# Delx Commerce EVM Batch Duplicate Nonce Check

> Delx Commerce EVM Batch Duplicate Nonce 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).

Checks a batch of up to 256 EVM nonces for duplicates, returning which nonces appear more than once — useful as a pre-flight validation before submitting EVM transactions.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-batch-duplicate-nonce-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-batch-duplicate-nonce-check-c169a641
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e3YpchR0jXl8-swaNkz-Q

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-batch-duplicate-nonce-check-c169a641 -d '<json body>'
```

Example prompt: Check these nonces for duplicates before I submit my EVM batch: [3, 7, 11, 11, 22, 3] — I need to know if any repeat and which ones they are.

## When to prefer this

Choose this endpoint when you need a fast, cheap, privacy-preserving pre-flight check for EVM nonce uniqueness before submitting a batch of transactions. It processes data in-memory without retention, provides a verifiable input hash, and charges only $0.001 USDC per call — ideal for automated agents that need lightweight transaction validation without running the check locally.

## Known failure modes

- Array exceeds 256 items — request rejected
- Non-integer values in nonce array — validation error
- Empty nonce array — may return trivially unique result
- Malformed JSON body — 400 bad request
- Payment not included or insufficient — 402 payment required

## 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 indicating whether all nonces in the batch are unique (unique: true/false), a list of any duplicate nonce values found, the operation name, a status field, and evidence metadata including whether inputs were retained (always false) and a SHA-256 hash of the input for verifiability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "nonces": {
   "type": "array",
   "items": {
    "type": "integer"
   },
   "maxItems": 256,
   "description": "Nonces supplied to EVM Batch Duplicate Nonce Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "unique": false,
   "duplicate_nonces": [
    11
   ]
  },
  "schema": "delx/util-evm-batch-duplicate-nonce-check/v1",
  "status": "advisory",
  "evidence": {
   "retained": false,
   "input_sha256": "93258878a4b3e2c7cf1c455a9ed9b67ff3017ff1d070d0d1a079a29ac92b1af4",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_batch_duplicate_nonce_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-batch-duplicate-nonce-check-c169a641/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)