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Delegated Spend Policy
x402
Delegated Spend Policy is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-20).
Enforces delegated spending mandates by failing closed on inactive mandates and blocking per-transaction or remaining-budget violations
Price / call$0.003
Success—
StatusUnknown
How this service works
Fail closed on inactive mandates and per-transaction or remaining-budget violations
Output
A policy decision indicating whether the delegated spend is permitted or denied, including the specific violation reason if the mandate is inactive, the per-transaction limit is exceeded, or the remaining budget would be breached. The response fails closed — any policy violation results in an explicit denial rather than a default allow.
Example use cases
Block overspend before agent checkout
“My shopping agent is about to place a $120 order — check its delegated mandate and make sure it hasn't already blown its remaining budget or hit its per-transaction cap before it pays.”
Enforce inactive mandate hard fail
“The agent that manages my subscriptions is trying to authorize a renewal payment, but I revoked its mandate last week — make sure the policy check catches that and blocks the spend entirely.”
Sub-agent budget guard for multi-agent workflow
“I have a fleet of sub-agents each with a $50 daily spend mandate; before any of them executes a payment, run the delegated spend policy to confirm the mandate is active and the transaction amount is within limits.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/delegated-spend-policy?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent is operating under a delegated spend authority and you need a hard, fail-closed policy check before any payment executes. It is specifically designed for agentic payment contexts where mandate lifecycle (active vs. revoked), per-transaction caps, and cumulative budget limits must all be enforced in a single policy call. Prefer it over generic authorization checks when the spend is delegated (one agent acting for another principal) and you want an explicit denial with a machine-readable violation reason rather than a soft advisory signal.
Side effects
- Mandate not found or unrecognizable — returns denial with unknown-mandate error
- Mandate is inactive or revoked — hard fail with inactive-mandate violation
- Transaction amount exceeds per-transaction limit — denial with per-transaction-violation reason
- Remaining budget insufficient for requested spend — denial with budget-exhausted reason
- Malformed or missing input fields — returns validation error
- Service unavailable — defaults to fail-closed denial to avoid unsafe fallthrough
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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