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Quote Freshness Guard
x402
Quote Freshness Guard is a paid API for AI agents from phion.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).
Validates that an x402 payment quote will remain valid long enough to survive the authorization and retry cycle before accepting it
Price / call$0.002
Success—
StatusUnknown
How this service works
Reject x402 quotes that cannot remain valid through authorization and retry
Output
A decision on whether the x402 quote is sufficiently fresh to remain valid through the authorization and retry process, along with a rejection reason if the quote fails the freshness check.
Example use cases
Pre-payment quote expiry check
“I have an x402 quote that's about to be used for a paid API call — can you verify it has enough time left on it to get through authorization and any retries before I commit to it?”
Retry-safe quote validation in agent loop
“My agent is retrying a failed x402 payment and I want to make sure the original quote is still valid before trying again — check if it's fresh enough to survive another authorization attempt.”
Batch job quote freshness gating
“I'm about to kick off a series of x402-paid calls and I need to confirm each quote is fresh enough to last through the whole authorization cycle — reject any that are too close to expiry.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/quote-freshness-guard?utm_source=zero.xyzWhen to prefer
Use this endpoint when your agent is about to submit an x402 payment and needs to confirm the quote won't expire mid-flight during authorization or retries. It is particularly valuable in retry loops, high-latency authorization chains, or any workflow where clock drift or processing delays could cause a quote to expire before payment completes.
Side effects
- Quote already expired at time of check — rejected with expiry timestamp
- Quote window too narrow for expected authorization latency — rejected with margin details
- Malformed or missing quote fields — validation error returned
- Network timeout contacting guard service — no decision returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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