# Ausca Agent Inbox Extend

> Ausca Agent Inbox Extend is a paid API for AI agents from ausca.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Extends the expiration of an existing Ausca agent inbox by an additional 24 hours for a pay-per-call fee

## Facts

- Endpoint: POST https://ausca.com/v1/extend-inbox
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ausca-agent-inbox-extend-9747b864
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xOacE_6yivylGvOVo3Xr6

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 ausca-agent-inbox-extend-9747b864 -d '<json body>'
```

Example prompt: My Ausca agent inbox is about to expire — can you extend it for another day so I don't lose incoming messages?

## When to prefer this

Use this endpoint when an agent already has an active or recently active Ausca inbox and needs to prolong its lifetime without creating a new inbox or losing the existing address. Prefer this over creating a new inbox when continuity of the existing email address matters — for example, ongoing workflows that send replies to a fixed inbox address. This is purpose-built for Ausca's per-call payment model, so no account setup or provider API key is needed; just pay $0.05 USDC per extension via x402.

## Known failure modes

- Inbox ID not found or already fully expired — returns an error state rather than succeeded
- Payment of $0.05 USDC not received or insufficient — request rejected before processing
- Malformed request body or missing required fields — schema validation error
- Inbox in a non-extendable state (e.g. revoked or deleted) — extension rejected
- Network timeout or service unavailability — no modification made, safe to retry

## How this service works

Add purchased time to the current expiry of one active receive-only inbox. The same inbox id, address, messages, read/delete capability, and limits remain in place. Deleted or expired inboxes cannot be revived, and prepaid expiry cannot exceed 30 days from the extension time.

## Output

Returns a JSON object confirming the inbox extension was accepted and succeeded, including the updated inbox address, the new expiration timestamp, the previous expiration timestamp, how many additional seconds were added (86400 = 24 hours), the inbox ID, the current state (active), a verifiable receipt reference with a URI, and an output digest for verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "status": "accepted",
  "invocation": {
   "state": "succeeded",
   "output": {
    "extension": {
     "state": "active",
     "schema": "ausca.agent_inbox.extension.v1",
     "address": "inbox+0123456789abcdef0123456789abcdef01234567.89abcdef01234567@mail.ausca.com",
     "inbox_id": "inb_0123456789abcdef0123456789abcdef01234567",
     "expires_at": "2026-09-02T01:00:00.000Z",
     "extended_at": "2026-09-01T00:30:00.000Z",
     "previous_expires_at": "2026-09-01T01:00:00.000Z",
     "additional_duration_seconds": 86400
    }
   },
   "updated_at": "2026-01-01T00:00:00Z",
   "receipt_ref": {
    "uri": "runx:receipt:discovery-example",
    "type": "receipt"
   },
   "invocation_id": "ausca-discovery-example",
   "output_digest": "sha256:66004d562e7ec85c0d5cf8504ed3d87e707671db55e74c2cd90ee1b59b3a72bd",
   "offer_revision_digest": "sha256:b4273012af0e26880f49e6a52f05084d5358fc725d5a397c8f0c8d74019cc11c"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ausca-agent-inbox-extend-9747b864/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ausca.com](https://www.zero.xyz/host/ausca.com/llms.txt)