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Delx EVM EIP-1559 Fee Check
x402
Delx EVM EIP-1559 Fee Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates EIP-1559 transaction fee parameters (gas limit, max fee per gas, max priority fee per gas) and computes ceiling values for EVM preflight checks.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Eip1559 Fee Check: EVM Eip1559 Fee Check checks dynamic-fee caps and calculates the worst-case transaction fee from bounded caller-supplied values without an external provider. Call EVM Eip1559 Fee 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 Eip1559 Fee Check as versioned deterministic JSON. Price: $0…
Output
Returns a JSON object with: fee_ceiling_wei (maximum possible transaction fee in wei), priority_fee_ceiling_wei (maximum priority fee in wei), fee_caps_ordered (boolean indicating whether max_fee >= max_priority_fee), and an overall status ('pass' or 'fail'). Also includes evidence metadata confirming no external calls were made and inputs were not retained.
Example use cases
Preflight EVM transaction fee validation
“I'm about to send an EVM transaction with a gas limit of 21000, max fee per gas of 2000000000000 wei, and max priority fee of 100000000000 wei — can you verify these fee parameters are valid and give me the fee ceiling before I broadcast it?”
DeFi agent gas safety check
“My DeFi agent is about to submit a smart contract interaction with gas limit 150000, max fee per gas 50000000000 wei, and max priority fee 1500000000 wei. Run a preflight fee check to confirm the caps are ordered correctly and compute the fee ceiling in wei.”
Detect misconfigured transaction fees
“I think my transaction builder might have the max fee and max priority fee in the wrong order — can you check: gas limit 80000, max fee per gas 3000000000 wei, max priority fee 5000000000 wei? I need to know if the fee caps are valid before submitting.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-eip1559-fee-checkWhen to prefer
Use this endpoint when you need a fast, cheap, privacy-preserving preflight validation of EIP-1559 fee parameters before submitting an EVM transaction. Prefer this over on-chain or RPC-based fee checks when you want deterministic, in-memory computation with no external blockchain calls and a guaranteed evidence trail. Ideal for AI agents building or reviewing EVM transactions programmatically.
Side effects
- Invalid or non-numeric wei string values may cause parsing errors
- Gas limit of zero or negative may produce invalid calculations
- Missing required fields returns a validation error
- Malformed JSON request body returns a 400-level error
- max_priority_fee_per_gas_wei exceeding max_fee_per_gas_wei results in fee_caps_ordered=false (not a hard error, but a failed check)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gas_limit | integer | Gas Limit supplied to EVM Eip1559 Fee Check; 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 Eip1559 Fee 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 Eip1559 Fee Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"fee_ceiling_wei": "42000000000000",
"fee_caps_ordered": true,
"priority_fee_ceiling_wei": "2100000000000"
},
"schema": "delx/util-evm-eip1559-fee-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "09e6859a0243cf6df6f99d660a7735e0bfb2893802645cebf1d03fa659f21a65",
"external_calls": 0
},
"operation": "evm_preflight:evm_eip1559_fee_check"
}
}Tags
x402
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