Delx Commerce — Webhook Signature Timestamp Check

x402

Delx Commerce — Webhook Signature Timestamp Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Validates whether a webhook signature timestamp falls within an acceptable age and future-skew window, returning pass/fail with computed age in seconds.

Price / call$0.001

Seller volume →—

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 computed age_seconds between the two timestamps, a within_window boolean indicating whether the timestamp is acceptable, a signature_verified boolean, an overall status of 'pass' or 'fail', and an evidence object with a SHA-256 hash of the input and confirmation that no data was retained and no external calls were made.

Example use cases

Replay attack prevention for webhooks

“I just received a webhook with a signature timestamp of 1717000000 and the current time is 1717000120. Check if it's within a 5-minute max age and 60-second future skew window so I know it's not a replay attack.”

Webhook freshness check before processing

“Before I process this incoming webhook, verify its timestamp — the webhook timestamp is 1716999800, now is 1717000000, max age allowed is 180 seconds, and max future skew is 30 seconds. Is it fresh enough?”

Automated webhook validation in agent pipeline

“My agent pipeline received a webhook at epoch 1717005000 and the current epoch is 1717005050. Validate the timestamp with a 120-second max age and 10-second future skew limit so I can decide whether to accept or reject it.”

Technical details

Endpoint

POSThttps://commerce.delx.ai/api/v1/x402/webhook-signature-timestamp-check?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a lightweight, pay-per-call, no-signup webhook timestamp validator with cryptographic evidence of computation (SHA-256 input hash) and explicit confirmation of no data retention. It is ideal for agent pipelines that need to programmatically verify webhook freshness and replay-attack windows without standing up their own time-window logic, and where verifiable, auditable delivery via USDC micropayment is preferred over a subscription API.

Side effects

Missing required fields (now_epoch, timestamp_epoch, maximum_age_seconds, maximum_future_skew_seconds) result in validation error
Non-integer epoch values cause schema rejection
Timestamp too old — age_seconds exceeds maximum_age_seconds, within_window returns false, status fails
Timestamp too far in the future — exceeds maximum_future_skew_seconds, within_window returns false
Payment failure via x402 protocol blocks the call entirely

Input

Schema · Request body

Field	Type	Description
now_epoch	integer	Now Epoch supplied to Webhook Signature Timestamp Check; used only for this bounded calculation and processed in memory without retention.
timestamp_epoch	integer	Timestamp Epoch supplied to Webhook Signature Timestamp Check; used only for this bounded calculation and processed in memory without retention.
maximum_age_seconds	integer	Maximum Age Seconds supplied to Webhook Signature Timestamp Check; used only for this bounded calculation and processed in memory without retention.
maximum_future_skew_seconds	integer	Maximum Future Skew Seconds supplied to Webhook Signature Timestamp Check; used only for this bounded calculation and processed in memory without retention.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "result": {
      "age_seconds": 120,
      "within_window": true,
      "signature_verified": false
    },
    "schema": "delx/util-webhook-signature-timestamp-check/v1",
    "status": "pass",
    "evidence": {
      "retained": false,
      "input_sha256": "399247a496498846768188f051c797a1de4857867f694fadcc7a0037c29feb35",
      "external_calls": 0
    },
    "operation": "web_reliability:webhook_signature_timestamp_check"
  }
}

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