no external calls.
Example use cases
Pre-submission gas safety check
“I'm about to send an EVM transaction with a gas limit of 300000 and the estimated gas is 260000 — can you check if that limit gives me enough headroom and tell me the exact headroom fraction?”
Smart contract deployment buffer validation
“I'm deploying a contract and my gas estimate came back at 1800000. I set my gas limit to 2000000 — is that sufficient headroom, and how much gas room do I have?”
Automated agent transaction preflight
“Before my agent submits the next on-chain call, verify that a gas limit of 150000 is enough over an estimated 130000 gas and return whether it passes the headroom check.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-gas-limit-headroom?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, verifiable, zero-retention preflight check on EVM gas parameters before submitting a transaction. Prefer it over manual calculation when you need a cryptographic evidence receipt (input SHA-256) proving the check was performed honestly and without external data leakage, especially in automated agent workflows where auditability matters.
Side effects
- Missing or non-integer gas_limit or estimated_gas fields returns a validation error
- gas_limit of zero may cause divide-by-zero or undefined fraction
- estimated_gas exceeding gas_limit returns sufficient=false with negative or zero headroom
- Payment failure via x402 protocol blocks the request before computation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gas_limit | integer | Gas Limit supplied to EVM Gas Limit Headroom; used only for this bounded calculation and processed in memory without retention. |
| estimated_gas | integer | Estimated Gas supplied to EVM Gas Limit Headroom; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"sufficient": true,
"headroom_gas": 4200,
"headroom_fraction": 0.2
},
"schema": "delx/util-evm-gas-limit-headroom/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "dd71c79c3c5455d122b7167969700e4587770c75519ca55c82bfc04e7433381e",
"external_calls": 0
},
"operation": "evm_preflight:evm_gas_limit_headroom"
}
}Tags
x402
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