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Delx EVM Gas Limit Headroom
x402
Delx EVM Gas Limit Headroom is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Computes whether a given gas limit provides sufficient headroom over an estimated gas usage, returning the surplus gas amount and fraction.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Gas Limit Headroom: EVM Gas Limit Headroom calculates gas-limit headroom above an estimated gas amount from bounded caller-supplied values without an external provider. Call EVM Gas Limit Headroom 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 Limit Headroom as versioned deterministic JSON. Price: $0.001 U…
Output
Returns a JSON object indicating whether the gas limit is sufficient (boolean), the absolute headroom in gas units, and the headroom as a fraction of the gas limit. Also includes audit evidence fields confirming no data retention and no external calls were made.
Example use cases
Transaction preflight gas safety check
“I'm about to send an EVM transaction with a gas limit of 50000 and my gas estimator says it'll use about 42000 — can you verify there's enough headroom and tell me the exact surplus?”
Smart contract deployment buffer validation
“My smart contract deployment is estimated to consume 180000 gas and I've set a limit of 210000 — run a preflight check to confirm I have sufficient headroom and what fraction is left.”
Agent batch transaction gas guard
“Before my agent submits these calls, check if a gas limit of 75000 covers an estimated 71000 gas usage — I need to know if it's sufficient and how much gas is left as buffer.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-gas-limit-headroomWhen to prefer
Use this endpoint when an AI agent needs a lightweight, stateless preflight check to confirm an EVM transaction's gas limit safely covers the estimated gas before submission. It is ideal for automated agent pipelines that must guard against out-of-gas failures without building custom arithmetic. Prefer this over manual calculation when you need a structured, auditable result including the headroom fraction and a confirmation that no data is retained.
Side effects
- Missing or non-integer gas_limit or estimated_gas values cause validation errors
- Estimated gas exceeding gas limit returns sufficient: false with negative or zero headroom
- Malformed request body returns HTTP 400 or similar client error
- Payment failure via x402 protocol results in 402 response before computation occurs
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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