# PHION Mandate Capacity Reservation

> PHION Mandate Capacity Reservation is a paid API for AI agents from phion.systems, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).

Atomically reserves cumulative mandate capacity and returns a signed state receipt for AI-agent payment mandate workflows

## Facts

- Endpoint: POST https://phion.systems/v1/paid/mandates/reserve
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phion-mandate-capacity-reservation-a7db0495
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eu-Gt8EF2tUSrBsVSrhX-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability phion-mandate-capacity-reservation-a7db0495 -d '<json body>'
```

Example prompt: Reserve cumulative mandate capacity for my agent's ongoing payment mandate and give me a signed state receipt confirming the reservation is locked in.

## When to prefer this

Use this endpoint when an AI agent needs to atomically reserve and lock spending capacity within a payment mandate before executing a transaction, especially when you need a cryptographically signed proof of reservation for audit, compliance, or downstream verification. Prefer this over generic payment initiation when the mandate's cumulative state must be tracked and the reservation must be atomic to prevent race conditions in multi-agent or multi-step commerce workflows.

## Known failure modes

- Insufficient remaining mandate capacity — reservation rejected with capacity-exceeded error
- Concurrency conflict — atomic reservation fails if another process modified mandate state simultaneously
- Invalid or expired mandate identifier — returns authorization error
- Malformed reservation parameters — returns validation error with field-level detail
- Signature generation failure — internal error preventing signed state production

## How this service works

Atomically reserve cumulative mandate capacity and return signed state

## Output

A signed state object confirming the atomic reservation of the requested mandate capacity, including cryptographic signature, reserved amount, cumulative mandate state, and a machine-readable receipt suitable for downstream verification or audit by AI agents.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/phion-mandate-capacity-reservation-a7db0495/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phion.systems](https://www.zero.xyz/host/phion.systems/llms.txt)