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Subscription Spend Guard
x402
Subscription Spend Guard is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Enforces recurring period budgets for agent subscriptions, blocking spend that exceeds defined limits within a billing cycle
Price / call$0.003
Success—
StatusUnknown
How this service works
Enforce recurring period budgets
Output
Returns an enforcement decision indicating whether the recurring spend is approved or rejected, along with the remaining budget allowance for the current period, the current cumulative spend, the period reset time, and any policy rule that triggered a rejection.
Example use cases
Monthly SaaS budget cap for agent
“My agent is about to renew a $15 SaaS subscription but I want to make sure it hasn't already blown past my $100 monthly cap for recurring tools — current spend this month is $88. Block it if it would go over.”
Per-period API subscription guardrail
“Before my agent commits to this $25 weekly API subscription renewal, verify it stays within my $75 weekly recurring budget — we've already spent $55 this week.”
Autonomous agent recurring cost control
“I need a hard stop on my agent's subscription spending — enforce a $200 per-month limit and reject any recurring charge that would push us over, given we're currently at $180 for the period.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/subscription-spend-guardWhen to prefer
Use this endpoint when an AI agent needs to enforce hard budget caps on recurring or subscription-based spending within defined billing periods. It is specifically designed for periodic/recurring cost governance rather than one-off transaction limits. Prefer this over generic payment validation when the use case involves subscription renewals, repeating charges, or cycle-based budget tracking.
Side effects
- Missing or malformed budget limit causes validation failure
- Period definition not recognized or missing results in inability to evaluate budget window
- Spend amount exceeds budget — returns rejection with overage details
- Invalid currency or currency mismatch causes processing error
- Ambiguous period boundaries (e.g. overlapping cycles) may cause indeterminate result
Input
Schema · Request body
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object"
}Tags
x402
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