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EVM Receipt Gas Variance Calculator
x402
EVM Receipt Gas Variance Calculator is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Computes the delta, direction, and fractional variance between actual gas used and estimated gas for an EVM transaction receipt.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Receipt Gas Variance: EVM Receipt Gas Variance compares gas used with a preflight estimate and reports variance from bounded caller-supplied values without an external provider. Call EVM Receipt Gas Variance 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 Receipt Gas Variance as versioned deterministic JSON. Pr…
Output
Returns a JSON object containing: delta_gas (integer difference between actual and estimated gas), under_estimate (boolean indicating whether the estimate was too low), and variance_fraction (float representing the proportional deviation). Also includes schema version, operation name, status, and an evidence block confirming no data retention and zero external calls.
Example use cases
Post-transaction gas audit
“My smart contract call just settled and it used 85,000 gas, but I had estimated 80,000 — can you calculate the variance fraction and tell me whether my estimate was too low?”
Gas estimator accuracy benchmarking
“I want to benchmark my gas estimator: actual gas used was 45,500 and my estimate was 50,000. What's the delta, was it an over-estimate, and what fraction off was I?”
Pre-deployment gas model validation
“Before I deploy my next contract, I want to validate my gas model — my simulation predicted 120,000 gas but the test receipt shows 126,000. Can you compute the variance so I know how much headroom to add?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-receipt-gas-varianceWhen to prefer
Choose this endpoint when you need a fast, stateless, in-memory computation of EVM gas variance after receiving a transaction receipt — particularly for preflight checks, gas model audits, or estimator benchmarking. Prefer it over manual calculation when you want a guaranteed schema-versioned, evidence-stamped result with no data retention, suitable for agent pipelines that must log provenance.
Side effects
- Missing required field (gas_used or estimated_gas) returns a validation error
- Non-integer values for gas fields cause schema rejection
- Zero estimated_gas causes division-by-zero or undefined variance_fraction
- Negative gas values may produce unexpected sign behavior
- Payment not included or insufficient USDC causes x402 payment-required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gas_used | integer | Gas Used supplied to EVM Receipt Gas Variance; used only for this bounded calculation and processed in memory without retention. |
| estimated_gas | integer | Estimated Gas supplied to EVM Receipt Gas Variance; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"delta_gas": 1000,
"under_estimate": true,
"variance_fraction": 0.04761904761904762
},
"schema": "delx/util-evm-receipt-gas-variance/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "a8bc5f5e6432a5c0ce8704795f333314b6d4458c5d628cf11f5e511b08a257c6",
"external_calls": 0
},
"operation": "evm_preflight:evm_receipt_gas_variance"
}
}Tags
x402
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