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EVM Batch Duplicate Nonce Check
x402
EVM Batch Duplicate Nonce Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Checks an array of EVM transaction nonces for duplicates and returns which nonces appear more than once.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Batch Duplicate Nonce Check: EVM Batch Duplicate Nonce Check finds duplicate nonces inside a caller-supplied transaction batch from bounded caller-supplied values without an external provider. Call EVM Batch Duplicate Nonce 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 Batch Duplicate Nonce Check as ver…
Output
Returns a JSON object indicating whether all nonces are unique (boolean 'unique' field), and an array 'duplicate_nonces' listing any integer nonces that appear more than once in the input. Also includes operation metadata such as whether input was retained (always false) and an input SHA-256 hash for auditability.
Example use cases
Pre-submission EVM batch preflight
“I'm about to send a batch of 50 EVM transactions. Can you check these nonces for duplicates before I submit them on-chain: [1, 2, 3, 4, 2, 7, 8, 9, 7]?”
Debugging failed batch transaction
“My batch transaction failed and I suspect a nonce collision. Can you scan this list of nonces and tell me which ones are duplicated: [100, 101, 102, 100, 103, 101]?”
Agent-generated nonce deduplication audit
“My agent just generated a set of nonces for a multicall batch — please verify there are no duplicates in this list before I proceed: [0, 1, 2, 3, 4, 5, 0, 6].”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-batch-duplicate-nonce-checkWhen to prefer
Use this endpoint when you need a fast, in-memory, privacy-preserving check for duplicate nonces across a batch of EVM transactions before submission. Prefer it over manual deduplication logic in your agent when you need an auditable preflight step with input hashing and a clear advisory status. Ideal for batch transaction pipelines, multicall builders, or any workflow where nonce uniqueness is a safety requirement.
Side effects
- Array exceeds 256-item limit — request rejected
- Non-integer values in nonce array cause validation error
- Empty array input may return trivially unique result
- Malformed JSON body returns 400 error
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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