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X402 Timeout Check
x402
X402 Timeout Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-21).
Validates x402 payment challenge expiration and minimum buyer processing time from caller-supplied epoch values, returning an explicit accept/reject status with normalized evidence.
Price / call$0.001
Success—
StatusUnknown
How this service works
X402 Timeout Check: X402 Timeout Check checks challenge expiration and minimum buyer processing time from bounded caller-supplied values without an external provider. Call X402 Timeout 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 Timeout Check as versioned deterministic JSON. Price: $0.001…
Output
A versioned deterministic JSON object containing an explicit acceptance or rejection status, contract-specific timeout checks, normalized evidence derived from the supplied epoch values, and the specific mismatch reasons if the challenge fails validation.
Example use cases
Pre-payment x402 challenge expiry check
“I have an x402 challenge that expires at epoch 1718003600 and I'm at epoch 1718000000 right now — verify it hasn't expired and that there's at least 60 seconds of lead time before I send the payment.”
Agent delivery timing validation
“Before my agent accepts this assembled delivery, check the timeout: current epoch is 1718001000, the challenge expires at epoch 1718001500, and the minimum buyer lead time required is 120 seconds — should I accept or reject it?”
Stale challenge rejection screening
“I need to know if this x402 challenge is still usable — current epoch is 1718005000, expires at 1718004800, minimum lead seconds is 30. Tell me if it should be accepted or rejected and why.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x402-timeout-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, stateless check of x402 challenge timing constraints before committing to a payment or accepting an agent delivery. Prefer it over manual time arithmetic when you need normalized mismatch reasons and structured accept/reject evidence as versioned JSON, particularly in agent workflows that must audit their payment decisions.
Side effects
- Missing required fields (now_epoch, expires_epoch, minimum_lead_seconds) result in validation error
- now_epoch >= expires_epoch causes immediate rejection with expiration mismatch reason
- expires_epoch - now_epoch < minimum_lead_seconds causes rejection with insufficient lead time reason
- Malformed integer types for epoch or lead values may return schema validation errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| now_epoch | integer | Now Epoch supplied to X402 Timeout Check; used only for this bounded calculation and processed in memory without retention. |
| expires_epoch | integer | Expires Epoch supplied to X402 Timeout Check; used only for this bounded calculation and processed in memory without retention. |
| minimum_lead_seconds | integer | Minimum Lead Seconds supplied to X402 Timeout 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": 9223372036854776000,
"minimum_lead_seconds": 30
},
"schema": "delx/util-x402-timeout-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "1199b0cc2c5f6a7de14c3b13bef25ae15b4a34f6c7c5ba48af83021cc95cbfac",
"external_calls": 0
},
"operation": "delivery_contract:x402_timeout_check"
}
}Tags
x402
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