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Delx Commerce — EVM Nonce Replace Check
x402
Delx Commerce — EVM Nonce Replace 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 whether a proposed EVM transaction nonce targets any pending (stuck) nonces, enabling safe nonce replacement decisions before transaction submission.
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 containing the proposed nonce value, a boolean flag indicating whether it targets any pending nonce (targets_pending), a status field ('pass'), and an evidence object with a SHA256 hash of the inputs and confirmation that no data was retained and no external calls were made.
Example use cases
Unsticking a pending EVM transaction
“I have stuck pending transactions with nonces 5, 6, and 7 on EVM — check if using proposed nonce 6 would target one of those so I can safely replace it.”
Preflight check before gas-bumped resend
“Before I rebroadcast with a higher gas price, verify that my proposed nonce 42 actually targets one of my stuck pending nonces [40, 41, 42] so I don't accidentally skip a slot.”
Agent transaction queue management
“My agent has pending nonces [100, 101, 103] queued up — does proposed nonce 101 target any of them? I need to know before deciding whether to replace or cancel.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-nonce-replace-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or wallet automation system needs to perform a zero-knowledge, verifiable preflight check before broadcasting a nonce-replacement EVM transaction. It is ideal when you need cryptographic evidence (SHA256 of inputs) that the check was performed without data retention or external calls — useful in auditable, trust-minimized agent pipelines. Prefer this over on-chain lookups when you need a fast, cheap ($0.001 USDC), off-chain computation with verifiable delivery guarantees via x402.
Side effects
- Input array exceeds 256 items (maxItems constraint violated)
- Non-integer nonce values cause schema validation failure
- Missing required fields result in 400 Bad Request
- Payment not included or insufficient USDC results in 402 Payment Required
- Network timeout if Base or Solana payment rails are congested
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| pending_nonces | array | Pending Nonces supplied to EVM Nonce Replace Check; used only for this bounded calculation and processed in memory without retention. |
| proposed_nonce | integer | Proposed Nonce supplied to EVM Nonce Replace Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"proposed_nonce": 11,
"targets_pending": true
},
"schema": "delx/util-evm-nonce-replace-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "a3ab4cbc105327ec6bf99174fcfd83de2a8605ff927d8cd849aed39cba23d03e",
"external_calls": 0
},
"operation": "evm_preflight:evm_nonce_replace_check"
}
}Tags
x402
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