# Ausca Open Inbox – Temporary Receive-Only Agent Email Address

> Ausca Open Inbox – Temporary Receive-Only Agent Email Address is a paid API for AI agents from ausca.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Creates a temporary, receive-only email inbox address for an agent, leased for 1 hour, 24 hours, or 7 days, with no account or API key required.

## Facts

- Endpoint: POST https://ausca.com/v1/open-inbox
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ausca-open-inbox-temporary-receive-only-agent-email-address-cc38564a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OiCeN1zb07Q1hgRMv4Ibj

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-open-inbox-temporary-receive-only-agent-email-address-cc38564a -d '<json body>'
```

Example prompt: Create a temporary receive-only inbox for me that lasts 24 hours so I can receive replies during this task — no account needed, just give me the address.

## When to prefer this

Choose this endpoint when an AI agent needs a short-lived, receive-only email address on demand without managing accounts, API keys, or SMTP infrastructure. It is ideal for ephemeral agent workflows where an agent must receive an email reply, confirmation, or message from an external party within a bounded time window. Prefer it over full email providers when you want pay-per-use metering, verifiable receipts, and zero credential management.

## Known failure modes

- Invalid duration_seconds value (only 3600, 86400, or 604800 accepted) — returns validation error
- Duplicate idempotency_key with different parameters — may return conflict error
- Payment failure via x402 protocol — inbox not created, no charge
- Schema digest mismatch — request rejected if canonicalizer or schema digests don't match constants
- Service unavailability — 5xx response with no lease created

## How this service works

Start one renewable random receive-only email address with 1 hour, 24 hours, or 7 days prepaid, then wait for and read bounded inbound mail. Extend the same active address when more time is needed. No outbound email or mailbox suite.

## Output

Returns a JSON object containing an active resource lease with a unique randomly-generated email address (inbox+<id>@mail.ausca.com), an inbox_id, creation and expiry timestamps, lease state, and a verifiable receipt reference tied to the payment.

## 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": {
    "resource_lease": {
     "state": "active",
     "schema": "ausca.agent_inbox.lease.v1",
     "address": "inbox+0123456789abcdef0123456789abcdef01234567.89abcdef01234567@mail.ausca.com",
     "inbox_id": "inb_0123456789abcdef0123456789abcdef01234567",
     "created_at": "2026-09-01T00:00:00Z",
     "expires_at": "2026-09-01T01:00:00Z"
    }
   },
   "updated_at": "2026-01-01T00:00:00Z",
   "receipt_ref": {
    "uri": "runx:receipt:discovery-example",
    "type": "receipt"
   },
   "invocation_id": "ausca-discovery-example",
   "output_digest": "sha256:7d53e13cbbd9b11c67b03cf6c485ab0a955c36a436ded19beda0098ae8e09227",
   "offer_revision_digest": "sha256:54bd08eb574bf24775bfa6ac0e33ae803d37bae112c148a0312ed6da8a43af43"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ausca-open-inbox-temporary-receive-only-agent-email-address-cc38564a/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)