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Delx EVM Fee Cap Order Check
x402
Delx EVM Fee Cap Order Check 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).
Validates that EVM gas fee parameters are correctly ordered (max_fee_per_gas >= max_priority_fee_per_gas) for preflight transaction checks.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Fee Cap Order Check: EVM Fee Cap Order Check checks that the priority fee cap does not exceed the total fee cap from bounded caller-supplied values without an external provider. Call EVM Fee Cap Order Check 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 Fee Cap Order Check as versioned deterministic JSON. Pric…
Output
Returns a JSON object indicating whether the fee parameters are correctly ordered (ordered: true/false), echoes back the provided wei values, a status field ('pass' or 'fail'), and an evidence block confirming no data retention and no external calls were made.
Example use cases
Transaction preflight gas validation
“I'm about to broadcast an EVM transaction with a max fee per gas of 5000000000 wei and a max priority fee per gas of 1500000000 wei — can you run a preflight check to make sure those fee values are in the correct order?”
Debugging invalid gas fee ordering
“My agent got an error saying the gas fee params are wrong on this Ethereum tx. The max fee per gas wei is 100000000 and max priority fee per gas wei is 2000000000 — can you check if they're in the right order?”
Automated on-chain workflow fee guard
“Before my agent submits any EVM transaction, I want it to verify the gas fee order is valid — max fee per gas is 3000000000 wei and max priority fee per gas is 200000000 wei. Can you confirm this passes the fee cap order check?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-fee-cap-order-checkWhen to prefer
Choose this endpoint when you need a lightweight, stateless, in-memory preflight check to confirm EVM gas fee ordering correctness before broadcasting a transaction. It is ideal when you need an auditable evidence trail (including input hash and zero data retention guarantees) and want a simple pass/fail check rather than full gas estimation or simulation.
Side effects
- Invalid or non-numeric wei string values cause parsing errors
- max_priority_fee_per_gas_wei greater than max_fee_per_gas_wei returns ordered: false with a fail status
- Missing required fields result in a validation error response
- Malformed JSON body returns an HTTP 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| max_fee_per_gas_wei | string | Max Fee Per Gas Wei supplied to EVM Fee Cap Order Check; used only for this bounded calculation and processed in memory without retention. |
| max_priority_fee_per_gas_wei | string | Max Priority Fee Per Gas Wei supplied to EVM Fee Cap Order Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"ordered": true,
"max_fee_per_gas_wei": "2000000000",
"max_priority_fee_per_gas_wei": "100000000"
},
"schema": "delx/util-evm-fee-cap-order-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "b04dce361f99458031086c658ad3571d192c3729ea28ea2ccad5d3960a15eaf2",
"external_calls": 0
},
"operation": "evm_preflight:evm_fee_cap_order_check"
}
}Tags
x402
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