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Delx Commerce EVM Batch Duplicate Nonce Check
x402
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.
Price / call$0.001
Success—
StatusUnknown
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.
Example use cases
Pre-flight nonce check before batch send
“Before I broadcast this batch of 50 EVM transactions, check these nonces for duplicates: [0, 1, 2, 3, 4, 5, 3, 7] — tell me if any repeat and which ones so I can fix them first.”
Automated agent transaction validation
“My agent just queued up nonces [10, 20, 30, 40, 20, 50] for a multi-step EVM operation — verify there are no duplicate nonces in that list before it submits anything.”
Debugging a failed batch submission
“My last EVM batch failed and I suspect duplicate nonces — can you check this list [100, 101, 102, 100, 103, 102] and tell me exactly which nonces appeared more than once?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-batch-duplicate-nonce-check?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| nonces | array | Nonces supplied to EVM Batch Duplicate Nonce Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"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"
}
}Tags
x402
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