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Agent Result Freshness Check
x402
Agent Result Freshness Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Validates whether an agent-delivered result is within an acceptable age window by comparing observation timestamp against current time and a caller-supplied maximum age budget.
Price / call$0.001
Success—
StatusUnknown
How this service works
Agent Result Freshness Check: Agent Result Freshness Check checks result observation age against a caller freshness budget from bounded caller-supplied values without an external provider. Call Agent Result Freshness 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 Agent Result Freshness Check as v…
Output
Returns a structured response containing an explicit acceptance or rejection status, contract-specific check results, normalized evidence of the age calculation, and mismatch reasons if the result falls outside the freshness budget. All computation is performed in-memory without data retention.
Example use cases
Gate x402 payment on result freshness
“I'm about to pay for an x402 agent delivery — the result was observed at epoch 1718005000, it's now epoch 1718005400, and I'll only accept results up to 600 seconds old. Check if it passes the freshness budget before I authorize payment.”
Reject stale data before pipeline continues
“Before my pipeline processes this result, verify it's not too old — observation timestamp is epoch 1718010000, current epoch is 1718010900, and the maximum age I allow is 500 seconds. Tell me if I should accept or reject it.”
Preflight freshness check for agent orchestration
“My orchestrator needs to confirm this agent output is fresh enough to use — observed_at is epoch 1718020100, now is epoch 1718020200, and I require results to be no older than 120 seconds. Does it pass?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/agent-result-freshness-checkWhen to prefer
Use this endpoint when you need a lightweight, stateless, in-memory freshness gate before accepting or paying for an agent-delivered result — especially in x402 payment flows where stale results should be rejected before funds are committed. Prefer this over custom logic when you need normalized evidence and explicit accept/reject status without external dependencies or data retention.
Side effects
- Missing required fields (now_epoch, observed_at_epoch, maximum_age_seconds) result in validation errors
- Negative or zero maximum_age_seconds may produce undefined or always-reject behavior
- now_epoch earlier than observed_at_epoch (clock skew or bad input) may yield rejection with mismatch reason
- Non-integer epoch values cause schema validation failure
- Payment failure via x402 protocol blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| now_epoch | integer | Now Epoch supplied to Agent Result Freshness Check; used only for this bounded calculation and processed in memory without retention. |
| observed_at_epoch | integer | Observed At Epoch supplied to Agent Result Freshness Check; used only for this bounded calculation and processed in memory without retention. |
| maximum_age_seconds | integer | Maximum Age Seconds supplied to Agent Result Freshness Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"fresh": true,
"age_seconds": 60
},
"schema": "delx/util-agent-result-freshness-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "988059b2da4170c5bfc7e047394f4e4a26cb307ee840337c2c752ffa3e5af0e3",
"external_calls": 0
},
"operation": "delivery_contract:agent_result_freshness_check"
}
}Tags
x402
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