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X402 Payment Deadline Check
x402
X402 Payment Deadline Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).
Validates whether a payment authorization deadline falls within acceptable time bounds relative to a caller-supplied current time and lead-second constraints.
Price / call$0.001
Success—
StatusUnknown
How this service works
X402 Payment Deadline Check: X402 Payment Deadline Check checks payment authorization deadline against caller time budgets from bounded caller-supplied values without an external provider. Call X402 Payment Deadline Check before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Payment Deadline Check as ver…
Output
Returns an explicit acceptance or rejection status for the deadline, along with contract-specific validation checks, normalized evidence derived from the provided timestamps, and a list of mismatch reasons explaining why the deadline was accepted or rejected.
Example use cases
Pre-payment deadline guard for x402 agent
“I'm about to submit an x402 payment but want to make sure the authorization deadline at epoch 1720005000 is still valid — current time is epoch 1720003500, minimum lead is 60 seconds and maximum lead is 1800 seconds. Is this safe to proceed?”
Rejecting a stale payment challenge
“An agent handed me a payment challenge with deadline epoch 1719990000, but the current time is epoch 1720000000 with a minimum lead of 120 seconds. Can you check if the deadline has already expired before I try to pay?”
Validating far-future deadline within budget
“Check whether an x402 payment deadline at epoch 1720100000 is within my time budget — the current epoch is 1719999000, I need at least 10 seconds lead time and no more than 3600 seconds lead time.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x402-payment-deadline-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or payment orchestrator needs to deterministically validate an x402 payment authorization deadline before committing to a payment, especially when the agent has strict time budgets and needs an explicit accept/reject signal with evidence rather than computing deadline logic itself.
Side effects
- Missing required fields (now_epoch, deadline_epoch) results in validation error
- Inverted min/max lead seconds (minimum greater than maximum) may produce unexpected rejection
- Non-integer epoch values cause input schema errors
- Deadline exactly at boundary conditions may yield edge-case rejections depending on implementation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| now_epoch | integer | Now Epoch supplied to X402 Payment Deadline Check; used only for this bounded calculation and processed in memory without retention. |
| deadline_epoch | integer | Deadline Epoch supplied to X402 Payment Deadline Check; used only for this bounded calculation and processed in memory without retention. |
| maximum_lead_seconds | integer | Maximum Lead Seconds supplied to X402 Payment Deadline Check; used only for this bounded calculation and processed in memory without retention. |
| minimum_lead_seconds | integer | Minimum Lead Seconds supplied to X402 Payment Deadline Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"lead_seconds": 300,
"within_window": true,
"maximum_lead_seconds": 3600,
"minimum_lead_seconds": 30
},
"schema": "delx/util-x402-payment-deadline-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "59c678732bd73042e4f51cbf240f3f49ced22b5675207daf3f54360d261c4acb",
"external_calls": 0
},
"operation": "delivery_contract:x402_payment_deadline_check"
}
}Tags
x402
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