# Delx Commerce — EVM Transaction Envelope Check

> Delx Commerce — EVM Transaction Envelope 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 EVM transaction envelope fields for a given transaction type, returning required fields, missing fields, and pass/fail status.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-tx-envelope-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-transaction-envelope-check-527e023c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LJwKvOzi445ly_Fpewp2L

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-transaction-envelope-check-527e023c -d '<json body>'
```

Example prompt: Check my EVM transaction envelope to make sure it has all the required fields — it's a type 2 transaction with fields chainId, nonce, maxFeePerGas, maxPriorityFeePerGas, and value — and tell me if anything is missing before I submit it.

## When to prefer this

Choose this endpoint when you need a fast, cheap, no-signup preflight check to validate an EVM transaction envelope before signing or broadcasting — especially when you want verifiable, in-memory-only processing with a cryptographic hash of the input for audit purposes. Prefer it over manual field checks or full RPC simulation when you only need field completeness validation for a known transaction type.

## Known failure modes

- Invalid or unsupported transaction_type integer returns an error or unexpected required_fields list
- Malformed fields object with non-object values may cause validation errors
- Missing fields object causes incomplete validation results
- Payment failure via x402 (insufficient USDC balance or unsupported chain) prevents the call from completing
- Network timeout returns no validation result

## 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 pass/fail status, a boolean valid flag, a list of required fields for the given transaction type, a list of any missing fields, the detected transaction type, and evidence metadata including a SHA-256 hash of the input and confirmation that no data is retained externally.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "fields": {
   "type": "object",
   "description": "Fields supplied to EVM Tx Envelope Check; used only for this bounded calculation and processed in memory without retention.",
   "maxProperties": 128,
   "additionalProperties": true
  },
  "transaction_type": {
   "type": "integer",
   "description": "Transaction Type supplied to EVM Tx Envelope Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "valid": true,
   "missing_fields": [],
   "required_fields": [
    "chainId",
    "maxFeePerGas",
    "maxPriorityFeePerGas",
    "nonce"
   ],
   "transaction_type": 2
  },
  "schema": "delx/util-evm-tx-envelope-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "847b54b0f549ee1ab246ef64c6b6670897f880fa285f91e0f08548bfdd9814d7",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_tx_envelope_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-transaction-envelope-check-527e023c/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)