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Agent Budget Guard
x402
Agent Budget Guard is a paid API for AI agents from phion.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-27).
Enforce declared per-call, task, session, and period spending budgets before an agent executes a paid action
Price / call$0.002
Success—
StatusUnknown
How this service works
Enforce declared per-call, task, session and period budgets before execution
Output
Returns a decision indicating whether the proposed action is allowed or blocked given the declared budget constraints, along with remaining budget headroom and a reason if the action is rejected due to a budget violation.
Example use cases
Cap per-call cost in autonomous pipeline
“I'm running an autonomous research agent that makes paid API calls — make sure each individual call costs no more than $0.005 and block execution if it would exceed that per-call budget.”
Enforce session-wide spending ceiling
“My agent is doing a multi-step data enrichment session — enforce a hard $2.00 session budget and stop it from making any more paid calls once that ceiling is hit.”
Period budget guard for recurring agent tasks
“Our agent runs nightly and has a weekly allowance of $10 — check before each execution that the period budget hasn't been exhausted, and block the run if we're over limit.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/agent-budget-guard?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent is about to execute a paid action and you need a pre-flight enforcement check against one or more declared budget tiers (per-call, task, session, or period). Prefer this over ad-hoc cost checks when you need structured, policy-driven enforcement that can block execution before any payment is attempted, especially in agentic workflows where runaway spending is a risk.
Side effects
- Missing or malformed budget declarations result in rejection
- Cost estimate not provided prevents enforcement check
- Period or session context not supplied leads to incomplete validation
- Budget already exhausted returns blocked status with violation detail
- Ambiguous budget scope (per-call vs session) may require explicit disambiguation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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