# Delx Commerce — EVM Fee Cap Order Check

> Delx Commerce — EVM Fee Cap Order 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).

Validates that max_fee_per_gas_wei is correctly ordered relative to max_priority_fee_per_gas_wei for an EVM transaction preflight check

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-fee-cap-order-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-evm-fee-cap-order-check-aee7ea4c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_STVCIEBfxeXcU3zjsm0IV

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability delx-commerce-evm-fee-cap-order-check-aee7ea4c -d '<json body>'
```

Example prompt: Before I submit this Ethereum transaction, check if my gas fee parameters are correctly ordered — my max fee per gas is 2000000000 wei and my max priority fee per gas is 100000000 wei.

## When to prefer this

Use this endpoint when an AI agent or automated wallet needs a lightweight, verifiable, pay-per-call preflight check that EVM gas fee parameters are sanely ordered (max_fee_per_gas >= max_priority_fee_per_gas) before broadcasting a transaction. Prefer it over manual in-code comparison when you need a cryptographically verifiable evidence receipt (SHA256 of inputs, zero external calls) and no data retention — particularly useful in trustless or auditable agent pipelines paying via USDC on Base or Solana through x402.

## Known failure modes

- Invalid or non-numeric wei string values cause rejection
- Missing required fields result in a validation error
- Values exceeding maxLength of 8192 characters are rejected
- Network or payment failure via x402 protocol prevents call completion

## 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 'ordered' field indicating if max_fee_per_gas_wei >= max_priority_fee_per_gas_wei, the echoed input values, a 'status' field ('pass' or 'fail'), an 'operation' identifier ('evm_preflight:evm_fee_cap_order_check'), a schema version string, and an evidence block with retained=false, an input SHA256 hash for verifiability, and external_calls count (always 0, computed fully in-memory).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "max_fee_per_gas_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "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": {
   "type": "string",
   "maxLength": 8192,
   "description": "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."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-fee-cap-order-check-aee7ea4c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)